马醉草 ma zui cao

Lobelia longiflora Linnaeus, Sp. Pl. 2: 930. 1753; Isotoma longiflora (Linnaeus) C. Presl; Laurentia longiflora (Linnaeus) Petermann; Solenopsis longiflora (Linnaeus) M. R. Almeida.

Stems erect, 9-35 cm tall, simple or branching at base, glabrous or increasingly villous toward apex. Leaves sessile or shortly petiolate; blade 7-16 × 1-3.7 cm, oblanceolate or elliptic, glabrous or sometimes sparsely villous, base attenuate, apex acute or acuminate. Pedicels 3-10 mm, densely villous. Corolla white; tube 6.5-10 cm, villous, entire; lobes elliptic, narrowly elliptic, or linear, 1.8-2.5 cm. Hypanthium campanulate, obconic, or ellipsoid, 6-9 mm, densely villous; calyx lobes linear, 8-19 mm, villous, margin denticulate. Anther tube ca. 7 mm. Capsule obconic, campanulate, broadly ellipsoid, or obovoid, 11-15 × 8-12 mm, densely villous. Seeds light brown to red-brown, broadly ellipsoid, terete or slightly compressed, ca. 0.7 mm, reticulate. 2n = 28.

Guangdong, Taiwan [native to Jamaica; widely introduced and naturalized in tropics and subtropics].