劳氏马先蒿 lao shi ma xian hao

Herbs annual, to 50 cm tall, drying slightly black. Stems several, ± woody at base, with 4 lines of hairs. Basal leaves opposite; petiole to 2 cm. Stem leaves in whorls of 4; petiole to 3--5 mm; leaf blade broadly oblong to ovate-oblong, to 4 X 2 cm, pinnatisect; segments 5--7 pairs, lanceolate to linear, pinnatifid, dentate. Inflorescences usually long racemose, to 18 cm, interrupted; proximal bracts leaflike, longer than flowers, distal ones slightly enlarged at base, ± palmately 3--5-cleft, glabrescent. Pedicel short. Calyx 8--10 mm, more than 1/2 cleft anteriorly; lobes 5, ± equal, grouped posteriorly, slender. Corolla yellow, barely 1.3 cm; tube decurved through anterior calyx cleft; galea with deltoid marginal teeth; beak slightly bent or coiled at apex, ca. 5 mm; lower lip ca. 8 X 9 mm, glabrous, middle lobe subrounded. Filaments glabrous. Capsule triangular-ovoid, ca. 1.8 cm.

* Picea and Betula forests. W Gansu, E Qinghai, N Sichuan.