Quercus rex

{{Short description|Species of oak tree}}

{{Speciesbox

| image = Quercus rex kz03.jpg

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn | author = Carrero, C. | title = Quercus rex | page = e.T32396A2817544 | year = 2019 | access-date = 24 January 2023}}

| genus = Quercus

| display_parents = 2

| parent = Quercus sect. Cyclobalanopsis

| species = rex

| authority = Hemsl.

| synonyms_ref = [http://www.theplantlist.org/tpl1.1/record/kew-174723 The Plant List, Quercus rex Hemsl. ]

| synonyms = *Cyclobalanopsis fructiseptata (A.Camus) Hjelmq.

• Cyclobalanopsis rex (Hemsl.) Schottky
• Quercus dussaudii Hickel & A.Camus
• Quercus fructiseptata A.Camus
• Quercus subumbilicata A.Camus

}}

Quercus rex is an Asian species of tree in the family Fagaceae. It has been found in the seasonal tropical forests of northern Indochina (Laos, Myanmar, Vietnam), northeastern India, and also in the province of Yunnan in southwestern China.[http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=210000402 Flora of China, Cyclobalanopsis rex (Hemsley) Schottky, 1912. 大果青冈 da guo qing gang ] It is placed in subgenus Cerris, section Cyclobalanopsis.{{Cite web |last1=Denk |first1=Thomas |last2=Grimm |first2=Guido W. |last3=Manos |first3=Paul S. |last4=Deng |first4=Min |last5=Hipp |first5=Andrew L. |date=2017 |title=Appendix 2.1: An updated infrageneric classification of the oaks |website=figshare |doi=10.6084/m9.figshare.5547622.v1 |url=https://figshare.com/articles/dataset/Appendix_2_1_________An_updated_infrageneric_classification_of_the_oaks/5547622/1 |access-date=2023-02-24 |format=xls |name-list-style=amp }}

Quercus rex is a large tree up to 30 m. tall. Twigs are pale brown with a woolly coating of hairs. Leaves can be as much as 270 mm long.[https://www.biodiversitylibrary.org/page/16516852#page/150/mode/1up Hemsley, William Botting 1900. Hooker's Icones Plantarum 27(3): plate 2663 and subsequent unnumbered text page] 2- page fold-out line drawing, description in Latin, commentary and figure captions in English The acorn is oblate, 25-35 × 35–50 mm, pale greyish-orange and tomentose when young; the apex is rounded to impressed; the scar is 20–25 mm in diameter and depressed. In China, flowering is in April–May, acorns are found from October–November.