Atriplex argentea |
Atriplex serenana |
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maidenhair spleenwort, silver orach, silver orache, silver saltbush, silverscale, silverscale orache, silverscale saltbush, silvery orache |
bracteate orach, bractscale, saltscale, stinking orach |
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Habit | Herbs, simple or freely branched, 0.5–6 dm; branches rather stout, angled, scurfy when young. | Herbs, annual, erect or sprawling, usually branched often forming tangled mats to 10 × (3–)5–20 dm, ascending branches sparsely scurfy. | ||||||||||||||||||||
Leaves | often opposite proximally, petiolate or distal bracteate ones subsessile, blade lance-ovate, lanceolate, deltoid, or cordate, 5–75 × 4–50(–75) mm, base subhastate or obtuse to acute, margin entire or essentially so, sometimes closely repand-dentate, apex obtuse to acute or rounded, scurfy (glabrous). |
many, subsessile or very short petiolate; blade subconcolorous, lanceolate to oblong, elliptic, or oval, (8–)10–30(–40) × 3–12(–15) mm, margin sharply dentate to entire. |
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Flowers | in axillary glomerules and terminal, interrupted spikes. |
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Staminate flowers | borne in distal axils, or in short dense spikes or panicles, or intermixed with pistillate, with 4–5-parted calyx. |
in glomerules in terminal spikes or panicles 3–20 cm, or reduced to solitary, rounded, terminal glomerule. |
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Pistillate flower | in small clusters, axillary. |
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Seeds | brown, 1.5–2 mm wide; radicle superior or lateral. |
brown, 1–1.3(–1.5) mm. |
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Fruiting | bracteoles sessile, subsessile, or stipitate (stipe 0.5–5 mm), cuneate-orbicular, (2.5–)4–11.2 × 2–8.8(–14) mm, margin foliaceous below apex, subentire or dentate to laciniate, face smooth, tuberculate, or crested, processes sometimes again toothed, teeth then aligned with axis of process. |
bracteoles sessile or subsessile (stipe to 1 mm), cuneate-orbicular to obovate, somewhat compressed, 2.1–3.5 × (1.7–)2–3.7 mm, united 1/2 of length, margin sharply and often slenderly toothed beyond middle, faces often rather strongly veined, smooth or with 1 or more slender or flattened appendages. |
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2n | = 18, 36, 54. |
= 18. |
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Atriplex argentea |
Atriplex serenana |
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Distribution |
AZ; CA; CO; ID; KS; MT; ND; NE; NM; NV; OK; OR; SD; TX; UT; WA; WY; AB; BC; MB; SK; Mexico
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CA; NV; nw Mexico
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Discussion | Varieties 5 (5 in the flora). Herbarium materials have tended to represent a catchall for annual specimens not readily assignable to other taxa. Indeed, the distinguishing features of the Atriplex argentea complex are shared singly and often in combination with other taxa. Only by use of combinations of features can this taxon be defined. Those features, with much variation, center around the broad, typically ovate to deltoid leaf blades (often definitely 3-veined) and more-or-less compressed, sessile to subsessile (or short stipitate), fruiting bracteoles on which the marginal processes, or teeth, are mainly aligned with the plane compression, and with the faces quite smooth to variously appendaged. Still some specimens are apparently intermediate with other species, especially with the closely allied A. saccaria, with which it is at least partially sympatric. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (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. 361. | ||||||||||||||||||||
Parent taxa | Chenopodiaceae > Atriplex > subg. Obione > sect. Obione > subsect. Argenteae | Chenopodiaceae > Atriplex > subg. Obione > sect. Obione > subsect. Arenariae | ||||||||||||||||||||
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Synonyms | Obione argentea | |||||||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 1: 198. (1818) | A. Nelson ex Abrams: Fl. Los Angeles, 128. (1904) | ||||||||||||||||||||
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