Atriplex glabriuscula |
Atriplex pleiantha |
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bract orache, glabrous orach, scotland orache |
four-corners orach |
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Habit | Herbs, monoecious, prostrate or sprawling, or sometimes erect, branched, (1–)2–10 dm; branches opposite or subopposite. | Herbs, branching from base, mainly 0.5–1.5 dm, glabrous or sparingly scurfy. | ||||||||
Stems | green and striped, often blue-green when fresh, weakly ridged, sparsely scurfy to glabrous. |
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Leaves | petiole 0.2–2.5(–3.5) cm; blade all entire or some or all triangular or lance-hastate with lobes spreading to antrorse, 5–100 × 3–80 mm, base abruptly to narrowly cuneate, entire or irregularly toothed. |
alternate to subopposite, petiolate; blade ovate to suborbiculate, 5–18(–20) mm, about as wide, margin entire, apex obtuse to acute. |
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Flowers | in loose glomerules, arranged in foliose, interrupted spikes or axillary, terminating stems and branches. |
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Staminate flowers | in short terminal spikes. |
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Seeds | dimorphic: brown, 2.5–4 mm wide (often the only ones present), or black, (1.2–)1.5–2.9(–3) mm wide; radicle median, ± antrorse, of brown seed basal and spreading. |
falling at maturity, black, 1.5 mm, shining, smooth. |
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Bracteoles | green, becoming black or reddish to yellow brown, sessile or some short stipitate, venation obscure, ovate-triangular to rhombic-triangular, 5–13 mm, margin united almost to middle, with few irregular teeth or entire, apex abruptly acuminate, faces irregularly muricate, tuberculate, or smooth, inflated, spongy inner layer strongly developed at bracteole base. |
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Fruiting | bracteoles short stipitate, compressed, 3–7 mm wide and about as long, entire; perianth consisting of 5 hyaline, sparsely ciliate scales 1–1.2 mm. |
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2n | = 18, 36. |
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Atriplex glabriuscula |
Atriplex pleiantha |
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Phenology | Flowering late summer–fall. | |||||||||
Habitat | Salt-desert shrub community | |||||||||
Elevation | 1400-1500 m (4600-4900 ft) | |||||||||
Distribution |
CT; MA; ME; NH; PA; AB; MB; NB; NS; PE; QC; Europe
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AZ; CO; NM; UT |
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Discussion | Varieties 3 (3 in the flora). Members of the Atriplex glabriuscula complex occupy saline or brackish marshes and saline coastal strands mainly in the eastern maritime provinces of Canada, with extensions in similar habitats into the northeastern United States. They are seldom, if ever, ruderal weeds and appear to be indigenous or perhaps early introduced in some part from similar European habitats. The constituent taxa have been regarded at specific level (P. M. Taschereau 1972; I. J. Bassett et al. 1983). They are, however, alike in all major morphologic features, and are apparently closely allied. For those who wish to treat them at specific level, the names are supplied in the synonymy. (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. 345. | ||||||||
Parent taxa | Chenopodiaceae > Atriplex > subg. Atriplex > sect. Teutliopsis | Chenopodiaceae > Atriplex > subg. Obione > sect. Pleianthae | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Proatriplex pleiantha | |||||||||
Name authority | Edmondston: Fl. Shetland, 39. (1845) | W. A. Weber: Madroño 10: 189, figs. 1, 2. (1950) | ||||||||
Web links |