Astragalus curvicarpus var. brachycodon (Barneby) Barneby
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Authors
Rupert C. Barneby
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Authority
Barneby, Rupert C. 1964. Atlas of North American Astragalus. Mem. New York Bot. Gard. 13(1): 1-596.
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Family
Fabaceae
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Scientific Name
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Type
"Oregon: ... three miles north of Redmond, Deschutes Co., 2 July, 1942, M. E. Peck No. 21491."—Holotypus, WILLU! isotypus (fragm.), RSA!
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Synonyms
Astragalus whitedii var. brachycodon Barneby
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Description
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Variety Description - Similar to var. curvicarpus, the stems usually slender, 2-4 dm. long, the herbage strigulose with appressed, or loose and incurved, sometimes flattened hairs up to 0.25-0.4 mm. long, the leaflets pubescent on both sides but sometimes thinly so above; leaflets (9) 13-19 (21), 3-11 (15) mm. long; pedicels at anthesis 1-1.5 mm., in fruit 1.4-2.3 mm. long; calyx 6.1—8.5 (9.3) mm. long, the disc 0.9-1.3 mm. deep, the deeply campanulate or rarely cylindric tube 5.4-7.6 (8.6) mm. long, 2.9-3.5 (4.1) mm. in diameter, the teeth 0.4-1 mm. long; banner rhombic-oblanceolate, 13.6-15 (16.8) mm. long, 5.4-8.2 mm. wide, recurved through ± 45°; wings 11.5-14.2 (15.2) mm. long, the claws 5.5-7.4 (8.8) mm., the blades 6.4-8.1 mm. long, 2.3-3.3 mm. wide; keel 9.4-11.6 (12.3) mm. long, the claws 5.3-7 (7.9) mm., the blades 4.4-5.6 mm. long, 2.6-3.3 mm. wide; stipe of the pod 6-12 (15) mm. long, the body 1.4-2.2 cm. long, 3-4 (4.5) mm. wide, lunately incurved or hamate, glabrous; ovules 15-21; seeds (2) 2.3-3.1 mm. long.
Distribution and Ecology - Plains and hillsides, in rough basaltic gravel or pumice sand, 2800-3800 feet, locally plentiful on the upper forks of the Deschutes River in Crook, Jefferson, and Deschutes Counties, Oregon.—Map No. 28.—May to July.
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Discussion
The var. brachycodon is geographically intermediate between var. curvicarpus and var. subglaber and also morphologically so to the extent that it combines the relatively copious leaf- pubescence of the former with the (nearly always) glabrous pod of the latter. It differs from both in the smaller flowers, which are subject to some variation in length, and the largest slightly overlap the measurements recorded for var. curvicarpus. The blade of the banner is ordinarily well developed, as in var. curvicarpus, and not both shortened and abruptly replicate distally as is usual in var. subglaber and the closely related A. collinus. The calyx of the smallest flowers of var. brachycodon is scarcely tumid and obscurely saccate at base, sometimes only abruptly truncate, with the pedicel attached at right angles to the lower corner.
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Objects
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Distribution
Oregon United States of America North America|