657 Species of Genus Quercus

The Mighty Oak: A Personal Exploration of Quercus

The oak, a symbol of strength and longevity, has captivated me since I was a child. Growing up, I would spend countless hours exploring the woods near my home, marveling at the towering oaks that seemed to touch the sky. Their gnarled branches, covered in moss and lichen, told stories of years gone by, and the rustling of their leaves was a constant source of comfort. It was this early fascination that sparked my lifelong interest in the Quercus genus.

A Diverse Family

Quercus is a diverse genus of trees and shrubs belonging to the beech family, Fagaceae. With an estimated 657 species, oaks are found throughout the Northern Hemisphere, from the cool temperate zones to the tropical highlands. They are a keystone species in many ecosystems, providing food and shelter for a wide range of animals.

One of the things that makes Quercus so fascinating is the sheer variety within the genus. From the majestic white oak (Quercus alba) with its broad leaves and spreading crown, to the scrubby live oak (Quercus virginiana) with its evergreen foliage and gnarled branches, each species has its own unique characteristics. Some oaks, like the cork oak (Quercus suber), are even cultivated for their bark, which is used to make wine stoppers and other products.

Identifying an Oak

Identifying an oak can be a rewarding challenge. The most distinctive feature of the oak is its fruit, the acorn. These nuts are typically encased in a cupule, a cup-like structure that varies in size and shape depending on the species. The leaves of oaks are also helpful in identification. They can be lobed, toothed, or entire, and their arrangement on the twig can be alternate or clustered.

A Closer Look at Some Quercus Species

