The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links
Photo is of parent taxon

Laxmann's milk-vetch, standing milkvetch, tanana milkvetch

Photo is of parent taxon

ascending purple milk-vetch, prairie milkvetch, standing milk-vetch

Leaves

(2–)4–10 cm;

leaflets (7–)11–17, blades (4–)7–25 mm.

4–17 cm;

leaflets (9 or)11–25, blades (4–)8–27(–33) mm.

Racemes

10–20-flowered;

axis 1–3.5 cm in fruit.

(7–)16–50-flowered;

axis (0.6–)1.5–9(–13) cm in fruit.

Peduncles

4–12 cm.

(3–)4–14(–16.5) cm.

Flowers

11.5–16.2 × 4.5–6.6 mm;

calyx 5.6–6.8 mm, tube 4.6–5.7 × 3–3.8 mm, lobes subulate, 0.4–1(–2.1) mm;

corolla white.

13–19.5 × 4–7(–8) mm;

calyx 5.8–10.5 mm, tube (4–)4.4–7 × (2–)2.3–3.2 mm, lobes subulate or subulate-setaceous, 1.4–4.2 mm;

corolla magenta-purple, reddish lilac, dull blue, pale milky white.

Legumes

narrowly oblong or oblong-ellipsoid, 6–12 × 2.5–4 mm, densely strigulose, hairs black and relatively short, with ascending, white, straight, longer ones;

stipe 0.7–1.8 mm.

narrowly ovoid-, oblong-, or lanceoloid-ellipsoid, 7–12 × 2.3–3.8 mm, densely strigulose, hairs short and sinuous mixed with longer and straight ones, white or mixed with black;

stipes 0–0.5 mm.

Seeds

(9–)12–16(–18).

9–14(–16).

2n

= 32.

Astragalus laxmannii var. tananaicus

Astragalus laxmannii var. robustior

Phenology Flowering Jun–early Aug. Flowering May–Aug.
Habitat Shaley river bluffs, shingle bars, pebbly banks of streams, on disturbed gravelly or sandy soils near highways, airfields, or beaches, dry grassy meadows, hillsides. Plains, prairies, dry hillsides, on bare, rocky or gravelly areas on gravelly or shingly lakeshores or riverbanks, on sedimentary bedrock.
Elevation 100–800 m. (300–2600 ft.) 200–2000(–3400) m. (700–6600(–11200) ft.)
Distribution
from FNA
AK; YT
[BONAP county map]
from FNA
CO; IA; ID; MN; MT; ND; NE; NM; SD; UT; WA; WY; AB; BC; MB; NT; ON; SK; YT
[BONAP county map]
Discussion

Variety tananaicus is known mostly from the Yukon River drainage in southern Yukon and east-central Alaska.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

R. C. Barneby (1964) reviewed, partly in tabular form, the extensive synonymy associated with the widespread var. robustior. Some of the variants may ultimately be found to be worthy of taxonomic recognition.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Onobrychoidei > Astragalus laxmannii Fabaceae > subfam. Faboideae > Astragalus > sect. Onobrychoidei > Astragalus laxmannii
Sibling taxa
A. laxmannii var. robustior
A. laxmannii var. tananaicus
Synonyms A. tananaicus, A. adsurgens subsp. viciifolius A. adsurgens var. robustior, A. adsurgens subsp. robustior, A. striatus
Name authority (Hultén) Barneby & S. L. Welsh: Great Basin Naturalist 56: 85. (1996) (Hooker) Barneby & S. L. Welsh: Great Basin Naturalist 56: 85. (1996)
Web links