西藏延龄草 xi zang yan ling cao

Trillidium govanianum (Wallich ex Royle) Kunth.

Plants 12--20 cm tall. Rhizome creeping, slightly elongate, terete, 8--10 mm thick. Stem solitary. Leaves shortly petiolate, ovate or ovate-cordate, 4--6 × 2.2--4 cm. Peduncle 2--3 mm. Flowers 2--2.5 cm wide. Outer tepals green, linear or linear-lanceolate, 1--1.2 cm × 1.5--2 mm; inner ones purple-red, very similar to outer ones in shape, 1.1--1.5 cm × ca. 1 mm. Stamens ca. 1/4 as long as tepals; filaments ca. 2 mm; anthers ca. 1.5 mm. Ovary purple-red, ovoid-globose, 5--6 × 4--5 mm. Fl. May--Jun.

Forests; ca. 3200 m. S Xizang (Dinggyê Xian) [Bhutan, India, Nepal, Sikkim].