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maydell's locoweed, maydell's oxytrope

Habit Plants cespitose, appearing acaulescent.
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.

Racemes

6–10-flowered, subcapitate, slightly elongate in fruit.

Peduncles

erect or ascending, 4–15 cm, spreading-villous;

bract lanceolate, shorter to longer than calyx, villous, margins ciliate.

Corollas

yellowish, keel tip not maculate, 13–17 mm.

Calyces

short-cylindric, villous, hairs intermixed black and white;

tube 5–6 mm, lobes 1.5–3.2 mm.

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.

2n

= 96.

Oxytropis maydelliana

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
from FNA
AK; BC; NT; NU; QC; YT; e Asia (Chukotsk, Kamchatka)
[BONAP county map]
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.)

Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Oxytropis
Sibling taxa
O. arctica, O. besseyi, O. borealis, O. campestris, O. deflexa, O. huddelsonii, O. kobukensis, O. kokrinensis, O. lagopus, O. lambertii, O. mertensiana, O. multiceps, O. nana, O. nigrescens, O. oreophila, O. parryi, O. podocarpa, O. riparia, O. scammaniana, O. sericea, O. splendens
Synonyms O. campestris var. glabrata, O. campestris var. melanocephala, O. maydelliana subsp. melanocephala
Name authority Trautvetter: Fl. Terr. Tschukt., 16. (1878)
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