灰背栎Quercus senescens Hand.-Mazz.
灰背栎Quercus senescens Hand.-Mazz.
27. 灰背栎（中国高等植物图鉴）灰背高山栎
Quercus senescens Hand. -Mazz. Symb. Sin. 7: 37. 1929; A. Camus, Chenes 1: 382. 1936-38, Atlas 1. Pl. 34. f. 9-15. 1934; 中国高等植物图鉴1: 450.图899. 1972; Y. C. Hsu et H. W. Jen in Acta Phytotax. Sin. 14(2): 81. 1976; 贵州植物志1: 113. 1982; 西藏植物志1: 495. 1983; 中国树木志2: 2346. 1985.
《Flora of China》 Vol. 4 (1999)
Quercus senescens Handel-Mazzetti
灰背栎 hui bei li
Trees or shrubs to 15 m tall. evergreen. Young branchlets densely yellowish grayish brown stellate tomentose, somewhat glabrescent but with a persistent brown indumentum. Petiole 2-4 mm, densely yellowish grayish brown stellate tomentose, glabrescent; leaf blade oblong to obovate-elliptic, (2.5-)3-5(-8) × 1.2-2.5(-4.5) cm, when young densely with pale grayish brown non-glandular fascicled hairs and fascicled hairs on short stalks, abaxially with pale grayish brown fascicled hairs, adaxially glabrescent but base of fascicled hairs remaining evident (under a hand lens), base rounded to shallowly cordate, margin entire or with spiniform teeth, apex obtuse; secondary veins 6-10 on each side of midvein; tertiary veins abaxially obscure under thick indumentum. Infructescence ca. 1 cm, rachis densely pale grayish brown tomentose, glabrescent. Cupule cupular, 5-8 × 7-15 mm, enclosing ca. 1/2 of nut; bracts triangular, ca. 1 mm, crowded, gray tomentose. Nut ovoid, 1.2-1.8 × 0.8-1.1 cm, glabrous; scar 4-5 mm in diam., raised; stylopodium ca. 1 mm in diam. Fl. Apr-May, fr. Sep-Oct.
* 1900-3300 m. Guizhou, Sichuan, Xizang, Yunnan
Quercus muliensis Hu (Acta Phytotax. Sin. 1: 147. 1951), from Sichuan (Muli Zangzi Zizhixian), is probably a hybrid between Q. senescens and Q. monimotricha. It has also been treated as Q. senescens var. muliensis (Hu) Y. C. Hsu & H. W. Jen (J. Beijing Forest. Univ. 15(4): 44. 1993). Quercus muliensis has the growth habit and leaf dimensions characteristic of Q. monimotricha but the leaf and branchlet indumentum characteristic of Q. senescens.
别名：灰背高山栎;灰背山栎;
科名：壳斗科 Fagaceae
属名：栎属 Quercus
27. 灰背栎（中国高等植物图鉴）灰背高山栎
Quercus senescens Hand. -Mazz. Symb. Sin. 7: 37. 1929; A. Camus, Chenes 1: 382. 1936-38, Atlas 1. Pl. 34. f. 9-15. 1934; 中国高等植物图鉴1: 450.图899. 1972; Y. C. Hsu et H. W. Jen in Acta Phytotax. Sin. 14(2): 81. 1976; 贵州植物志1: 113. 1982; 西藏植物志1: 495. 1983; 中国树木志2: 2346. 1985.
《Flora of China》 Vol. 4 (1999)
Quercus senescens Handel-Mazzetti
灰背栎 hui bei li
Trees or shrubs to 15 m tall. evergreen. Young branchlets densely yellowish grayish brown stellate tomentose, somewhat glabrescent but with a persistent brown indumentum. Petiole 2-4 mm, densely yellowish grayish brown stellate tomentose, glabrescent; leaf blade oblong to obovate-elliptic, (2.5-)3-5(-8) × 1.2-2.5(-4.5) cm, when young densely with pale grayish brown non-glandular fascicled hairs and fascicled hairs on short stalks, abaxially with pale grayish brown fascicled hairs, adaxially glabrescent but base of fascicled hairs remaining evident (under a hand lens), base rounded to shallowly cordate, margin entire or with spiniform teeth, apex obtuse; secondary veins 6-10 on each side of midvein; tertiary veins abaxially obscure under thick indumentum. Infructescence ca. 1 cm, rachis densely pale grayish brown tomentose, glabrescent. Cupule cupular, 5-8 × 7-15 mm, enclosing ca. 1/2 of nut; bracts triangular, ca. 1 mm, crowded, gray tomentose. Nut ovoid, 1.2-1.8 × 0.8-1.1 cm, glabrous; scar 4-5 mm in diam., raised; stylopodium ca. 1 mm in diam. Fl. Apr-May, fr. Sep-Oct.
* 1900-3300 m. Guizhou, Sichuan, Xizang, Yunnan
Quercus muliensis Hu (Acta Phytotax. Sin. 1: 147. 1951), from Sichuan (Muli Zangzi Zizhixian), is probably a hybrid between Q. senescens and Q. monimotricha. It has also been treated as Q. senescens var. muliensis (Hu) Y. C. Hsu & H. W. Jen (J. Beijing Forest. Univ. 15(4): 44. 1993). Quercus muliensis has the growth habit and leaf dimensions characteristic of Q. monimotricha but the leaf and branchlet indumentum characteristic of Q. senescens.