The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

blood amaranth, caterpillar amaranth, purple amaranth, red amaranth

Argentina amaranth, deflexed amaranth, large-fruit amaranth, low amaranth

Habit Plants almost glabrous or slightly pubescent distally, especially when young. Plants short-lived perennial or annual, pubescent in distal parts of plant or becoming glabrescent at maturity.
Stems

erect, green or reddish purple, branched distally, mostly in inflorescence, to nearly simple, 0.4–2 m. Leaves: petiole 1/2 as long as to ± equaling blade;

blade rhombic-ovate or ovate to broadly lanceolate, 3–15(–20) × 1.5–10(–15) cm, occasionally larger in robust plants, base cuneate to broadly cuneate, margins entire, plane, apex acute or subobtuse to slightly emarginate, with mucro.

ascending or prostrate, profusely branched basally, radiating from rootstock, mostly 0.2–0.5 m. Leaves: petiole 1/2 as long as to equaling blade;

blade rhombic-ovate or ovate to lanceolate, 1–2 × 0.5–1 cm, base tapering or cuneate, margins entire, plane or slightly undulate, apex subacute, obtuse, or retuse or shallowly emarginate, mucronulate.

Bracts

narrowly spathulate, 2–3 mm, equaling or slightly longer than tepals, apex short-spinescent.

of pistillate flowers linear, 0.5–1 mm, 1/2 as long as tepals.

Inflorescences

terminal and axillary, erect, reflexed, or nodding, usually dark red, purple, or deep beet-red, less commonly almost green or greenish red, leafless at least distally, large and robust.

terminal, erect, compact, pyramidal panicles and also some axillary clusters, green or silvery green, occasionally tinged with red, leafless at least distally.

Staminate flowers

at tips of inflorescences;

tepals 5;

stamens (4–)5.

clustered at tips of inflorescences;

tepals 2–3;

stamens 2–3.

Pistillate flowers

tepals 5, oblong to lanceolate, not clawed, equal or subequal, 1.5–3 mm, apex acute;

style branches erect or slightly reflexed;

stigmas 3.

tepals 2–3, narrowly elliptic or oblanceolate, not clawed, equal or subequal, 1.2–2 mm, apex broadly acute;

style branches erect;

stigmas 3.

Seeds

usually white or ivory, with reddish or yellowish tint, sometimes dark brown to dark reddish brown, broadly lenticular to elliptic-lenticular, 1.2–1.6 mm diam., smooth or indistinctly punctate.

very dark brown to black, 1–1.2 mm diam., shiny, filling only proximal portion of fruit.

Utricles

obovoid to elongate-obovoid, 2–2.5 mm, smooth or slightly rugose distally, dehiscence regularly circumscissile.

marked with 2(–3) green lines that intersect at apex and divide fruit into halves or quarters, slightly to distinctly inflated, ellipsoid, 2–3 mm, distinctly longer than tepals, smooth (in dry plants wrinkled or rugose), indehiscent.

Amaranthus cruentus

Amaranthus deflexus

Phenology Flowering summer–fall. Flowering summer–fall.
Habitat Near places of cultivation Weedy areas, ballast heaps, railroads, other disturbed habitats
Elevation 0-500 m (0-1600 ft)
Distribution
from FNA
AZ; CA; CT; IL; IN; KY; MA; MD; ME; MI; NC; NE; NH; NJ; NY; OH; OR; PA; RI; SC; TX; UT; VT; WA; WI; WV; Central America; South America; cultivated widely
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; CA; FL; GA; LA; MA; NJ; NY; OR; PA; TN; VA; native to South America [Introduced in North America; locally introduced or naturalized in tropical to warm-temperate regions of the globe]
[WildflowerSearch map]
[BONAP county map]
Discussion

Amaranthus cruentus is cultivated as ornamental and pseudocereal almost worldwide from tropical to warm-temperate regions. While reported as naturalized in several states, most specimens identified as this species are referable to A. hybridus or other native species. Escaped plants of A. cruentus sometimes occur near places of cultivation (see note under A. caudatus). No attempt has been made to summarize distribution data for such escapes.

Amaranthus cruentus originated from A. hybridus (most probably in cultivation in Central America), with which it shares almost all major morphologic characteristics. Inclusion of cultivated forms in A. hybridus in a broad sense is thus rather justified. Cultivated species traditionally have been treated as separate taxa in horticultural and agricultural literature, and we prefer to maintain the current convenient usage of these names.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

The hybrid between Amaranthus deflexus and A. muricatus was described from Europe as A. ×tarraconensis Sennen & Pau (see J. L. Carretero 1979) and may be expected in North America in the future in places of possible co-occurrence of the parental species.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 4. FNA vol. 4, p. 430.
Parent taxa Amaranthaceae > Amaranthus > subg. Amaranthus Amaranthaceae > Amaranthus > subg. Albersia
Sibling taxa
A. acanthochiton, A. albus, A. arenicola, A. australis, A. blitoides, A. blitum, A. californicus, A. cannabinus, A. caudatus, A. crassipes, A. crispus, A. deflexus, A. dubius, A. fimbriatus, A. floridanus, A. graecizans, A. greggii, A. hybridus, A. hypochondriacus, A. muricatus, A. obcordatus, A. palmeri, A. polygonoides, A. powellii, A. pumilus, A. retroflexus, A. scleropoides, A. spinosus, A. tamaulipensis, A. thunbergii, A. torreyi, A. tricolor, A. tuberculatus, A. viridis, A. viscidulus, A. watsonii, A. wrightii
A. acanthochiton, A. albus, A. arenicola, A. australis, A. blitoides, A. blitum, A. californicus, A. cannabinus, A. caudatus, A. crassipes, A. crispus, A. cruentus, A. dubius, A. fimbriatus, A. floridanus, A. graecizans, A. greggii, A. hybridus, A. hypochondriacus, A. muricatus, A. obcordatus, A. palmeri, A. polygonoides, A. powellii, A. pumilus, A. retroflexus, A. scleropoides, A. spinosus, A. tamaulipensis, A. thunbergii, A. torreyi, A. tricolor, A. tuberculatus, A. viridis, A. viscidulus, A. watsonii, A. wrightii
Synonyms A. hybridus subsp. cruentus
Name authority Linnaeus: Syst. Nat. ed. 10, 2: 1269. (1759) Linnaeus: Mant. Pl. 2: 295. (1771)
Web links