Atriplex argentea |
Atriplex truncata |
|||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
maidenhair spleenwort, silver orach, silver orache, silver saltbush, silverscale, silverscale orache, silverscale saltbush, silvery orache |
truncate saltbrush, wedge orach, wedge orache, wedgeleaf orache, wedgescale, wedgescale orache, wedgescale saltbush |
|||||||||||||||||
Habit | Herbs, simple or freely branched, 0.5–6 dm; branches rather stout, angled, scurfy when young. | Herbs, typically erect. | ||||||||||||||||
Stems | simple or more commonly branched throughout, mainly 2–8(–10) dm, branches mostly obtusely angled; herbage scurfy, becoming glabrate. |
|||||||||||||||||
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). |
alternate or proximalmost opposite, short petiolate proximally, sessile and often cordate-clasping distally; blade ovate to deltoid or oval, 4–30(–40) × 3–30 mm, base truncate or subhastate to rounded, margin entire or dentate, apex acute to obtuse. |
||||||||||||||||
Flowers | in axillary glomerules and terminal, interrupted spikes. |
in axillary glomerules. |
||||||||||||||||
Staminate flowers | borne in distal axils, or in short dense spikes or panicles, or intermixed with pistillate, with 4–5-parted calyx. |
in glomerules mainly in distal axils; sepals 3–5. |
||||||||||||||||
Seeds | brown, 1.5–2 mm wide; radicle superior or lateral. |
brown, 1–2 mm wide. |
||||||||||||||||
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 scarcely compressed, 2–3 mm and as wide, apex truncate to broadly rounded, with 3 (or more) teeth across summit, surfaces smooth (or rarely tuberculate). |
||||||||||||||||
2n | = 18, 36, 54. |
= 18. |
||||||||||||||||
Atriplex argentea |
Atriplex truncata |
|||||||||||||||||
Phenology | Flowering summer–fall. | |||||||||||||||||
Habitat | Saline saltgrass-greasewood-rabbitbrush communities, and other pans or palustrine or lacustrine habitats | |||||||||||||||||
Elevation | 400-2700 m (1300-8900 ft) | |||||||||||||||||
Distribution |
AZ; CA; CO; ID; KS; MT; ND; NE; NM; NV; OK; OR; SD; TX; UT; WA; WY; AB; BC; MB; SK; Mexico
|
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; SK
|
||||||||||||||||
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.) |
|||||||||||||||||
Key |
|
|||||||||||||||||
Source | FNA vol. 4. | FNA vol. 4, p. 354. | ||||||||||||||||
Parent taxa | Chenopodiaceae > Atriplex > subg. Obione > sect. Obione > subsect. Argenteae | Chenopodiaceae > Atriplex > subg. Obione > sect. Obione > subsect. Truncatae | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | Obione argentea | Obione truncata, A. subdecumbens, A. truncata var. stricta | ||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 1: 198. (1818) | (Torrey ex S. Watson) A. Gray: Proc. Amer. Acad. Arts 8: 398. (1873) | ||||||||||||||||
Web links |
|
|