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Published In: Collectanea Botanica sub t. 4. 1821. (1 Apr 1821) (Coll. Bot.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: A large genus of about 400 species; distributed in tropical and temperate regions throughout the world.


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Monoecious or dioecious herbs or subshrubs, without stinging hairs and with linear cystoliths. Leaves 3-costate, petiolate, opposite, entire or dentate; stipules interpetiolar. Inflorescence axillary, of compact and globose or paniculate sessile or peduncled cymose clusters. Flowers minute, green unisexual, sessile; bracteate. Calyx (2-3-) 4-lobed or truncate and cupular in male flowers, lobes horned outside below the apex; unequally 3-lobed in female, median lobe largest, cucullate or gibbous. Stamens (2-3) 4; staminodes scale-like, inflexed in female flowers. Ovary straight, style absent, stigma penicillate; pistillode conical or oblong in male flowers. Achenes flattened, ovate or orbiculate, not or partly enveloped by calyx. Seeds with hardly any albumen.

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1 Plants not succulent. Leaves serrate or serrulate ovate or ovate-lanceolate, more than 1 cm long (2)
+ Plants succulent, Leaves entire, obovate, elliptic or suborbicular not more than 10 mm long (cultivated) Pilea microphylla
2 (1) Glabrous. Leaves lanceolate with minute serratures. Achenes granular Pilea scripta
+ Hairy. Leaves ovate with large serratures. Achenes quite smooth Pilea umbrosa
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