Oxytropis maydelliana |
Oxytropis borealis |
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maydell's locoweed, maydell's oxytrope |
boreal crazyweed, boreal locoweed, Nuttall's oxytrope, sticky crazyweed |
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Habit | Plants cespitose, appearing acaulescent. | Plants cespitose, appearing acaulescent, 4–30 cm, glandular-viscid, especially stipules and calyces, herbage spreading-hairy. | ||||||||||||||||
Leaves | 4–14 cm; stipules stiff, papery, becoming reddish brown, 12–20 mm, free ends caudate-acuminate, pilose to glabrate abaxially, margins ciliate; leaflets 11–21, blades ovate to lanceolate, elliptic, or oblong, 4–17 × 2–4 mm, apex acute or obtuse, surfaces pilose on midrib abaxially, pilose or glabrous adaxially. |
1–25 cm; stipules membranous, light tan or grayish, 8–21 mm, often with debris adhering, usually prominently glandular, pilose or glabrous abaxially, margins ciliate; leaflets 17–39+, blades oblong to lanceolate or elliptic, 1.5–22 × 1–6 mm, apex acute or obtuse, surfaces pilose or glabrous, often glandular. |
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Racemes | 6–10-flowered, subcapitate, slightly elongate in fruit. |
3–19+-flowered, dense or nearly capitate. |
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Peduncles | erect or ascending, 4–15 cm, spreading-villous; bract lanceolate, shorter to longer than calyx, villous, margins ciliate. |
1–27 cm, axis 0.5–19 cm in fruit, hirsute, pilose, or villous-pilose, hairs spreading; bract lanceolate to lanceolate-linear, shorter than or surpassing calyx, glandular or glabrous, margins ciliate. |
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Corollas | yellowish, keel tip not maculate, 13–17 mm. |
whitish, yellowish, ochroleucous, lilac, purple, bluish, or pink-purple, keel tip maculate or not, (9–)11–18(–21) mm. |
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Calyces | short-cylindric, villous, hairs intermixed black and white; tube 5–6 mm, lobes 1.5–3.2 mm. |
cylindric to shortly so, villous, hairs black and white; tube 4–7 mm, lobes 1–5(–8) mm, usually glandular. |
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Legumes | erect, sessile or subsessile, ovoid-ellipsoid, 15–21 × 5–7 mm, length less than or equal to 3 times width, partially bilocular, papery, sulcate adaxially, pilose, hairs black and white. |
mostly erect, sessile, ovoid to subcylindric, 8–21(–30) × 4–7 mm, bilocular or incompletely so, glandular, strigose to pilose. |
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2n | = 96. |
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Oxytropis maydelliana |
Oxytropis borealis |
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Phenology | Flowering late spring–summer. | |||||||||||||||||
Habitat | Arctic and alpine tundra, heathlands, alluvial sands, gravels, dry rocky slopes. | |||||||||||||||||
Elevation | 0–1900 m. (0–6200 ft.) | |||||||||||||||||
Distribution |
AK; BC; NT; NU; QC; YT; e Asia (Chukotsk, Kamchatka) |
North America; Asia
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Discussion | Oxytropis maydelliana has yellowish flowers and reddish brown stipules, which easily characterize this arctic species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 5 (5 in the flora). Considerable confusion has existed over typification of Oxytropis borealis (S. L. Welsh 1990). The relationships of this species with several Eurasian taxa in sect. Gloeocephala Bunge are not well understood (R. C. Barneby 1952b). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||||||||||||||
Parent taxa | Fabaceae > subfam. Faboideae > Oxytropis | Fabaceae > subfam. Faboideae > Oxytropis | ||||||||||||||||
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Subordinate taxa | ||||||||||||||||||
Synonyms | O. campestris var. glabrata, O. campestris var. melanocephala, O. maydelliana subsp. melanocephala | |||||||||||||||||
Name authority | Trautvetter: Fl. Terr. Tschukt., 16. (1878) | de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prodr. 2: 275. (1825) | ||||||||||||||||
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