1. Quercus acatenangensis Trel.
2. Quercus acerifolia (E.J.Palmer) Stoynoff & W.J.Hess ex R.J.Jensen
3. Quercus acherdophylla Trel.
4. Quercus acrodonta Seemen
5. Quercus aculcingensis Trel.
6. Quercus acuta Thunb.
7. Quercus acutangula Trel.
8. Quercus × acutidens Torr.
9. Quercus acutifolia Née
10. Quercus acutissima Carruth.
11. Quercus aerea Trel.
12. Quercus afares Pomel
13. Quercus affinis Scheidw.
14. Quercus agrifolia Née
15. Quercus airensis Franco & Vasc.
16. Quercus ajoensis C.H.Mull.
17. Quercus alba L.
18. Quercus × albescens Rouy ex A.Camus
19. Quercus albicaulis Chun & W.C.Ko
20. Quercus albocincta Trel.
21. Quercus aliena Blume
22. Quercus × alienocrispula H.Ohba
23. Quercus × alienoserratoides T.B.Lee
24. Quercus × allorgeana A.Camus
25. Quercus × almeidae Vila-Viçosa, Capelo, P.Alves & F.M.Vázquez
26. Quercus alnifolia Poech
27. Quercus alpescens Trel.
28. Quercus × alvesii Vila-Viçosa, Capelo, R.Almeida & F.M.Vázquez
29. Quercus × alvordiana Eastw.
30. Quercus × andegavensis Hy
31. Quercus × andresii R.Alonso, Llamas, E.Puente & Penas
32. Quercus × andrewsii Sarg.
33. Quercus × anguste-lepidosa Nakai
34. Quercus annulata Sm.
35. Quercus apiculata Djav.-Khoie
36. Quercus aquifolioides Rehder & E.H.Wilson
37. Quercus arbutifolia Hickel & A.Camus
38. Quercus argentata Korth.
39. Quercus argyrotricha A.Camus
40. Quercus ariifolia Trel.
41. Quercus aristata Hook. & Arn.
42. Quercus arizonica Sarg.
43. Quercus arkansana Sarg.
44. Quercus × arrimatensis Penas, Llamas, Pérez Morales & Acedo
45. Quercus × ashei Trel.
46. Quercus asymmetrica Hickel & A.Camus
47. Quercus × atlantica Ashe
48. Quercus aucheri Jaub. & Spach
49. Quercus augustinei Skan
50. Quercus aurea Wierzb.
51. Quercus austrina Small
52. Quercus austrocochinchinensis Hickel & A.Camus
53. Quercus × autumnalis F.M.Vázquez, S.Ramos & Doncel
54. Quercus × auzendei Gren. & Godr.
55. Quercus × avellaniformis Colmeiro & E.Boutelou
56. Quercus × baenitzii A.Camus
57. Quercus baloot Griff.
58. Quercus bambusifolia Hance
59. Quercus baniensis A.Camus
60. Quercus baolamensis H.T.Binh & Ngoc
61. Quercus × barnova Georgescu & Dobrescu
62. Quercus baronii Skan
63. Quercus barrancana Spellenb.
64. Quercus × basaseachicensis C.H.Mull.
65. Quercus bawanglingensis C.C.Huang, Ze X.Li & F.W.Xing
66. Quercus × beadlei Trel. ex E.J.Palmer
67. Quercus × beaumontiana Sarg.
68. Quercus × bebbiana C.K.Schneid.
69. Quercus × beckyae Gaynor
70. Quercus × beguinotii Gavioli
71. Quercus bella Chun & Tsiang
72. Quercus × benderi Baen.
73. Quercus benthamii A.DC.
74. Quercus berberidifolia Liebm.
75. Quercus × bernardensis W.Wolf
76. Quercus bicolor Willd.
77. Quercus bidoupensis H.T.Binh & Ngoc
78. Quercus × bimundorum E.J.Palmer
79. Quercus blakei Skan
80. Quercus blaoensis A.Camus
81. Quercus × blufftonensis Trel.
82. Quercus boyntonii Beadle
83. Quercus braianensis A.Camus
84. Quercus brandegeei Goldman
85. Quercus brandisiana Kurz
86. Quercus brantii Lindl.
87. Quercus breedloveana Nixon & Barrie
88. Quercus brenesii Trel.
89. Quercus brevicalyx A.Camus
90. Quercus breviradiata (W.C.Cheng) C.C.Huang
91. Quercus × brittonii W.T.Davis
92. Quercus buckleyi Nixon & Dorr
93. Quercus × burnetensis Little
94. Quercus × bushii Sarg.
95. Quercus × byarsii Sudw. ex Trel.
96. Quercus × caduca Trel.
97. Quercus × caesariensis Moldenke
98. Quercus calophylla Schltdl. & Cham.
99. Quercus cambodiensis Hickel & A.Camus
100. Quercus × campitica Hadjik. & Hand
