三脉黄精 san mai huang jing

Stem terete, ca. 90 cm, slender, glabrous. Leaves all opposite, distant, sessile, green adaxially, subglaucous abaxially, linear-lanceolate, 7.5--13 cm, papery, 3-veined, apex acute to acuminate. Peduncle and pedicels 1.2--2 cm. Flowers paired. Perianth tube white, constricted above ovary; lobes green, deltoid, very short. Stamens inserted at mouth of perianth tube; filaments very short, naked; anthers small. Style filiform, 2--3 × as long as the ovary. 2 n = ?36*.

About 1700 m. Xizang [Nepal].

One of us (Tamura) has not seen specimens of this species which, according to Chen (Fl. Xizang. 5: 572. 1987), is related to P. cathcartii. The chromosome number 2 n = 36 was reported for P. griffithii from SE Xizang (Mêdog Xian) by Gu and Sun (Acta Bot. Yunnan. 20: 207--210. 1998), but judging from the photograph of the chromosomes in the paper, the karyotype corresponds well with that of Maianthemum.