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Alternanthera sessilis (L.) R. Br. ex DC.  
Go To Encyclopedia of Life...
Family: Amaranthaceae
Sessile Joyweed
[Alternanthera nodiflora R. Br., moreAlternanthera polygonoides , Alternanthera sessilis var. nodiflora (R. Br.) Kuntze]
Alternanthera sessilis image
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Steven E. Clemants in Flora of North America (vol. 4)
Herbs, annual or perennial, 2-6 dm. Stems procumbent, pubes-cent in lines, glabrate. Leaves sessile; blade elliptic to oblong or oblanceolate, 1.2-5 × 0.5-2.2 cm, apex obtuse to acute, glabrous. Inflorescences axillary, sessile; heads white, subglobose or ovoid, 0.5-1.1 cm; bracts keeled, ca. 1/2 as long as tepals. Flowers: tepals white, ovate to lanceolate, 2-3.5 mm, apex acuminate, hairs not barbed; stamens 5; anthers 3-5, globose; pseudostaminodes subulate, margins laciniate. Utricles included within tepals, sides exerted in mature fruit, greenish stramineous, obcordate, 1.3-1.7 mm, apex retuse. Seeds lenticular, 0.9-1.1 mm. Flowering summer-early fall. Wet disturbed areas; 0-20 m; introduced, Ala., Fla., Ga., La.; Mexico; West Indies; Central America (Belize, Costa Rica, Guatemala, Nicaragua, Panama); South America; Africa; Asia. Alternanthera sessilis is reported from Maryland, Mississippi, South Carolina, and Texas, but I have seen no specimens from these states.

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Stephanie Harvey  
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Kathy M. Davis, University of Florida Herbarium  
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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)