Oxytropis maydelliana |
Oxytropis besseyi |
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maydell's locoweed, maydell's oxytrope |
Bessey's locoweed |
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Habit | Plants cespitose, appearing acaulescent. | Plants cespitose, appearing acaulescent, herbage silky-pilose. | ||||||||||||||||||||
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. |
1.5–16 cm; stipules membranous or papery, light tan or pale gray, silky-pilose; leaflets 5–25, blades narrowly elliptic, lanceolate, or lanceolate-ovate, 4–21 × 1–4 mm, apex acute or obtuse, surfaces silky-pilose. |
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Racemes | 6–10-flowered, subcapitate, slightly elongate in fruit. |
3–22-flowered, subcapitate to loosely racemose in flower, sometimes slightly elongate in fruit. |
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Peduncles | erect or ascending, 4–15 cm, spreading-villous; bract lanceolate, shorter to longer than calyx, villous, margins ciliate. |
2–19 cm, axis 0.5–8(–10) cm in fruit, hairs appressed or some ascending; bract ovate-rhombic to lanceolate or lanceolate-acuminate, silky-pilose, margins ciliate. |
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Corollas | yellowish, keel tip not maculate, 13–17 mm. |
bright pink-purple, 17–25 mm, wing petals broadly expanded, often conspicuously 2-lobed apically. |
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Calyces | short-cylindric, villous, hairs intermixed black and white; tube 5–6 mm, lobes 1.5–3.2 mm. |
cylindric-campanulate, hispid-hirsute, silky-hairy, silky-pilose, or appressed-silky, hairs white; tube (5–)6–8(–9.5) mm, lobes 2–6 mm. |
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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. |
rupturing calyx but invested by it, erect or spreading, sessile or short-stipitate, stipe to 1.2 mm, cylindric, scarcely to strongly inflated or swollen, (5–)10–14(–20) × 2.5–10 mm, bilocular or semibilocular, papery, villous, hairs whitish, shiny, (1–)1.5–3 mm. |
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2n | = 96. |
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Oxytropis maydelliana |
Oxytropis besseyi |
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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) |
w North America
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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 6 (6 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. 11. | FNA vol. 11. | ||||||||||||||||||||
Parent taxa | Fabaceae > subfam. Faboideae > Oxytropis | Fabaceae > subfam. Faboideae > Oxytropis | ||||||||||||||||||||
Sibling taxa | ||||||||||||||||||||||
Subordinate taxa | ||||||||||||||||||||||
Synonyms | O. campestris var. glabrata, O. campestris var. melanocephala, O. maydelliana subsp. melanocephala | Aragallus besseyi | ||||||||||||||||||||
Name authority | Trautvetter: Fl. Terr. Tschukt., 16. (1878) | (Rydberg) Blankinship: Sci. Stud. Montana Coll. Agric., Bot. 1: 80. (1905) | ||||||||||||||||||||
Web links |