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Pilea
Family: Urticaceae
Pilea image
Arizona State University Herbarium  
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David E. Boufford in Flora of North America (vol. 3)
Herbs, shrubs, or subshrubs , annual or perennial, glabrous. Stems simple or branched, erect, ascending, or repent. Leaves opposite; stipules present. Leaf blades paired, equal or unequal, ovate, margins dentate or entire; cystoliths linear, ± conspicuous. Inflorescences axillary, compact to lax cymes. Flowers unisexual, staminate and pistillate flowers in same cyme; bracts deltate to linear. Staminate flowers: tepals 4; stamens 4; pistillode conic. Pistillate flowers: tepals 3, equal or sometimes 1 tepal enlarged and hoodlike; staminodes 3, opposite tepals, under tension and ejecting mature achene; style and tufted stigma deciduous. Achenes sessile, laterally compressed, ovoid to teardrop-shaped, free from perianth at maturity, partly covered by hoodlike tepal. x = 12, 13. Pilea should be further revised.

SELECTED REFERENCES
Chen, C. J. 1982. A monograph of Pilea (Urticaceae) in China. Bull. Bot. Res., Harbin 2: 1-132. Fernald, M. L. 1936. Pilea in eastern North America. Contr. Gray Herb. 113: 169-170. Hermann, F. J. 1940. The geographic distribution of Pilea fontana. Torreya 40: 118-120.

Vascular plants of NE US and adjacent Canada
Monoecious or dioecious; cal of the male fls deeply 4-parted; stamens 4; cal of the female fls deeply 3-parted, the segments often unequal or gibbous or hooded; staminodes minute, scale-like; stigma sessile; fr a compressed, thin- walled achene, loosely subtended by the persistent cal; herbs with opposite lvs, inconspicuous, connate stipules, and axillary cymes of small, greenish fls, the numerous cystoliths appearing as minute, whitish lines on the surface of the lf in herbarium-specimens blades with scattered, minute stinging hairs. 200, mainly trop.

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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Show all taxa || << 1 - 50 taxa >>
Pilea acuminata
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Pilea antioquensis
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Pilea apiculata
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Pilea auricularis
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Pilea brevicornuta
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Pilea cadierei
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Pilea centradenioides
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Pilea dauciodora
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Pilea depressa
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Pilea ecboliophylla
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Pilea elegans
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Pilea elliptica
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Pilea engleri
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Pilea falcata
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Pilea fasciata
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Pilea fontana
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Pilea glabra
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Pilea grandifolia
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Pilea herniarioides
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Pilea holstii
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Pilea hyalina
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Pilea inaequalis
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Pilea involucrata
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Pilea irrorata
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Pilea japonica
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Pilea krugii
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Pilea leptophylla
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Pilea margarettae
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Pilea margarettiae
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Pilea mexicana
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Pilea microphylla
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Pilea mollis
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Pilea multicaulis
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Pilea notata
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Pilea nummulariifolia
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Pilea obtusata
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Pilea opaca
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Pilea pansamalana
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Pilea parietaria
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Pilea peploides
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Pilea perfragilis
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Pilea pteridophylla
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Pilea pubescens
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Pilea pumila
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Pilea purulensis
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Pilea quadrata
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Pilea repens
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Pilea richardii
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Pilea rivoriae
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Pilea rivularis
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The National Science Foundation
Developments of SEINet, Symbiota, and associated specimen databases have been supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)