101. Quercus camusiae Trel. ex Hickel & A.Camus
102. Quercus canariensis Willd.
103. Quercus canbyi Trel.
104. Quercus × cantabrica C.Vicioso
105. Quercus × capeloana Vila-Viçosa, P.Alves, P.Lemos, R.Almeida & F.M.Vázquez
106. Quercus × capesii W.Wolf
107. Quercus carduchorum K.Koch
108. Quercus carmenensis C.H.Mull.
109. Quercus × carrissoana A.Camus
110. Quercus castanea Née
111. Quercus castaneifolia C.A.Mey.
112. Quercus × cazanensis Pasc.
113. Quercus cedrosensis C.H.Mull.
114. Quercus × celtica F.M.Vázquez, Coombes, Rodr.-Coombes, S.Ramos & Doncel
115. Quercus centenaria L.M.González
116. Quercus × cerrioides Willk. & Costa
117. Quercus cerris L.
118. Quercus championii Benth.
119. Quercus changhualingensis (G.A.Fu & X.J.Hong) N.H.Xia & Y.H.Tong
120. Quercus chapmanii Sarg.
121. Quercus charcasana Trel. ex A.Camus
122. Quercus chartacea Trel.
123. Quercus chenii Nakai
124. Quercus chevalieri Hickel & A.Camus
125. Quercus chihuahuensis Trel.
126. Quercus chimaltenangana Trel.
127. Quercus chrysocalyx Hickel & A.Camus
128. Quercus chrysolepis Liebm.
129. Quercus × chrysopoda Borbás
130. Quercus chrysotricha A.Camus
131. Quercus chungii F.P.Metcalf
132. Quercus ciliaris C.C.Huang & Y.T.Chang
133. Quercus coahuilensis Nixon & C.H.Mull.
134. Quercus coccifera L.
135. Quercus cocciferoides Hand.-Mazz.
136. Quercus coccinea Münchh.
137. Quercus × cocksii Sarg.
138. Quercus coffeicolor Trel.
139. Quercus × columnaris Laughlin
140. Quercus × comptoniae Sarg.
141. Quercus conduplicans Chun
142. Quercus confertifolia Bonpl.
143. Quercus congesta C.Presl
144. Quercus convallata Trel.
145. Quercus conzattii Trel.
146. Quercus copeyensis C.H.Mull.
147. Quercus cornelius-mulleri Nixon & K.P.Steele
148. Quercus corrugata Hook.
149. Quercus cortesii Liebm.
150. Quercus × coscojosuberiformis Baonza
151. Quercus costaricensis Liebm.
152. Quercus × coutinhoi Samp.
153. Quercus crassifolia Bonpl.
154. Quercus crassipes Bonpl.
155. Quercus × cravenensis Little
156. Quercus crispifolia Trel.
157. Quercus crispipilis Trel.
158. Quercus cualensis L.M.González
159. Quercus daimingshanensis (S.K.Lee) C.C.Huang
160. Quercus dalechampii Ten.
161. Quercus dankiaensis A.Camus
162. Quercus × deamii Trel.
163. Quercus delavayi Franch.
164. Quercus × deleiensis A.Camus
165. Quercus delgadoana S.Valencia, Nixon & L.M.Kelly
166. Quercus delicatula Chun & Tsiang
167. Quercus deliquescens C.H.Mull.
168. Quercus × demareei Ashe
169. Quercus dentata Thunb.
170. Quercus depressa Bonpl.
171. Quercus depressipes Trel.
172. Quercus deserticola Trel.
173. Quercus devia Goldman
174. Quercus × diegoi F.M.Vázquez, Pinto Gomes, Vinagre & Vila-Viçosa
175. Quercus dilacerata Hickel & A.Camus
176. Quercus dinghuensis C.C.Huang
177. Quercus × diosdadoi F.M.Vázquez, Coombes, Rodr.-Coombes, S.Ramos & Doncel
178. Quercus disciformis Chun & Tsiang
179. Quercus × discreta Laughlin
180. Quercus diversifolia Née
181. Quercus × diversiloba Tharp ex A.Camus
182. Quercus dolicholepis A.Camus
183. Quercus dongfangensis C.C.Huang, F.W.Xing & Ze X.Li
184. Quercus donnaiensis A.Camus
185. Quercus douglasii Hook. & Arn.
186. Quercus × drummondii Liebm.
187. Quercus dumosa Nutt.
188. Quercus durata Jeps.
189. Quercus × duriensis (Franco & Vasc.) Vila-Viçosa, Capelo, P.Alves, R.Almeida & F.M.Vázquez
190. Quercus durifolia Seemen
191. Quercus × dysophylla Benth.
192. Quercus × eborense Vila-Viçosa, Capelo, P.Alves, J.Junqueira, R.Almeida & F.M.V
