Botanical Survey of India | Flora of India

JSP Page
Blachia Baill., nom. cons.

Shrubs or trees, monoecious, evergreen, mostly entirely glabrous. Leaves alternate, simple or rarely lobed, penninerved or sometimes weakly to clearly trinerved at base, shortpetioled; stipules inconspicuous. Male inflorescences terminal, cymose, umbellate to racemiform, few-flowered, peduncled; flowers ebracteate; pedicels slender; sepals 4 or 5, free, imbricate; petals 4 or 5, smaller than the sepals, hyaline; disc glands 4 or 5, alternating with petals, scalelike; stamens 10 - 40, free, arranged in whorls on raised receptacle; anthers 2-loculed; locules adnate to a broad connective, free at base, coherent at tip; pistillode absent. Female inflorescences axillary and terminal, often borne at or near the base of male inflorescences, cymose, mostly umbellate (2 - 8-flowered), sometimes solitary, shortly peduncled; flowers ebracteate; pedicels stout; sepals 4 - 6, same as in the male, but shortly connate and accrescent in fruit or deciduous (B. andamanica); petals absent; disc glands connate in a ring or occasionally shortly cupular; ovary 3 - 5-loculed; locules uniovulate; ovules anatropous; styles 3 - 5, erect to reflexed, bifid. Fruits schizocarpic, 3 - 5-lobed; seeds trigonous with a broad convex back, smooth, marbled.

India, Sri Lanka, Bangladesh, Myanmar, Thailand, Indo-china to Malesia, ca 10 species; 3 species in India.

Literature. BALAKRISHNAN, N. P. & T. CHAKRABARTY (1989). Genus Blachia Baill. (Euphorbiaceae) in India. Proc. Indian Acad. Sci. (Pl. Sci.) 99: 567 - 578, ff. 1 - 4.

Notes. The chromosome number reported so far is for one species only, B. calycina having 2n = 36 by Krishnappa & Reshme (Taxon 29: 536. 1980). Pollination is anemophilous. Pollen grains conform to the typical ‘Crotonoid’ pattern (Punt, Wentia 7: 1 - 116. 1972). The species occurs mostly at low elevations up to 900 m, in evergreen forests but may also grow in semi-evergreen or mixed forests or even in beach forests (B. andamanica).


1 a. Female sepals deciduous; leaves often weakly to clearly trinerved at base; the first pair of lateral nerves distinct, not weaker than subsequent pairs; tertiary nerves predominantly scalariform to reticulate 1. Blachia andamanica
b. Female sepals persistent or accrescent; leaves penninerved; the first pair of lateral nerves nor distinct, weaker than subsequent pairs; tertiary nerves predominantly branching into veins of higher order 2
2 a. Female sepals 5 - 15 x 2.5 - 9 mm; fruits 4 - 5-coccous 2. Blachia calycina
b. Female sepals 2 - 5 x 1 - 3 mm; fruits tricoccous 3. Blachia umbellata

JSP Page
  • Search