二齿马先蒿 er chi ma xian hao

Herbs 6--8 cm tall, gray pubescent throughout. Roots fusiform, slender. Stems nearly absent, tufted. Leaves basal; petiole to 2--3.5 cm; leaf blade linear-oblong, ca. 5 X 1 cm, base attenuate, undulate-lobed; segments subrounded, shallowly undulate-dentate. Flowers axillary, 2--4-flowered. Pedicel short. Calyx cylindric, ca. 1.5 cm, with reticulate veins; lobes 2, elliptic, ca. 5 mm, incised-serrate. Corolla yellow; tube ca. 7.5 cm X 1.5 mm, more than 4 X as long as calyx, pubescent; galea curving downward into a horseshoe-shape; beak nearly straight, ca. 7 mm, ca. as long as galea; lower lip ca. 1.7 X 2.5 cm, middle lobe rounded, ca. 6 X 8 mm, ca. 1/3 as large as lateral lobes. Filaments red pubescent.

* N Sichuan.