193. Quercus edithiae Skan
194. Quercus eduardi Trel.
195. Quercus edwardsiae C.H.Mull.
196. Quercus × egglestonii Trel.
197. Quercus elevaticostata (Q.F.Zheng) C.C.Huang
198. Quercus ellipsoidalis E.J.Hill
199. Quercus elliptica Née
200. Quercus elmeri Merr.
201. Quercus emoryi Torr.
202. Quercus engelmannii Greene
203. Quercus engleriana Seemen
204. Quercus × eplingii C.H.Mull.
205. Quercus estremadurensis O.Schwarz
206. Quercus eugeniifolia Liebm.
207. Quercus eumorpha Kurz
208. Quercus × ewanii I.M.Turner
209. Quercus × exacta Trel.
210. Quercus fabri Hance
211. Quercus faginea Lam.
212. Quercus falcata Michx.
213. Quercus × fangshanensis Liou
214. Quercus × faxonii Trel.
215. Quercus × fernaldii Trel.
216. Quercus × fernowii Trel.
217. Quercus × filialis Little
218. Quercus fimbriata Y.C.Hsu & H.Wei Jen
219. Quercus × firmurensis Hy
220. Quercus floccosa Liebm.
221. Quercus flocculenta C.H.Mull.
222. Quercus floribunda Lindl. ex A.Camus
223. Quercus × fontana Laughlin
224. Quercus × fontanesii Guss.
225. Quercus × fontqueri O.Schwarz
226. Quercus frainetto Ten.
227. Quercus franchetii Skan
228. Quercus frutex Trel.
229. Quercus fuliginosa Chun & W.C.Ko
230. Quercus fulva Liebm.
231. Quercus furfuracea Liebm.
232. Quercus fusiformis Small
233. Quercus gaharuensis Soepadmo
234. Quercus galeanensis C.H.Mull.
235. Quercus × gallaecica Llamas, Lence & Acedo
236. Quercus gambelii Nutt.
237. Quercus gambleana A.Camus
238. Quercus × ganderi C.B.Wolf
239. Quercus × garlandensis E.J.Palmer
240. Quercus garryana Douglas ex Hook.
241. Quercus gemelliflora Blume
242. Quercus geminata Small
243. Quercus georgiana M.A.Curtis
244. Quercus germana Schltdl. & Cham.
245. Quercus ghiesbreghtii M.Martens & Galeotti
246. Quercus × giffordii Trel.
247. Quercus gilliana Rehder & E.H.Wilson
248. Quercus gilva Blume
249. Quercus glabrescens Benth.
250. Quercus glauca Thunb.
251. Quercus glaucescens Bonpl.
252. Quercus glaucoides M.Martens & Galeotti
253. Quercus gomeziana A.Camus
254. Quercus gracilenta Chun
255. Quercus graciliformis C.H.Mull.
256. Quercus gracilior C.H.Mull.
257. Quercus grahamii Benth.
258. Quercus gravesii Sudw.
259. Quercus greggii (A.DC.) Trel.
260. Quercus griffithii Hook.f. & Thomson ex Miq.
261. Quercus grisea Liebm.
262. Quercus × guadalupensis Sarg.
263. Quercus gulielmi-treleasei C.H.Mull.
264. Quercus gussonei (Borzì) Brullo
265. Quercus guyavifolia H.Lév.
266. Quercus handeliana A.Camus
267. Quercus × harbisonii Sarg.
268. Quercus hartwissiana Steven
269. Quercus × hastingsii Sarg.
270. Quercus havardii Rydb.
271. Quercus × hawkinsiae Sudw.
272. Quercus × haynaldiana Simonk.
273. Quercus helferiana A.DC.
274. Quercus × helvetica Thell.
275. Quercus hemisphaerica W.Bartram ex Willd.
276. Quercus × heterophylla F.Michx.
277. Quercus × hillii Trel.
278. Quercus hinckleyi C.H.Mull.
279. Quercus hintonii E.F.Warb.
280. Quercus hintoniorum Nixon & C.H.Mull.
281. Quercus hirtifolia M.L.Vázquez, S.Valencia & Nixon
282. Quercus × hispanica Lam.
283. Quercus honbaensis H.T.Binh, Tagane & Yahara
284. Quercus hondae Makino
285. Quercus × hopeiensis Liou
286. Quercus × howellii J.M.Tucker
287. Quercus hui Chun
288. Quercus huicholensis R.A.McCauley
289. Quercus humboldtii Bonpl.
290. Quercus × humidicola E.J.Palmer
291. Quercus hypargyrea (Seemen ex Diels) C.C.Huang & Y.T.Chang
292. Quercus hypoleucoides A.Camus
293. Quercus hypophaea Hayata
294. Quercus hypoxantha Trel.
295. Quercus ichnusae Mossa, Bacch. & Brullo
