Plant Database

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Plant Characteristics

Duration: Annual , Perennial
Habit: Herb
Leaf Arrangement: Alternate
Fruit Type: Legume
Size Notes: "Stems almost 0 up to 2 (7) cm. long." (bibref: 1814).
Leaf: "Stipules submembranous, triangular or lanceolate, 3-4 mm. long, more or less semiamplexicaul; leaves (2) 4-7 cm. long, with slender petiole and 11-17 (19) obovate-elliptic to broadly oblanceolate, mostly acute, rather distant and scattered, flat or loosely folded leaflets 3-7 mm. long." (bibref: 1814).
Flower: "Peduncles (3) 4-8 cm. long, incurved-ascending at anthesis, prostrate in fruit; racemes shortly but loosely 5-9 (12)-flowered, the flowers becoming horizontal or a trifle declined in age, the axis little elongating, 1-2.5 cm. long in fruit; bracts membranous, ovate- acuminate or lanceolate, 2-3.7 mm. long; pedicels ascending or a trifle arched outward, at anthesis 0.5-0.8 mm., in fruit 0.6-1 mm. long, apparently disjointing in age; bracteoles 0; calyx 5.3-6.6 mm. long, strigulose with white or some black hairs, the somewhat oblique, turbinate disc 0.8-1.1 mm. deep, the campanulate, submembranous, purplish tube 3.4-4.2 mm. long, 2.4-2.9 mm. in diameter, the subulate teeth 1.8-2.5 mm. long, the whole marcescent unruptured; petals pink- purple, drying bluish, the pale lozenge in the banner prominently purple-veined; banner recurved through about 45 degrees (or ultimately 90 degrees), 10.3-13.4 mm. long, the narrowly cuneate claw abruptly expanded into an oblong-obovate, deeply notched blade 6.5-9 mm. wide; wings 9.4-11.8 mm. long, the claws 3.2-4.1 mm., the narrowly oblong-oblanceolate or linear-oblong, subtruncate or emarginate, lunately incurved blades 7.2-8.6 mm. long, 1.8-2.5 mm. wide; keel (0.2 mm. shorter to 0.4 mm. longer than the wings) 9.8-11.5 mm. long, the claws 3.2-4.1 mm., the obliquely obovate or half-obovate blades 6.5-8 mm. long, 3-3.5 mm. wide, abruptly incurved through 95-100 degrees to the broadly rounded apex; anthers 0.450.65 mm. long." (bibref: 1814).
Fruit: "Pod loosely spreading or incurved-ascending (humistrate), readily deciduous, narrowly and very obliquely ellipsoid, 1.5-2 (2.5) cm. long, 4-6 mm. in diameter, lunately incurved through the lower 3/4 and then abrutly hamate- incurved distally, acuminately tapering and laterally compressed at both ends, cuspidate at apex, otherwise obcompressed, ventrally carinate by the gently concave suture, the convex dorsal suture also prominent but depressed at the middle and lying in a double groove, the somewhat fleshy, densely strigulose, unmottled valves becoming leathery, brownish, transversely reticulate, not inflexed; dehiscence apical, after falling, seeds unknown." (bibref: 1814).

Bloom Information

Bloom Color: Pink , Purple
Bloom Time: Apr , May , Jun
Bloom Notes: "Petals pink- purple, drying bluish, the pale lozenge in the banner prominently purple-veined." (bibref: 1814).

Distribution

USA: AZ , NV
Native Distribution: "Locally plentiful but known only from the desertic foothills of the Sheep Mountains, in the Desert Game Refuge, Clark County, Nevada." (bibref: 1814).
Native Habitat: "Dry hillsides in limestone gravel, ± 5300-5600 feet." (bibref: 1814).

Bibliography

Bibref 1814 - Atlas of North American Astragalus Volume 2 (1964) Barneby, Rupert C.

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Additional resources

USDA: Find Astragalus amphioxys var. musimonum in USDA Plants
FNA: Find Astragalus amphioxys var. musimonum in the Flora of North America (if available)
Google: Search Google for Astragalus amphioxys var. musimonum