凹脉鹅掌柴 ao mai e zhang chai

Panax rhododendrifolius Griffith, Init. Pl. Khasyah Mts. 487. 1848; Agalma glaucum Seemann; A. tomentosum (Buchanan-Hamilton) Seemann; Hedera tomentosa Buchanan-Hamilton; Heptapleurum glaucum (Seemann) C. B. Clarke (1879), not Kurz (1877); H. impressum C. B. Clarke; Schefflera impressa (C. B. Clarke) Harms.

Trees, to 20 m tall, andromonoecious. Petiole to 30 cm; petiolules 1-2.5 cm, stout; leaflets (5 or)6 or 7(-9), narrowly obovate or oblong-lanceolate to nearly elliptic, 12-20 × 3-5 cm, leathery, abaxially densely gray-white stellate pubescent when young, later glabrescent and glaucous, adaxially glabrous and rugose, secondary veins 8-12 pairs, tertiary veins distinctly impressed adaxially in dry material, base cuneate, margin entire, revolute, sometimes with serrate or pinnate lobes on young plants, apex acuminate. Inflorescence a terminal panicle of umbels, densely stellate tomentose, glabrescent; primary axis to 20 cm; secondary axes to 18 cm; pedicels 5-10 mm. Calyx ca. 3 mm, inconspicuously 5-toothed. Ovary 5-carpellate; styles united into a column. Fruit globose, 4-5 mm in diam., 5-angular when dry; styles persistent, 1.5-2 mm; stigmas subcapitate. Fl. Aug, fr. unknown. 2n = 48.

Evergreen broad-leaved forests; 2500-3200 m. SE Xizang [Bhutan, India, Nepal].