Amaranthus cruentus |
Amaranthaceae |
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blood amaranth, caterpillar amaranth, purple amaranth, red amaranth |
amaranth family |
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Habit | Plants almost glabrous or slightly pubescent distally, especially when young. | Herbs, rarely subshrubs, annual or perennial; trichomes simple (branched in Tidestromia). | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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. |
without nodal spines (Amaranthus spinosus sometimes with paired nodal spines). |
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Leaves | alternate or opposite, exstipulate, usually petiolate; blade margins entire (entire or serrulate in Iresine; entire, crispate, or erose in Amaranthus). |
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Bracts | narrowly spathulate, 2–3 mm, equaling or slightly longer than tepals, apex short-spinescent. |
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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. |
cymules arranged in spikes, panicles, thyrses, heads, glomerules, clusters, or racemes; each flower subtended by 1 bract and 2 bracteoles (latter sometimes 1 or absent in Amaranthus). |
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Flowers | bisexual or unisexual (plants then monoecious or dioecious), hypogynous, generally small or minute; tepals mostly (1–)4–5 or absent, distinct or connate into cups or tubes, scarious, chartaceous, membranaceous, or indurate; stamens 2–5, filaments basally connate into cups or tubes, rarely distinct, alternating with pseudostaminodes (appendages on staminal tubes) or not, anthers 2-locular with 1 line of dehiscence or 4-locular with 2 lines of dehiscence; ovary superior, 1-locular; ovules 1 or, rarely, 2–many; style 1 or absent; stigmas 1–3(–5). |
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Staminate flowers | at tips of inflorescences; tepals 5; stamens (4–)5. |
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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. |
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Fruits | utricles, dry, dehiscent or not. |
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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, reddish brown, or brown, lenticular, subglobose or globose (rarely cylindric), usually small; embryo peripheral, surrounding mealy perisperm. |
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Utricles | obovoid to elongate-obovoid, 2–2.5 mm, smooth or slightly rugose distally, dehiscence regularly circumscissile. |
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Amaranthus cruentus |
Amaranthaceae |
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Phenology | Flowering summer–fall. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Habitat | Near places of cultivation | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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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Nearly worldwide; most abundant in tropics; subtropics; and warm-temperate regions; evidently absent from alpine and arctic regions |
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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.) |
Genera ca. 65, species ca. 900 (12 genera, 80 species in the flora). Centers of diversity for Amaranthaceae are southwestern North America, Central America, South America, and Africa south of the Sahara Desert. Generic limits are not well defined in some groups; fewer than 60 or more than 70 genera could be recognized. Some species occur in severe habitats such as sandy, calcareous, gypseous, saline, or serpentine soils in deserts, semideserts, and seashores. Some species are weedy, including the major agricultural weeds in Amaranthus. Some species are cultivated as ornamentals, particularly Amaranthus caudatus (love-lies-bleeding), A. hypochondriacus (prince’s-feather), A. tricolor (Joseph’s-coat), Celosia cristata (cockscomb), and Gomphrena globosa (globe-amaranth). Native Americans domesticated white-seeded grain amaranths (A. caudatus, A. cruentus, and A. hypochondriacus) for use as cereal grains. Some species of Amaranthus and Celosia are potherbs. Amaranthaceae are usually divided into subfamilies Amaranthoideae (anthers 4-locular with two lines of dehiscence) and Gomphrenoideae Schinz (anthers 2-locular with one line of dehiscence). Amaranthaceae and Chenopodiaceae have long been recognized as allied families that share a number of features: generally small flowers, one perianth whorl, a syncarpous gynoecium with a superior ovary and often only one ovule, basal or free-central placentation, pollen characteristics, centrospermous embryo development, betalain pigments, and P-type form (c) sieve-element plastids. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 4. | FNA vol. 4, p. 405. | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Parent taxa | Amaranthaceae > Amaranthus > subg. Amaranthus | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Sibling taxa | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
Subordinate taxa | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
Synonyms | A. hybridus subsp. cruentus | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Name authority | Linnaeus: Syst. Nat. ed. 10, 2: 1269. (1759) | Jussieu | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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