5. Quercus yunnanensis Franchet, J. Bot. (Morot). 13: 146. 1899.
云南波罗栎 yun nan bo luo li
Quercus dentata Thunberg var. oxyloba Franchet; Q. dentata subsp. yunnanensis (Franchet) Menitsky; Q. dentatoides Liou; Q. griffithii J. D. Hooker & Thomson ex Miquel var. urticifolia Franchet; Q. malacotricha A. Camus; Q. yui Liou.
Trees to 20 m tall, deciduous. Branchlets sulcate, densely yellowish brown stellate tomentose, lenticellate. Petiole ca. 4-8 mm, densely yellowish brown tomentose; leaf blade elliptic to broadly obovate, (8-)12-25 × (3-)6-20 cm, densely yellowish brown stellate tomentose, base cuneate to narrowly rounded, margin with 8-10 large serrations on each side, apex shortly acuminate; secondary veins 8-13 on each side of midvein. Female inflorescences borne on apical portion of shoot, 2-4 cm; cupules usually 1-3. Cupule campanulate, (0.5-)1.5-1.8 × 1-2.5 cm, enclosing 1/3-2/3 of nut; bracts yellowish gray to brown, narrowly lanceolate to narrowly ovate, 2.5-8 mm, erect or prostrate, leathery, abaxially with gray filiform hairs. Nut ovoid, 1.5-2 × 1-1.5 cm; stylopodium ca. 3 mm. Fl. Mar-Apr, fr. Sep-Oct.
* Broad-leaved and mixed mesophytic forests; 1000-2800 m. Guangdong, Guangxi, Guizhou, W Hubei, Sichuan, Yunnan
Very close to Quercus dentata; the slightly shorter cupule bract length of Q. yunnanensis is the only difference between them, and they could be treated as conspecific.