Botanical name: Vandellia pusilla Family: Linderniaceae (Lindernia family)
Synonyms: Lindernia pusilla, Lindernia hirta
Tiny Slitwort is an annual herb, up to a foot tall, spreading, sometimes carrying long runners. Flowers are borne at branch-ends, in umbel- or raceme-like 3-5-flowered clusters. Flower-stalks are slender, 0.8-1.5 cm, hairy to nearly hairless. Calyx is deeply lobed; sepals lanceshaped, coarsely hairy outside. Flowers are blue purple, about 9 mm; lower lip about 5.5 mm, much longer than upper lip; upper lip broadly ovate, notched. Filaments of anterior stamens slender, base geniculate. Stigma is 2-lamellate. Stems are nearly erect, nearly hairless or hairy, densely coarsely hairy on nodes, internodes to 6 cm. Leaves are short stalked below, stalkless above; leaf blade ovate, heart-shaped, or occasionally round, up to 1.2 cm, sparsely with appressed coarse hairs, base wedge-shaped to somewhat heart-shaped, margin nearly rounded toothed or entire, veins impressed on upper surface. Capsule ovoid-spherical, almost as long as persistent calyx. Seeds oblong, tuberculate. Tiny Slitwort is found by water, wet places, rice fields, forests, at altitudes of 800-1600 m, in China, Cambodia, India, Indonesia, Laos, Malaysia, Myanmar, Nepal, New Guinea, Philippines, Sri Lanka, Thailand, Vietnam. Flowering: May-September.
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