ALTERNANTHERA SESSILIS PDF

Distribution[ edit ] The plant occurs throughout the tropical and subtropical regions of the Old World. It has been introduced to the southern United States , and its origins in Central and South America are uncertain. Botanical features[ edit ] This is a perennial herb with prostrate stems, rarely ascending, often rooting at the nodes. Flowers in sessile spikes, bract and bracteoles shiny white, 0.

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Top of page Alternanthera is a diverse genus 80— species and the second largest in subfamily Gomphrenoideae of the Amaranthaceae. The highest diversity of this genus occurs in South America, but many species also occur in the Caribbean, Central America and Mexico Sanchez del Pino et al. Description Top of page A. The stems are generally prostrate, creeping, often rooting at the nodes, sometimes floating or ascending at the tips, cylindrical and slightly hairy, with numerous, erect branches.

The leaves are simple, opposite, shortly petiolate or sessile, broadly lanceolate or spatulate to almost linear, 0. They are attenuated at the base, and the apex is acute to blunt, with entire, glabrous or pilose thin, fine, articulate hairs margins.

The inflorescences are dense, sessile, silvery-white clusters of compressed spikes in the leaf axils; perianth segments are equal in length, acute, 1. Bracts are ovate, concave, 0. Sepals are mm long, white or purplish, glossy with a green base, glabrous or with a few long hairs, and a strong midrib. The fruits are indehiscent, a small, flattened, obcordate or obovate utricle, Seeds are dark-brown to black, disc-shaped and shiny, about 0.

They are light sensitive and the average number of seeds per plant is ca Distribution Top of page A. The native range is uncertain Gupta, Many Chinese publications e. Fan et al. It is reported as native to some of the Pacific Ocean island groups and as introduced to others Gupta, However, the most recent study of the genera Alternanthera suggests that A. See Holm et al. Distribution Table Top of page The distribution in this summary table is based on all the information available.

When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.

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