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FNA | Family List | FNA Vol. 4 | Amaranthaceae | Amaranthus

29. Amaranthus crispus (Lespinasse & Thévenau) A. Braun ex J. M. Coulter & S. Watson in A. Gray et al., Manual ed. 6. 428. 1890.

Crisp-leaved amaranth

Euxolus crispus Lespinasse & Thévenau, Bull. Soc. Bot. France 6: 656. 1859

Plants annual, sparsely pubescent. Stems prostrate to ascending, branched mainly from base, 0.1-0.4(-0.5) m. Leaves: petiole shorter than blade; blade rhombic-ovate to oblong, 0.5-1.5(-2.5) × 0.3-0.8(-1.5) cm, base cuneate, margins crisped-erose, conspicuously undulate, apex acute to subobtuse, with short mucro. Inflorescences axillary glomerules, green, axes not thickened, not indurage at maturity. Bracts lanceolate to oblong-lanceolate, 1.2-1.7 mm, ± equaling or slightly shorter than tepals. Pistillate flowers: tepals 5, spatulate-oblong, equal to subequal, 1.2-1.7 mm, margins entire, apex rounded to subacute; style branches spreading; stigmas 3, sessile. Staminate flowers intermixed with pistillate; tepals 5; stamens 5. Utricles ellipsoid or obovoid, 1.5-2 mm, slightly longer than tepals, smooth to slightly wrinkled, indehiscent. Seeds black to dark reddish brown, lenticular to obovoid-lenticular, 0.7-1 mm diam., smooth.

Flowering summer-fall. Waste places, other disturbed habitats, mostly at seaports and on ballast; 0-500 m; introduced; N.J., N.Y., N.C., Va.; native to South America (Argentina); introduced in s Eurasia and other regions.


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