Amaranthus thunbergii


in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 13(2): 262. 1849.

Common names: Thunberg’s amaranth
Treatment appears in FNA Volume 4. Treatment on page 433. Mentioned on page 413.

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 oblanceolate, 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).

Phenology: Flowering summer–fall.
Habitat: Uncommon, casual alien near wool-combing mills


Introduced; S.C., native to Africa.


Selected References


Lower Taxa

... more about "Amaranthus thunbergii"
Sergei L. Mosyakin +  and Kenneth R. Robertson +
Moquin-Tandon +
Undefined subg. Albersia +
Thunberg’s amaranth +
S.C. +  and native to Africa. +
Uncommon, casual alien near wool-combing mills +
Flowering summer–fall. +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
Acanthochiton +, Acnida +, Albersia +, Amblogyna +, Euxolus +, Mengea +, Sarratia +  and Scleropus +
Amaranthus thunbergii +
Amaranthus subg. Albersia +
species +