Botanical name: Rhynchosia minima Family: Fabaceae (Pea family)
Synonyms: Dolicholus minimus, Dolichos minimus
Burn-Mouth Vine is a climbing or prostrate herb, emerging from a woody rootstock. Stems are 1 to several ft long, smooth or velvety. Leaves are trifolitae, with 3 rhombic, ovate, or nearly circular leaflets. The lateral leaflets are oblique. Leaflets are 1-6 cm long, 0.8-5 cm wide. Flowers are borne in loose racemes, 2-15 cm long, in leaf axils. Flowers are brownish outside, and yellow inside. The standard petal is often tinged reddish, 5-10 mm long. Pods are oblong-curved, flattened and slightly constricted between the widely spaced seeds, 0.6-3.5 cm long, 0.3-0.5 cm wide. Burn-Mouth Vine is distributed throughout the tropics. Flowering: August-January.
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The flower labeled Burn-Mouth Vine is ...