Excerpt from Flora of the Upper Gangetic Plain, and of the Adjacent Siwalik and Sub-Himalayan Tracts
Herbs, shrubs or trees. Leaves usually opposite, entire, exstipulate. Flowers 2 (rarely 1) sexual, regular, sometimes dimorphous; inflorescence various; bracts often forming an involucre, free or connate. Perianth small, monophyllous, usually petaloid, the tube persistent, enveloping the fruit; limb 3-5-lobed, persistent or deciduous, lobes plicate in bud. Stamens 1-30, hypogynous, sometimes unilateral; filaments usually unequal, indexed in bud ; anthers included or exserted, dorsifixed, didymous. Ovary free, 1 celled; style filiform, involute in bud, stigma simple or multifid; ovule solitary, basal, erect. Fruit membranous, indehiscent, enclosed in the hardened perianth-tube. Seed erect, testa adherent, albumen soft or floury, embryo curved or straight and with folded cotyledons, radicle inferior. - Species about 220, chiefly in Trop. America.
Boerhaavia, Linn.; FI. Brit. Ind. iv, 703.
Erect or diffuse herbs, often with divaricate branches. Leaves opposite, often unequally paired. Flowers small, arranged in panicles umbels or heads, pedicels jointed; bracteoles minute, often deciduous, rarely whorled and involucrate.
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