Amaranthus crispus (Lesp. & Thév.) N. Terracc.

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.

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

Flowering summer-fall.

Waste places, other disturbed habitats, mostly at seaports and on ballast; 0-500m.

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

Amaranthus crispus (Lesp. & Th£v.) A. Br. ; A. Gray, Marx
ed. 6. 428. 1890.
Euxolus crispus I^esp. & Thev. Bull. Soc. Bot. France 6: 656. 1859. Albersia crispa Aschers.; Hausskn. Ber. Deuts. Bot. Ges. 8: 121. 1890. Amaranthus cristulatus Speg. Com. Mus. Nac. Buenos Aires l 10 : 344. 1901.
Stems slender,. pubescent, much branched, spreading, forming mats 2-8 dm. in diameter; petioles stout, 2-5 mm. long; leaf -blades rhombic-ovate to oblong, 6-25 mm. long, acutish at the apex, broadly cuneate at the base, thick, conspicuously crispate, puberulent beneath, prominently nerved; flowers monoecious, in small axillary clusters shorter than the petioles; bracts lanceolate to oblong, cuspidate, shorter than the sepals; sepals of the staminate flowers oblong, acute, those of the pistillate flowers oblong to oblanceolate, obtuse, cuspidate, scarious, 1.5 mm. long; stamens 5; style-branches 3; utricle biturbinate, thinwalled, rugose, indehiscent; seed obovate, 0.8 mm. long, black, shining. Type locality: Bessan, France.
Distribution: Argentina; adventive in waste ground in New York, North Carolina, and Louisiana; also in Europe.

Amaranthus crispus is a species of flowering plant in the family Amaranthaceae. It is referred to by the common name crispleaf amaranth. It is a herbaceous, sparsely pubescent annual plant. It can grow up to 0.5 m (1.5 ft) in height. It flowers in summer to fall. It usually grows in waste places, disturbed habitats, or near water. It is native to Argentina, Chile and Uruguay and has been introduced into Australia, Austria, Bulgaria, Crimea, Czechoslovakia, France, Hungary, Italy, Romania, Sardinia, the United States, and Yugoslavia.