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

35. Amaranthus thunbergii Moquin-Tandon in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 13(2): 262. 1849.

Thunberg’s amaranth

Plants annual, pubescent when young, becoming glabrescent at maturity. Stems decumbent or erect, branched proximally, 0.7-1 m. Leaves: petiole 1/2-11/2 times as long as blade; blade obovate or obovate-elliptic to oblan-ceolate, 1-2 × 0.5-1 cm, base cuneate to attenuate, margins entire, apex obtuse, rounded, or slightly emarginate, mucronate. Inflorescences axillary clusters extending to near base. Bracts of pistillate flowers lanceolate, 2-4 mm, shorter than tepals. Pistillate flowers: tepals 3, reflexed, ovate-elliptic to lanceolate, 3-5 mm, apex tapering and long-aristate; style branches spreading; stigmas 2. Staminate flowers intermixed with pistillate; tepals 3, equal; stamens 3. Utricles ellipsoid or ellipsoid-ovoid, 2 mm, shorter than tepals, mostly smooth (or slightly rugose distally), dehiscence regularly circumscissile. Seeds black, subglobose or lenticular, 1-1.4 mm diam., semishiny (or minutely punctulate and reticulate).

Flowering summer-fall. Uncommon, casual alien near wool-combing mills; introduced; S.C.; native to Africa.


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