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Acalypha
Family: Euphorbiaceae
Acalypha image
Frankie Coburn
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JANAS 29(1)
PLANTS: Annual or perennial herbs, shrubs, or rarely trees, monoecious or dioecious, without latex. LEAVES: alternate, simple; stipules small. INFLORESCENCE: axillary or terminal, spike-like, rarely panicles, staminate, pistillate, or mixed, then most commonly pistillate below and staminate above. STAMINATE FLOWERS: very small, subsessile, several in the axil of a minute bract; calyx lobes 4; petals and disk 0; stamens 4-8, the anthers pendent, elongated, and twisted at maturity. TYPICAL PISTILLATE FLOWERS: sessile, 1-3 in the axil of an often large foliaceous bract; calyx lobes 3(-5); petals and disk 0; pistil with (1-)3 carpels, the ovary (1-)3-locular, the style branches usually dissected into thread-like segments. ALLOMORPHIC PISTILLATE FLOWERS: sometimes present, distal, differing from typical pistillate flowers by having the ovary strongly 1-3 lobed and the style subbasal, and often by being pedicelled and ebracteate. FRUITS: capsules with (1-)3 locules, each segment splitting and falling from the persistent columella; fruits of allomorphic flowers deeply lobed schizocarps. SEED: 1 per carpel, ovoid, usually carunculate, variously sculptured. NOTES: Ca. 400 spp. worldwide, chiefly of tropical and subtropical regions, a few cultivated as ornamentals. (Greek name for stinging nettle, some species resembling nettles, though not stinging). Levin, G. A. 1994. Madroiio 41:254-265. Miller, L. W. 1964. A taxonomic treatment of the species of Acalypha in the United States. Ph.D. dissertation, Purdue University. Pax, F. and K. Hoffmann. 1924. Euphorbiaceae-Crotonoideae-Acalypheae-Acalyphinae. In: A. Engler (ed.). Das Pflanzenreich, IV, 147, XVI(Heft 85):1-231. Radcliffe-Smith, A. 1973. Kew Bulletin 28:525-529. REFERENCES: Levin, Geoffrey A. Euphorbiaceae Part 1. Acalypha and Cnidoscolus. J. Ariz. - Nev. Acad. Sci. 29(1): 18.
Vascular plants of NE US and adjacent Canada
Monoecious; pet and disk none; staminate fls with 4 valvate sep and 4-8 stamens, the filaments slender, the anthers elongate and often curved or coiled; pistillate fls with 3(-5) sep; styles slender, elongate, irregularly branched or lacerate into filiform segments; capsule (1-)3-locular; seeds with a caruncle; herbs, shrubs, or trees with alternate, petiolate, stipulate, usually serrate lvs and minute fls in axillary or terminal, often conspicuous, racemiform condensed cymose infls, each fl or fascicle of fls subtended by a bract; our spp. annual herbs blooming from July to Oct., with staminate fls only 0.5 mm wide and aggregated into axillary heads or short spikes, the pistillate fls with initially small but rapidly accrescent bracts that equal or exceed the mature pubescent frs. 400, mostly New World.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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Acalypha acapulcensis
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Acalypha adenostachya
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Acalypha aliena
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Acalypha alopecuroidea
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Acalypha alopecuroides
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Acalypha amblyodonta
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Acalypha amentacea
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Acalypha anadenia
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Acalypha anemioides
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Acalypha angatensis
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Acalypha angustata
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Acalypha angustifolia
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Acalypha apodanthes
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Acalypha argomuelleri
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Acalypha aronioides
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Acalypha arvensis
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Acalypha australis
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Acalypha berteroana
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Acalypha bisetosa
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Acalypha botteriana
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Acalypha brachiata
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Acalypha brachyclada
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Acalypha brachystachya
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Acalypha brasiliensis
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Acalypha brevicaulis
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Acalypha burquezii
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Acalypha californica
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Acalypha caperonioides
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Acalypha capillipes
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Acalypha cardiophylla
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Acalypha carrascoana
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Acalypha caturus
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Acalypha chamaedrifolia
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Acalypha chiapensis
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Acalypha chirindica
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Acalypha chordantha
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Acalypha ciliata
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Acalypha cincta
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Acalypha cinerea
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Acalypha claussenii
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Acalypha coleispica
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Acalypha communis
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Acalypha comonduana
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Acalypha confertiflora
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Acalypha conspicua
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Acalypha corchorifolia
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Acalypha coryloides
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Acalypha costaricensis
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Acalypha crenata
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Acalypha cristata
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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