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Astragalus accidens var. accidens
Astragalus accidens S. Watson var. accidens
Rogue River Milkvetch
Fabaceae (Pea family)
Synonym(s):
USDA Symbol: ASACA2
USDA Native Status: L48 (N)
"Tall, diffuse, leafy perennials, with loosely forking caudex, villosulous nearly throughout with loosely ascending-incurved or somewhat curly hairs up to 0.5-0.8 (0.9) mm. long, the stems commonly stramineous and glabrescent, the herbage green or gray-green, the leaflets glabrous or thinly pubescent above; stems decumbent and weakly ascending, commonly numerous and radiating, 3-5.5 dm. long, leafless at base, simple or bearing spurs or branches at 1-3 nodes preceding the first peduncle, the whole composed of ± 8-12 developed internodes." (bibref: 1813).
"The Rogue River milk-vetch, A. accidens, is a coarse, weak-stemmed, sprawling and leafy astragalus, remarkable for its fleshy, stipitate pods, but it is easily identified even in the flowering stage. In its area of dispersal, where the genus is not highly developed, it could be confused only with the marginally sympatric A. (Miselli) umbraticus; but the latter is nearly glabrous below the black-strigulose (not villosulous) infloresence and has decidedly smaller flowers, from which develop subsessile, incurved, compressed-triquetrous pods." (bibref: 1813).
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Plant Characteristics
Duration: PerennialHabit: Herb
Leaf Arrangement: Alternate
Fruit Type: Legume
Size Notes: "Stems 3-5.5 dm. long." (bibref: 1813).
Leaf: "Stipules 3-6 mm. long, the lowest papery-membranous or early becoming so, ovate, decurrent around more or less half the stem's circumference, the median and upper ones narrower, deltoid or triangular-acuminate, green but thin-textured, commonly reflexed, the margins ciliate and often beset with a few minute, tack-shaped processes, leaves widely ascending or some refracted, (3) 5-12 cm. long, the uppermost subsessile, with 23-29 lance-oblong, oblong, or oblong-elliptic, nearly always emarginate or retuse, flat leaflets 6-22 mm. long, glabrous above." (bibref: 1813).
Flower: "Peduncles mostly a little shorter than, sometimes equaling the leaf, 4.5-10.5 cm. long, incurved-ascending at anthesis, commonly weighed down by the heavy fruits, racemes 7-15- flowered, the axis a little elongating, 1.5-7.5 cm. long in fruit; bracts membranous, triangular-lanceolate, 1.5-3.3 mm. long; pedicels 1.5-3.3 mm. long, at anthesis ascending, straight or nearly so, in fruit scarcely or no longer, a little thickened, arched outward; bracteoles usually 2, often conspicuous, rarely 0, calyx 6-9.4 mm. long, villosulous with black, fuscous, or sometimes largely white hairs, the somewhat oblique disc 1.3-2 mm. deep, the tube 4.2-5.5 mm. long, 3 4.5 mm. in diameter, the broadly subulate teeth 1.7-4 mm. long, the ventral pair commonly broadest and shortest, the orifice oblique, the whole becoming papery, marcescent unruptured; petals whitish, drying ochroleucous or yellowish; banner broadly rhombic or rhombic-obovate, notched, 13.8-19.3 mm. long, 7.6-9.5 mm. wide; wings 12.1-15.8 mm. long, the claws 4.5-5.8 mm., the linear-oblong or oblanceolate, obtuse but erose or subemarginate, gently incurved blades 8.3-11.9 mm. long, 2.3-3.5 wide; keel 9.5-12.3 mm. long, the claws 4.6-5.7 mm., the lunately half- obovate or obliquely triangular blades 5.2-7.4 mm. long, 2.5-3.4 mm. wide, incurved through 85-100 degrees to the bluntly deltoid apex; anthers (0.4) 0.45-0.7 mm. long." (bibref: 1813).
Fruit: "Pod loosely pendulous (often humistrate and hence variably oriented), loosely strigulose with incurved hairs up to 0.25-0.35 mm, stipitate, the slender stipe 5-8 mm. long, the body plumply oblong-ovoid or half- ovoid, 1-1.6 cm. long, (4) 4.5-7 mm. in diameter, abruptly contracted at both ends, beaked with a sharp, subulate, subpungent cusp, subterete and solid when first formed, becoming a little compressed laterally and bicarinate by the cordlike ventral and narrower, undulate dorsal sutures, the smooth, green, fleshy valves becoming stiffly leathery or woody, brownish-stramineous, coarsely rugulose-reticulate, inflexed as a complete septum nearly as broad as the pod's diameter; seeds (seldom seen) brown, sometimes purple-dotted, smooth or sparsely pitted, dull, 2.6-3.5 mm. long, the fruits deciduous and remaining long unopened on the ground." (bibref: 1813).
Bloom Information
Bloom Color: White , YellowBloom Time: Apr , May , Jun , Jul
Bloom Notes: "Petals whitish, drying ochroleucous or yellowish." (bibref: 1813).
Distribution
USA: ORNative Distribution: "Local but forming extensive colonies on the upper forks of the Umpqua and the middle Rogue Rivers, southern Douglas and eastern Josephine Counties, Oregon." (bibref: 1813).
Native Habitat: "Dry hillsides in shade of oaks, in light gravelly soils rich in humus from decaying litter, 500-2500 feet." (bibref: 1813).
Bibliography
Bibref 1813 - Atlas of North American Astragalus (1964) Barneby, Rupert C.Search More Titles in Bibliography
Additional resources
USDA: Find Astragalus accidens var. accidens in USDA PlantsFNA: Find Astragalus accidens var. accidens in the Flora of North America (if available)
Google: Search Google for Astragalus accidens var. accidens
Metadata
Record Modified: 2021-02-12Research By: Joseph A. Marcus