Amaranthus cruentus |
Amaranthus viscidulus |
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blood amaranth, caterpillar amaranth, purple amaranth, red amaranth |
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Habit | Plants almost glabrous or slightly pubescent distally, especially when young. | Plants densely viscid-pubescent (especially distal parts), becoming glabrescent proximally. |
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. |
erect or ascending, often whitish or tinged with red, usually branched distally, sometimes proximally, to nearly simple, 0.2–1 m. Leaves: petiole usually longer than or ± equaling blade; blade rhombic-ovate, ovate, obovate, or elliptic, 1–4.5 × 0.5–2.5 cm, usually somewhat fleshy, base cuneate, margins entire, apex obtuse to slightly emarginate, with terminal mucro. |
Bracts | narrowly spathulate, 2–3 mm, equaling or slightly longer than tepals, apex short-spinescent. |
lanceolate to linear-lanceolate, 5–10 mm, longer than tepals, apex spinescent. |
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, usually unbranched, stout spikes and axillary clusters, erect, usually greenish or reddish, leafless at least distally. |
Staminate flowers | at tips of inflorescences; tepals 5; stamens (4–)5. |
few at tips of inflorescences; tepals 5; stamens 3–5. |
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 5, elongate, not clawed, unequal or subequal, 1.5–2.5 mm, apex obtuse to subacute; style branches elongated, shorter than body of fruit; 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. |
black, lenticular to subglobose-lenticular, 1–1.2 mm diam., smooth, shiny. |
Utricles | obovoid to elongate-obovoid, 2–2.5 mm, smooth or slightly rugose distally, dehiscence regularly circumscissile. |
subglobose to broadly obovoid, 1.3–2.5 mm, equal or subequal to tepals, shorter than style branches, smooth or slightly rugose, dehiscence regularly circumscissile. |
Amaranthus cruentus |
Amaranthus viscidulus |
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Phenology | Flowering summer–fall. | Flowering summer–fall. |
Habitat | Near places of cultivation | Open dry slopes, other naturally disturbed habitats |
Elevation | 1500-2500 m (4900-8200 ft) | |
Distribution |
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
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NM |
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.) |
Amaranthus viscidulus is known only from scattered localities in central and southern New Mexico; it probably also occurs in adjacent territories of Mexico. The name A. bracteosus Uline & W. L. Bray has been misapplied to this species by some authors. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 4. | FNA vol. 4, p. 422. |
Parent taxa | Amaranthaceae > Amaranthus > subg. Amaranthus | Amaranthaceae > Amaranthus > subg. Amaranthus |
Sibling taxa | ||
Synonyms | A. hybridus subsp. cruentus | |
Name authority | Linnaeus: Syst. Nat. ed. 10, 2: 1269. (1759) | Greene: Pittonia 3: 344. (1898) |
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