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Imperata brasiliensis Trin.
Family: Poaceae, Tribe: Andropogoneae
Common names: Brazilian satintail
Disseminule: Spikelet; disarticulation below glumes.
Spikelets subterete, 3.5-5 mm long (excluding callus hairs), of 1 fertile floret and 1 (usually absent) basal sterile lemma. Spikelet callus with silky hairs 8-12 mm long. Glumes lanceolate, pointed. Sterile lemma (if present) ca. 1 mm long, hyaline. Fertile lemma and palea shorter than glumes, hyaline. Styles persistent, at least in part. Caryopsis oblanceolate, 0.8-1.5 mm long.
Imperata brasiliensis is often confused with Imperata cylindrica (L.) Räusch.
Imperata brasiliensis: 2 bracts within glumes, rarely 3; 1 stamen in flower
Imperata cylindrica: 3 bracts within glumes; 2 stamens in flower
South America, Central America, Mexico, and the West Indies, United States.
Low altitudes, sandy and humid soils, pinelands; a weed of waste places and perennial crops.
Imperata brasiliensis is an erect, tufted perennial grass with rhizomes, to 100 cm tall. It is abundant and weedy in Brazil; invading soybeans and Yerba mate (Ilex paraguariensis A. St.-Hil., which is used as tea.).