296. Quercus ignaciensis C.H.Mull.
297. Quercus ilex L.
298. Quercus ilicifolia Wangenh.
299. Quercus iltisii L.M.González
300. Quercus imbricaria Michx.
301. Quercus incana W.Bartram
302. Quercus × incomita E.J.Palmer
303. Quercus × inconstans E.J.Palmer
304. Quercus infectoria G.Olivier
305. Quercus inopina Ashe
306. Quercus insignis M.Martens & Galeotti
307. Quercus intricata Trel.
308. Quercus × introgressa P.M.Thomson
309. Quercus invaginata Trel.
310. Quercus ithaburensis Decne.
311. Quercus × jackiana C.K.Schneid.
312. Quercus jenseniana Hand.-Mazz.
313. Quercus jinpinensis (Y.C.Hsu & H.Wei Jen) C.C.Huang
314. Quercus john-tuckeri Nixon & C.H.Mull.
315. Quercus × jolonensis Sarg.
316. Quercus jonesii Trel.
317. Quercus × joorii Trel.
318. Quercus juergensenii Liebm.
319. Quercus kelloggii Newb.
320. Quercus kerangasensis Soepadmo
321. Quercus × kerneri Simonk.
322. Quercus kerrii Craib
323. Quercus kinabaluensis Soepadmo
324. Quercus kingiana Craib
325. Quercus × kinseliae (C.H.Mull.) Nixon & C.H.Mull.
326. Quercus kiukiangensis (Y.T.Chang) Y.T.Chang
327. Quercus × kiusiana (Nakai) H.Ohba
328. Quercus × knoblochii C.H.Mull.
329. Quercus kongshanensis Y.C.Hsu & H.Wei Jen
330. Quercus kotschyana O.Schwarz
331. Quercus kouangsiensis A.Camus
332. Quercus laceyi Small
333. Quercus laeta Liebm.
334. Quercus laevis Walter
335. Quercus lamellosa Sm.
336. Quercus lanata Sm.
337. Quercus lancifolia Schltdl. & Cham.
338. Quercus langbianensis Hickel & A.Camus
339. Quercus laurifolia Michx.
340. Quercus laurina Bonpl.
341. Quercus × leana Nutt.
342. Quercus lenticellata Barnett
343. Quercus leucotrichophora A.Camus
344. Quercus liaoi C.F.Shen
345. Quercus libani G.Olivier
346. Quercus liboensis Z.K.Zhou
347. Quercus liebmannii Oerst. ex Trel.
348. Quercus lineata Blume
349. Quercus litseoides Dunn
350. Quercus lobata Née
351. Quercus lobbii Hook.f. & Thomson ex Ettingsh.
352. Quercus lodicosa O.E.Warb. & E.F.Warb.
353. Quercus longinux Hayata
354. Quercus longispica (Hand.-Mazz.) A.Camus
355. Quercus look Kotschy
356. Quercus × lousae Vila-Viçosa, F.M.Vázquez, Meireles & Pinto Gomes
357. Quercus lowii King
358. Quercus × lucana Gavioli
359. Quercus × ludoviciana Sarg.
360. Quercus lungmaiensis (Hu) C.C.Huang & Y.T.Chang
361. Quercus lusitanica Lam.
362. Quercus lyrata Walter
363. Quercus × maccormickoserrata T.B.Lee
364. Quercus × macdonaldii Greene & Kellogg
365. Quercus macdougallii Martínez
366. Quercus × macnabiana Sudw.
367. Quercus macranthera Fisch. & C.A.Mey. ex Hohen.
368. Quercus macrocalyx Hickel & A.Camus
369. Quercus macrocarpa Michx.
370. Quercus magnoliifolia Née
371. Quercus magnosquamata Djav.-Khoie
372. Quercus mangdenensis H.T.Binh & Ngoc
373. Quercus × mannifera Lindl.
374. Quercus manzanillana Trel.
375. Quercus margaretta (Ashe) Small
376. Quercus marilandica (L.) Münchh.
377. Quercus marlipoensis Hu & W.C.Cheng
378. Quercus martinezii C.H.Mull.
379. Quercus × mccormickii Carruth.
380. Quercus mcvaughii Spellenb.
381. Quercus meavei Valencia-A, Sabas & O.J.Soto
382. Quercus × megaleia Laughlin
383. Quercus meihuashanensis (Q.F.Zheng) C.C.Huang
384. Quercus melissae Nixon & Barrie
385. Quercus × mellichampii Trel.
386. Quercus merrillii Seemen
387. Quercus mespilifolia Wall. ex A.DC.
388. Quercus mexiae L.M.González
389. Quercus mexicana Bonpl.
390. Quercus michauxii Nutt.
391. Quercus microphylla Née
392. Quercus minima (Sarg.) Small
393. Quercus miquihuanensis Nixon & C.H.Mull.
