Amaranthus crispus

(Lespinasse & Thévenau) A. Braun ex J. M. Coulter & S. Watson in A. Gray et al.

in A. Gray et al., Manual ed. 6, 428. 1890

Common names: Crisp-leaved amaranth
Basionyms: Euxolus crispus Les pinasse & Thévenau Bull. Soc. Bot. France 6: 656. 1859
Treatment appears in FNA Volume 4. Treatment on page 431. Mentioned on page 414, 428.
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.

Phenology: Flowering summer–fall.
Habitat: Waste places, other disturbed habitats, mostly at seaports and on ballast
Elevation: 0-500 m


N.J., N.Y., N.C., Va., native to South America (Argentina), introduced in s Eurasia and other regions.




Lower Taxa

No lower taxa listed.