波氏马先蒿 bo shi ma xian hao

Herbs perennial, 5--8 cm tall, glabrous except for ciliate leaf sheath and calyx. Roots fleshy. Stem single, unbranched, drying black. Leaves almost all basal, ca. as long as stems; petiole several X as long as leaf blade, sulcate; leaf blade ovate, 2--3.5 X 0.8--1.3 cm; segments 3--5 pairs, obovate, incised-dentate. Inflorescence subcapitate, glabrous; bracts opposite, leaflike, with short dilated petioles. Calyx oblong, 0.9--1.1 mm, thin; lobes 5, unequal, rounded, short, incised-serrate. Corolla yellowish white, 1.8--2 cm; tube erect, longer than calyx; galea bent at a right angle; beak falcate, conical, short, 4--6 mm; lower lip rounded, ca. as long as galea, wider than long, middle lobe smaller than lateral pair, slightly projecting. Filaments pubescent, anterior pair densely so. Fl. Jun.

* Forests. S Gansu.