394. Quercus miyagii Koidz.
395. Quercus × mohlenbrockii P.M.Thomson
396. Quercus mohriana Buckley ex Rydb.
397. Quercus mongolica Fisch. ex Ledeb.
398. Quercus monimotricha (Hand.-Mazz.) Hand.-Mazz.
399. Quercus monnula Y.C.Hsu & H.Wei Jen
400. Quercus montana Willd.
401. Quercus × morehus Kellogg
402. Quercus morii Hayata
403. Quercus × morisii Borzì
404. Quercus motuoensis C.C.Huang
405. Quercus × moultonensis Ashe
406. Quercus muehlenbergii Engelm.
407. Quercus mulleri Martínez
408. Quercus × munzii J.M.Tucker
409. Quercus × mutabilis E.J.Palmer & Steyerm.
410. Quercus myrsinifolia Blume
411. Quercus myrtifolia Willd.
412. Quercus × neopalmeri Sudw.
413. Quercus neoplatyphylla A.Camus
414. Quercus × neotharpii A.Camus
415. Quercus ngochoaensis H.T.Binh & T.S.Hoang
416. Quercus nigra L.
417. Quercus ningangensis (W.C.Cheng & Y.C.Hsu) C.C.Huang
418. Quercus ningqiangensis S.Z.Qu & W.H.Zhang
419. Quercus × nipponica Koidz.
420. Quercus nivea King
421. Quercus nixoniana S.Valencia & Lozada-Pérez
422. Quercus × numantina Ceballos & C.Vicioso
423. Quercus × numidica Trab.
424. Quercus obconicus Z.K.Zhou
425. Quercus oblongifolia Torr.
426. Quercus obtusanthera Trel.
427. Quercus obtusata Bonpl.
428. Quercus oglethorpensis W.H.Duncan
429. Quercus oidocarpa Korth.
430. Quercus oleoides Schltdl. & Cham.
431. Quercus oocarpa Liebm.
432. Quercus opaca Trel.
433. Quercus ophiosquamata Djav.-Khoie
434. Quercus × ordenensis F.M.Vázquez, Garcia Alonso & F.Márq.
435. Quercus × organensis Trel.
436. Quercus orocantabrica Rivas Mart., Penas, T.E.Díaz & Llamas
437. Quercus × oviedoensis Sarg.
438. Quercus oxyodon Miq.
439. Quercus oxyphylla (E.H.Wilson) Hand.-Mazz.
440. Quercus × pachucana Zav.-Cháv.
441. Quercus pachyloma Seemen
442. Quercus pacifica Nixon & C.H.Mull.
443. Quercus pagoda Raf.
444. Quercus × palaeolithicola Trel.
445. Quercus palmeri (Engelm.) Engelm.
446. Quercus × palmeriana A.Camus
447. Quercus palustris Münchh.
448. Quercus panamandinaea C.H.Mull.
449. Quercus pannosa Hand.-Mazz.
450. Quercus × parkeri A.Camus
451. Quercus parvula Greene
452. Quercus × pastorae M.A.Pineda, F.M.Vázquez & Sánchez Gullón
453. Quercus × pastorensis C.H.Mull.
454. Quercus pauciradiata Penas, Llamas, Pérez Morales & Acedo
455. Quercus × paui C.Vicioso
456. Quercus paxtalensis C.H.Mull.
457. Quercus peduncularis Née
458. Quercus peninsularis Trel.
459. Quercus pennivenia Trel.
460. Quercus pentacycla Y.T.Chang
461. Quercus percoriacea Soepadmo
462. Quercus perpallida Trel.
463. Quercus persica Jaub. & Spach
464. Quercus petelotii A.Camus
465. Quercus petraea (Matt.) Liebl.
466. Quercus phanera Chun
467. Quercus phellos L.
468. Quercus phillyreoides A.Gray
469. Quercus pinbianensis (Y.C.Hsu & H.Wei Jen) C.C.Huang & Y.T.Chang
470. Quercus pinnativenulosa C.H.Mull.
471. Quercus planipocula Trel.
472. Quercus platycalyx Hickel & A.Camus
473. Quercus × podophylla Trel.
474. Quercus poilanei Hickel & A.Camus
475. Quercus polymorpha Schltdl. & Cham.
476. Quercus × pongtungensis Uyeki
477. Quercus pontica K.Koch
478. Quercus porphyrogenita Trel.
479. Quercus potosina Trel.
480. Quercus praeco Trel.
481. Quercus × prasina Pers.
482. Quercus pringlei Seemen
483. Quercus prinoides Willd.
484. Quercus protoroburoides Donchev & Bouzov ex Tashev & Tsavkov
485. Quercus × pseudinfectoria A.Camus
486. Quercus pseudococcifera Desf.
487. Quercus × pseudodalechampii Cretz.
488. Quercus pseudosetulosa Q.S.Li & T.Y.Tu
