Amaranthus thunbergii

Moquin-Tandon in A. P. de Candolle and A. L. P. P. de Candolle

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


S.C., native to Africa.




Lower Taxa

No lower taxa listed.

Facts about "Amaranthus thunbergii"
AuthorSergei L. Mosyakin + and Kenneth R. Robertson +
AuthorityMoquin-Tandon in A. P. de Candolle and A. L. P. P. de Candolle +
BasionymsUndefined subg. Albersia +
Common nameThunberg’s amaranth +
DistributionS.C. + and native to Africa. +
HabitatUncommon, casual alien near wool-combing mills +
IllustratorYevonn Wilson-Ramsey +
Introducedtrue +
PhenologyFlowering summer–fall. +
Publication titlein A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
Publication year1849 +
ReferenceNone +
Source xml grained fna xml/V4/V4 849.xml +
SynonymsAcanthochiton +, Acnida +, Albersia +, Amblogyna +, Euxolus +, Mengea +, Sarratia + and Scleropus +
Taxon familyAmaranthaceae +
Taxon nameAmaranthus thunbergii +
Taxon parentAmaranthus subg. Albersia +
Taxon rankspecies +
VolumeVolume 4 +