Astragalus praelongus E.Sheld. var. praelongus
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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
"Near St Thomas, S. E. Nevada, at the confluence of the Muddy River with the Virgen, Dr. Palmer, 1877."-Holotypus, Palmer 112 in 1877, GH! isotypi, K, NY, P, US!
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Synonyms
Astragalus procerus A.Gray, , , Phacopsis praelongus (E.Sheld.) Rydb., Rydbergiella praelonga (E.Sheld.) Fedde & P.Syd., Jonesiella praelonga (E.Sheld.) Rydb., Astragalus rothrockii E.Sheld., Jonesiella rothrockii (E.Sheld.) Rydb., Jonesiella recedens Rydb., Astragalus recedens Ced.Porter, Jonesiella mearnsii Rydb.
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Description
Variety Description - Calyx-teeth variable in length, deltoid to lance-subulate, 0.3-4.7 mm. long; pod 2—3.8 (4.2) cm. long, (9) 10—15 mm. in diameter, either sessile or abruptly contracted at base into an obconic stipe or stipelike neck up to 2.5 mm. long, either truncate or rounded, or broadly turbinate at base, broadest below, at, or above the middle, subsymmetric or decidly asymmetric in profile, if the latter then the dorsal suture the more strongly convex, the valves either glabrous or puberulent.
Distribution and Ecology - Gullied bluffs, sandstone escarpments, clay knolls, and sandy or sandy clay plains and bottomlands, in selenium-rich soils derived from sandstone, shale, or more rarely limestone or volcanic tuff, 2750-7100 feet, widespread and locally common from the Muddy and Virgin Valleys in southeastern Nevada and southwestern Utah, south to the Grand Canyon and the upper Verde Valley in Arizona, thence east across Arizona north of the Mogollon Escarpment to the headwaters of the San Juan River in southwestern Colorado, and south in New Mexico west of the Rio Grande to the head of the Gila River in Grant County.—Map No. 73.—April to July, the fruit often persisting over winter on withered stems.
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Discussion
The principal types of variation I have observed in the flowers and fruits of the stinking milk-vetch, var. praelongus, have been discussed in an introductory note to the species and are implicit in the description and synonymy. A minor variant associated with normal plants on the badlands of the Virgin Valley in Washington County, Utah, has pinkish-lavender flowers.
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Objects
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Distribution
Arizona United States of America North America| Utah United States of America North America| Nevada United States of America North America| New Mexico United States of America North America| Colorado United States of America North America|