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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Annual to subshrub; monoecious and/or dioecious; occasionally spiny; hairs simple (branched).
Leaf: blade simple, alternate or opposite, margins entire or serrate; veins pinnate; stipules 0.
Inflorescence: axillary or terminal; 3-flowered cymes in dense spikes, heads or panicles; bracts 0 or 1–5, persistent; bractlets 0–2.
Flower: bisexual or unisexual, small, green (± white), yellow or purple; perianth parts 0 or (1)3–5, free or fused basally, scarious or hardened, persistent; stamens 1–5, opposite perianth parts, free or basally fused as a tube, generally unequal, occasionally alternate with appendages on stamen tubes (pseudostaminodes), anthers 2- or 4-chambered; ovary superior, chamber 1; ovule 1 (2–many); style (0)1–3, stigmas 1–3(5).
Fruit: utricle; generally with persistent perianth or bracts.
Seed: 1 [2+], small, lenticular to spheric, smooth or dotted to striate or tubercled.
± 75 genera, 900 species: cosmopolitan, especially disturbed, arid, saline or alkaline soils; some cultivated for food, ornamental; many naturalized, ruderal or agricultural weeds. [Müller & Borsch 2005 Ann Missouri Bot Gard 92:66–102] Amaranthaceae including Chenopodiaceae by some. Polycnemoideae, represented in CA by Nitrophila, formerly considered subfamily of Chenopodiaceae, but needs further research. Guilleminea densa (Willd.) Moq. var. aggregata Uline & W.L. Bray is a waif. Froelichia gracilis (Hook.) Moq. is an historical waif. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.
Unabridged references: [Kadereit et al. 2003 Int J Plant Sci 164:959–986; Robertson 1981 J Arnold Arbor 62:267–313]
Key to Amaranthaceae
Annual (short-lived perennial herb); monoecious or dioecious.Key to Amaranthus
Stem: prostrate to erect, branched or not.
Leaf: alternate, petioled, ovate to linear, tip often ± notched (2-lobed), midvein ending in sharp point, margin entire, flat or wavy.
Inflorescence: 3-flowered cymes, in dense axillary clusters, or large, terminal, panicle- or spike-like inflorescence; bract 1, bractlets 0–2, alike, persistent, spine-like to ± leaf-like or ± membranous, at least margins scarious- membranous.
Staminate flower: perianth parts (2)3–5, scarious; stamens (1)2–5, filaments free; pseudostaminodes 0; anthers 4-chambered.
Pistillate flower: perianth parts (1)3–5, membranous or scarious, free, persistent; ovary ovoid, style 0, stigmas 2–3, persistent, slender, papillate; ovule 1, erect.
Fruit: circumscissile or indehiscent, ovoid to obovoid, smooth or ± wrinkled, tip ± gradually (abruptly) narrowed to stigmas or beak; walls thin, membranous.
Seed: 1, lenticular to ± spheric, round to obovate, smooth, shiny, occasionally obscure-dotted or -net-like, ± white-ivory to brown-red or black.
± 70 species: worldwide; weeds, ornamentals, food plants. (Greek: unfading, non-withering) [Costea et al. 2001 Sida 19:931–974, 975–992; Sauer 1967 Ann Missouri Bot Gard 54:103–137] Hybrids common, F1 generally with numerous, densely packed bractlets beneath generally sterile pistillate flowers, abnormal-shaped inflorescence with dense, twisted or fan-shaped branches. Unless otherwise noted, descriptions of bracts and flower parts are of pistillate flowers.
Unabridged references: [Sauer 1955 Madroño 13:5–46]
Unabridged note: F1 hybrids have been observed in natural conditions or have been experimentally obtained between any of the following species: Amaranthus hybridus, Amaranthus powellii, Amaranthus retroflexus, Amaranthus tuberculatus, Amaranthus palmeri, Amaranthus caudatus, Amaranthus hypochondriacus, Amaranthus cruentus, Amaranthus spinosus, Amaranthus blitoides, Amaranthus albus. Amaranthus caudatus L., Amaranthus cruentus L., Amaranthus hypochondriacus L. frequently cultivated as ornamentals, occasionally escaping from cultivation. Amaranthus spinosus L. probably not naturalized, uncommon waif.
Stem: erect, 20–200(250) cm, branched or not, green, ± glabrous.
Leaf: petiole 60–90 mm; blade 15–150 mm, 10–35 mm wide, ovate, rhombic- ovate to lanceolate, base ± wedge-shaped, tip ± obtuse to acute, margins flat.
Inflorescence: terminal, simple or panicle-like, ± flexible to drooping, main axis 10–35(50) cm, 1–1.8(2.5) cm wide (including flowers), green; staminate bracts 4–6 mm, >= outer perianth parts, spine-like; pistillate bracts 4–6 mm, 1.3–2 × > perianth, spine-like, lance- ovate.
Flower: staminate perianth parts 5, unequal, outer (2.5)3–6 mm, acuminate, spine-tipped, inner 2.5–3 mm, obtuse, notched, stamens 5; pistillate perianth parts 5, unequal, outer 3–4 mm, lanceolate, ± acuminate, inner 1.7–2.5 mm, obovate to spoon-shaped, rounded to ± notched and mucronate; stigmas 2(3), spreading.
Fruit: circumscissile; 1.5–2 mm, < perianth, ± spheric to obovoid, brown to occasionally red-brown, smooth or ± rough near tip.
Seed: 1–1.4 mm wide, lenticular, elliptic to obovate, dark red-brown to black, smooth, shiny.
2n=32, 34. Disturbed areas, agricultural fields; < 1200 m. Great Central Valley, Central Western California, South Coast, Western Transverse Ranges, Desert;
Previous taxon: Amaranthus hypochondriacus
Next taxon: Amaranthus powellii
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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|Bioregions in which taxon occurs||Red area (if present) is the part of the bioregion lying between the upper and lower elevation limits of the taxon;|
markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may have georeferencing or identification issues.
Chart based on elevation range in Manual and elevations and coordinates of CCH records.
Data provided by the participants of the Consortium of California Herbaria.
Note: About half of the CCH records include both elevation and coordinates.
|Map made in collaboration with Scott Loarie. Data provided by the participants of the Consortium of California Herbaria.
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