Amaranthus cruentus |
Amaranthus obcordatus |
|
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blood amaranth, caterpillar amaranth, purple amaranth, red amaranth |
trans-Pecos amaranth |
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Habit | Plants almost glabrous or slightly pubescent distally, especially when young. | Plants glabrous. |
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, branched, 0.1–0.5 m. Leaves: petiole 1/2 as long as blade; blade oblong-lanceolate to lanceolate-linear, 1–3 × 0.2–1 cm, base cuneate to narrowly cuneate, margins entire, plane or sometimes undulate, apex rounded or obtuse-truncate, mucronate. |
Bracts | narrowly spathulate, 2–3 mm, equaling or slightly longer than tepals, apex short-spinescent. |
broadly ovate, 1 mm or shorter, 1/2 or less length of tepals, apex acute. |
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. |
mostly axillary, but at apex flowers also condensed in terminal spikes or spicate panicles, usually leafy proximally or nearly leafless distally. |
Staminate flowers | at tips of inflorescences; tepals 5; stamens (4–)5. |
tepals (3–)5; stamens 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 5, spreading at maturity, spatulate, clawed, subequal, 2 mm, margins fimbriate, apex rounded or shallowly emarginate; 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. |
dark reddish brown to nearly black, lenticular or broadly lenticular, 0.6–0.8 mm diam., smooth. |
Utricles | obovoid to elongate-obovoid, 2–2.5 mm, smooth or slightly rugose distally, dehiscence regularly circumscissile. |
narrowly oblong, 1–1.4 mm, shorter than tepals, indehiscent. |
Amaranthus cruentus |
Amaranthus obcordatus |
|
Phenology | Flowering summer–fall. | Flowering summer–fall. |
Habitat | Near places of cultivation | Semideserts, naturally disturbed habitats |
Elevation | 1000-1200 m (3300-3900 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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AZ; TX; n Mexico (Sinaloa, Sonora) |
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 obcordatus has been reported only from southern Arizona (T. H. Kearney and R. H. Peebles 1960), trans-Pecos Texas in Brewster and Pecos counties, and adjacent regions of Mexico (C. F. Reed 1969b). It was also tentatively reported for New Mexico, but no localities were cited (W. C. Martin and C. R. Hutchins 1980). The proper taxonomic position of A. obcordatus and its relationships to other species remain problematic and are in need of further study. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 4. | FNA vol. 4, p. 427. |
Parent taxa | Amaranthaceae > Amaranthus > subg. Amaranthus | Amaranthaceae > Amaranthus > subg. Amaranthus |
Sibling taxa | ||
Synonyms | A. hybridus subsp. cruentus | Amblogyna urceolata var. obcordata |
Name authority | Linnaeus: Syst. Nat. ed. 10, 2: 1269. (1759) | (A. Gray) Standley: in N. L. Britton et al., N. Amer. Fl. 21: 107. (1917) |
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