489. Quercus pseudoverticillata Soepadmo
490. Quercus pubescens Willd.
491. Quercus × puentei Rivas Mart., T.E.Díaz, Penas, del Río, L.Herrero & R.Álvarez
492. Quercus pumila Walter
493. Quercus pungens Liebm.
494. Quercus purulhana Trel.
495. Quercus pyrenaica Willd.
496. Quercus quangtriensis Hickel & A.Camus
497. Quercus radiata Trel.
498. Quercus ramsbottomii A.Camus
499. Quercus × rechingeri O.Schwarz
500. Quercus × rehderi Trel.
501. Quercus rehderiana Hand.-Mazz.
502. Quercus rekonis Trel.
503. Quercus repanda Bonpl.
504. Quercus resinosa Liebm.
505. Quercus rex Hemsl.
506. Quercus × riparia Laughlin
507. Quercus × robbinsii Trel.
508. Quercus robur L.
509. Quercus robusta C.H.Mull.
510. Quercus × rolfsii Small
511. Quercus × rosacea Bechst.
512. Quercus × rotensis Penas, Llamas, Pérez Morales & Acedo
513. Quercus rotundifolia Lam.
514. Quercus rubra L.
515. Quercus rubramenta Trel.
516. Quercus × rudkinii Britton
517. Quercus rugosa Née
518. Quercus × runcinata (A.DC.) Engelm.
519. Quercus runcinatifolia Trel. & C.H.Mull.
520. Quercus rupestris Hickel & A.Camus
521. Quercus rysophylla Weath.
522. Quercus sadleriana R.Br.ter
523. Quercus saei Djav.-Khoie
524. Quercus sagraeana Nutt.
525. Quercus × salcedoi C.Vicioso
526. Quercus salicifolia Née
527. Quercus salicina Blume
528. Quercus saltillensis Trel.
529. Quercus × sampaioana Vila-Viçosa, Capelo, P.Alves, R.Almeida & F.M.Vázquez
530. Quercus sanchezcolinii Martínez
531. Quercus sapotifolia Liebm.
532. Quercus sarahmariae Nixon & Barrie
533. Quercus saravanensis A.Camus
534. Quercus sartorii Liebm.
535. Quercus × saulii C.K.Schneid.
536. Quercus × schneideri Vierh.
537. Quercus × schochiana Dieck
538. Quercus schottkyana Rehder & E.H.Wilson
539. Quercus × schuettei Trel.
540. Quercus schultzei Trel.
541. Quercus scytophylla Liebm.
542. Quercus sebifera Trel.
543. Quercus seemannii Liebm.
544. Quercus segoviensis Liebm.
545. Quercus semecarpifolia Sm.
546. Quercus semiserrata Roxb.
547. Quercus semiserratoides (Y.C.Hsu & H.Wei Jen) C.C.Huang & Y.T.Chang
548. Quercus senescens Hand.-Mazz.
549. Quercus × senneniana A.Camus
550. Quercus serrata Murray
551. Quercus sessilifolia Blume
552. Quercus setulosa Hickel & A.Camus
553. Quercus shangxiensis Z.K.Zhou
554. Quercus shennongii C.C.Huang & S.H.Fu
555. Quercus shingjenensis Y.T.Chang
556. Quercus shumardii Buckley
557. Quercus sichourensis (Y.C.Hsu) C.C.Huang & Y.T.Chang
558. Quercus sideroxyla Bonpl.
559. Quercus similis Ashe
560. Quercus sinuata Walter
561. Quercus skinneri Benth.
562. Quercus × smallii Trel.
563. Quercus sontraensis Ngoc, H.T.Binh & Son
564. Quercus sororia Liebm.
565. Quercus spinosa David
566. Quercus steenisii Soepadmo
567. Quercus stellata Wangenh.
568. Quercus × stelloides E.J.Palmer
569. Quercus stenophylloides Hayata
570. Quercus × sterilis Trel.
571. Quercus × sternbergii Lübbert ex Lamant & Coombes
572. Quercus × sterrettii Trel.
573. Quercus stewardiana A.Camus
574. Quercus × streimii Heuff.
575. Quercus striatula Trel.
576. Quercus × subconvexa J.M.Tucker
577. Quercus suber L.
578. Quercus × subintegra (Engelm.) Trel.
579. Quercus subsericea A.Camus
580. Quercus subspathulata Trel.
581. Quercus × substellata Trel.
582. Quercus × succulenta Small
583. Quercus sumatrana Soepadmo
584. Quercus supranitida C.H.Mull.
585. Quercus × szechenyiana Borbás
586. Quercus × tabajdiana Simonk.
587. Quercus × takaoyamensis Makino
588. Quercus tarahumara Spellenb., J.R.Bacon & Breedlove
