Botanical name: Indigofera hamiltonii Family: Fabaceae (Pea family)
Synonyms: Indigofera atropurpurea auct. non Hornem.
Hamilton's Indigo is a shrub or undershrub, with branches thinly velvet-hairy. Leaf are compound, about 2.5-6.5 cm long, leaf-stalk about 1.2-1.3 cm long. Leaflets are mostly 3-5, rarely 11-13, about 1-2 cm long, obovate, oblong, often emargintate, sparesly appressed velvet-hairy on both surfaces; stipules minute falling off. Flowers are borne in long racemes, usually from woody branches, about 20-30 cm long. Bract small falling off, shorter than flower-stalk. Sepal-cup small, teeth triangular, smaller than cup. Flowers are purple with darker lines, about 8-9 mm long. Fruit is about 2.5-3.8 cm long straight, 9-12-seeded. Hamilton's Indigo is found in the Himalayan foothills, at altitudes of about 100m m. Flowering: March-April.
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The flower labeled Hamilton's Indigo is ...