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maydell's locoweed, maydell's oxytrope

boreal crazyweed, boreal locoweed, Nuttall's oxytrope, sticky crazyweed

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.

Racemes

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

3–19+-flowered, dense or nearly capitate.

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.

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.

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.

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.

2n

= 96.

Oxytropis maydelliana

Oxytropis borealis

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]
from USDA
North America; Asia
[WildflowerSearch map]
[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.)

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.)

Key
1. Racemes subcapitate or nearly so, 5–10-flowered; wing petal blades dilated distally to 3.5–5 mm; leaflets (17 or)19–27(–37).
var. borealis
1. Racemes elongate, or subcapitate and elongating in fruit; wing petal blades not especially dilated distally, 2–3 mm, or if wider, then inflorescence not subcapitate; leaflets 17–39+.
→ 2
2. Peduncles 2.5–7 cm; calyx lobes 1–1.5 mm, not or obscurely tuberculate.
var. hudsonica
2. Peduncles (1–)4–27 cm; calyx lobes 1–4(–4.5) mm, prominently tuberculate.
→ 3
3. Corollas white or bluish, keel tips maculate; inflorescence axis often (2–)3–15 cm in fruit; se continental Alaska, n British Columbia, s Yukon.
var. sulphurea
3. Corollas white, ochroleucous, pink-purple, lilac, or yellowish, keel tips maculate or not; inflorescence axis often (1.5–)4–19 cm in fruit; Alaska to n, nc United States.
→ 4
4. Corollas pink-purple, lilac, whitish, or yellow; leaflet blades not thick or stiff; plants glandular.
var. viscida
4. Corollas usually white or ochroleucous, rarely fading bluish; leaflet blades thick and stiff; plants markedly viscid.
var. australis
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Oxytropis 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
O. arctica, O. besseyi, O. campestris, O. deflexa, O. huddelsonii, O. kobukensis, O. kokrinensis, O. lagopus, O. lambertii, O. maydelliana, O. mertensiana, O. multiceps, O. nana, O. nigrescens, O. oreophila, O. parryi, O. podocarpa, O. riparia, O. scammaniana, O. sericea, O. splendens
Subordinate taxa
O. borealis var. australis, O. borealis var. borealis, O. borealis var. hudsonica, O. borealis var. sulphurea, O. borealis var. viscida
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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