589. Quercus tardifolia C.H.Mull.
590. Quercus tarokoensis Hayata
591. Quercus tatakaensis Tomiya
592. Quercus × tavaresii Samp.
593. Quercus texana Buckley
594. Quercus × tharpii C.H.Mull.
595. Quercus thomsoniana A.DC.
596. Quercus thorelii Hickel & A.Camus
597. Quercus tiaoloshanica Chun & W.C.Ko
598. Quercus × tingitana A.Camus
599. Quercus tinkhamii C.H.Mull.
600. Quercus × tlemcenensis Trab.
601. Quercus tomentella Engelm.
602. Quercus tomentosinervis (Y.C.Hsu & H.Wei Jen) C.C.Huang
603. Quercus tonduzii Seemen
604. Quercus × tottenii Melvin
605. Quercus toumeyi Sarg.
606. Quercus × townei E.J.Palmer
607. Quercus toxicodendrifolia Trel.
608. Quercus × trabutii Hy
609. Quercus treubiana Seemen
610. Quercus × tridentata Engelm. ex A.DC.
611. Quercus trojana Webb
612. Quercus trungkhanhensis H.T.Binh & Ngoc
613. Quercus tsinglingensis S.L.Liou ex S.Z.Qu & W.H.Zhang
614. Quercus tuberculata Liebm.
615. Quercus tuitensis L.M.González
616. Quercus tungmaiensis Y.T.Chang
617. Quercus turbinella Greene
618. Quercus × turneri Willd.
619. Quercus undata Trel.
620. Quercus × undulata Torr.
621. Quercus ungeri Kotschy
622. Quercus × urartensis Uribe-Ech.
623. Quercus urbani Trel.
624. Quercus × urticifolia Blume
625. Quercus utilis Hu & W.C.Cheng
626. Quercus uxoris McVaugh
627. Quercus vacciniifolia Hittell
628. Quercus × vaga E.J.Palmer & Steyerm.
629. Quercus valdinervosa Soepadmo
630. Quercus vallicola Trel.
631. Quercus variabilis Blume
632. Quercus vaseyana Buckley
633. Quercus velutina Lam.
634. Quercus verde C.H.Mull.
635. Quercus vestita Griff.
636. Quercus vicentensis Trel.
637. Quercus viminea Trel.
638. Quercus virginiana Mill.
639. Quercus × voigtii P.M.Thomson
640. Quercus vulcanica Boiss. & Heldr. ex Kotschy
641. Quercus × wagneri Gaynor
642. Quercus × walteriana Ashe
643. Quercus welshii R.A.Denham
644. Quercus × welwitschii Samp.
645. Quercus × willdenowiana (Dippel) Zabel
646. Quercus wislizeni A.DC.
647. Quercus wutaishanica Mayr
648. Quercus xalapensis Bonpl.
649. Quercus xanthoclada Drake
650. Quercus xanthotricha A.Camus
651. Quercus xuanlienensis H.T.Binh, Ngoc & T.N.Bon
652. Quercus xylina Scheidw.
653. Quercus yanqianii (G.A.Fu) N.H.Xia & Y.H.Tong
654. Quercus yiwuensis Y.C.Hsu & H.Wei Jen
655. Quercus × yokohamensis (Makino) Makino ex H.Ohba
656. Quercus yonganensis L.K.Ling & C.C.Huang
657. Quercus yongchunana Z.K.Zhou

The Importance of Oaks

Oaks play a vital role in the environment. Their acorns are a valuable food source for many animals, including squirrels, deer, and birds. Their leaves provide shade and shelter, and their roots help to stabilize the soil. Oaks are also important to humans. Their wood is strong and durable, making it ideal for construction, furniture, and flooring.

Facing the Future

Despite their strength and resilience, oaks are facing a number of threats. Climate change, habitat loss, and pests and diseases are all taking a toll on these magnificent trees. It is crucial that we take steps to protect and conserve oaks for future generations.

By planting trees, supporting conservation efforts, and educating others about the importance of oaks, we can all help to ensure that these magnificent trees continue to thrive for centuries to come. I believe that by understanding and appreciating the Quercus genus, we can deepen our connection to the natural world and inspire a sense of wonder and respect for these remarkable trees.