Difference between revisions of "Pilea"
Coll. Bot., plate 4 and text on facing page. 1821, name conserved.
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|name=Adicea | |name=Adicea | ||
|authority=Rafinesque ex Britton & A. Brown | |authority=Rafinesque ex Britton & A. Brown | ||
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|hierarchy=Urticaceae;Pilea | |hierarchy=Urticaceae;Pilea | ||
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|distribution=Mostly tropical and subtropical regions worldwide except Australia and New Zealand. | |distribution=Mostly tropical and subtropical regions worldwide except Australia and New Zealand. | ||
|discussion=<p>Species ca. 400 (5 in the flora).</p><!-- | |discussion=<p>Species ca. 400 (5 in the flora).</p><!-- | ||
| − | --><p>Pilea should be further revised.</p> | + | --><p><i>Pilea</i> should be further revised.</p> |
|tables= | |tables= | ||
|references={{Treatment/Reference | |references={{Treatment/Reference | ||
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name=Pilea | name=Pilea | ||
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|authority=Lindley | |authority=Lindley | ||
|rank=genus | |rank=genus | ||
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|genus=Pilea | |genus=Pilea | ||
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-->[[Category:Treatment]][[Category:Urticaceae]] | -->[[Category:Treatment]][[Category:Urticaceae]] | ||
Latest revision as of 21:45, 5 November 2020
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.
Distribution
Mostly tropical and subtropical regions worldwide except Australia and New Zealand.
Discussion
Species ca. 400 (5 in the flora).
Pilea should be further revised.
Selected References
Lower Taxa
Key
| 1 | Leaf margins dentate; paired blades equal. | > 2 |
| 1 | Leaf margins entire; paired blades unequal. | > 3 |
| 2 | Achenes uniformly black except for very narrow, pale, marginal band, surface conspicuously pebbled with raised bosses. | Pilea fontana |
| 2 | Achenes uniformly light colored or streaked with purple, surface smooth or purple striations sometimes slightly raised. | Pilea pumila |
| 3 | Stems repent or prostrate. | > 3 |
| 3 | Stems erect or diffusely ascending. | > 4 |
| 4 | Herbs; leaf blades spatulate to obovate. | Pilea microphylla |
| 4 | Shrubs or subshrubs; leaf blades of 2 types, obovate and orbiculate to orbiculate-cordate. | Pilea trianthemoides |