司氏马先蒿 i shi ma xian hao

Herbs perennial, drying black. Stems more than 70 cm tall, erect, hollow, pilosulous. Basal leaves scalelike; stem leaves clasping, linear, to 7 cm X 7 mm, base hastate, margin incised-double dentate, teeth more than 60 pairs. Inflorescences to 20 cm; bracts ovate-lanceolate, ciliate. Calyx ca. 1.1 cm; lobes 5, triangular-ovate, ciliate, ± entire. Corolla yellow; tube ca. 1.2 cm; galea falcate, inconspicuously navicular, margin bearded; beak short, indistinct, decurved; lower lip ca. 7 mm X 1 cm. 2 filaments pubescent, 2 glabrous. Fl. Aug, fr. Sep.

* Amidst grass in shrubbery; ca. 3900 m. W Sichuan.