Astragalus serenoi (Kuntze) E.Sheld.
-
Authors
Rupert C. Barneby
-
Authority
Barneby, Rupert C. 1964. Atlas of North American Astragalus. Mem. New York Bot. Gard. 13(1): 1-596.
-
Family
Fabaceae
-
Scientific Name
-
Type
"West Humboldt Mountains, Nevada; 5000 feet altitude; May, June. 280."—Holotypus, collected in 1868, US! isotypi, GH, NY!
-
Description
Deprecated: mb_convert_encoding(): Handling HTML entities via mbstring is deprecated; use htmlspecialchars, htmlentities, or mb_encode_numericentity/mb_decode_numericentity instead in /home/emu/nybgweb/www-dev/htdocs/science-dev/wp-content/themes/nybgscience/lib/VHMonographsDetails.php on line 179
Species Description - Commonly robust, with a woody, pluricipital taproot, strigulose with appressed, flattened, straight hairs up to 0.3-0.5 mm. long, the stems thinly so, the herbage greenish or cinereous, the leaflets more densely pubescent above than beneath, commonly silvery-canescent; stems several or numerous, erect and ascending in bushy clumps, 1.5-4.5 dm. long, simple and leafless at base, paniculately 1-several-branched from the lower and median leafy nodes (exceptionally simple), zigzag distally; stipules 1.5-5 mm. long, the lowest papery-scarious, mostly ovate and obtuse, semi- or almostly fully amplexicaul-decurrent, the median and upper ones progressively smaller, deltoid or triangular-acuminate, with subherbaceous, spreading or commonly deflexed blades; leaves 2-15 cm. long, shortly petioled, with stiff, often divaricate, or deflexed and distally incurved rachis and (1) 5-11 distant, linear, linear-oblanceolate, or filiform, rarely lanceolate, acute or subacute and often mucronate, flat or folded leaflets 5-30 mm. long, those of the uppermost leaves usually much reduced in size or lacking, and the terminal one obscurely differentiated from or confluent with the rachis; peduncles stout, erect, 3-25 cm. long; racemes loosely, at length distantly (3) 5-25-flowered, the flowers ascending, the axis becoming 2-20 cm. long in fruit; bracts submembranous, ovate or lance- acuminate, 1.5-4.5 mm. long; pedicels narrowly ascending, straight, at anthesis slender, 0.7-2 (2.4) mm. long, in fruit thickened, 2-4 mm. long; bracteoles nearly alway 2; calyx 7.9-13.7 mm. long, strigulose with black or largely black hairs, the turbinate or turbinate-campanulate, slightly oblique disc 1.4-2.5 mm. deep, the tube varying from cylindro-campanulate to narrowly cylindric, the lance- subulate teeth 1.5-4.3 mm. long, the ventral pair usually broadest and shortest, the orifice oblique, the whole becoming scarious, fragile, irregularly circumscissile; petals of various colors (cf. infra); banner gently recurved through 35-45°, oblanceolate, rhombic, or rhombic-oblanceolate, shallowly notched, 14.5-26 mm. long, 6.4-12 mm. wide; wings shorter, with narrowly oblong or oblong-oblanceolate, obtuse or suberose, straight or slightly incurved blades; keel again shorter, 12.8-18.5 mm. long, the lunately half-elliptic blades gently incurved through 70-85 (90)° to the rounded apex; anthers 0.6-0.75 mm. long; pod erect, sessile, obliquely ovate or plumply oblong in outline, 1.5-3 cm. long, 5-9 (10.5) mm. in diameter, obtuse or truncate at base, abruptly cuspidate at apex, straight or a little incurved, when first formed subterete but becoming a trifle compressed either laterally or dorsiventrally in ripening, the green, fleshy, glabrous, lustrous valves shrinking to expose the prominent, cordlike sutures, finally becoming stramineous, woody, transversely rugulose-reticulate and wrinkled lengthwise, inflexed as a narrow, partial or sometimes subobsolete septum up to 2.5 (3.2) mm. wide; dehiscence primarily apical, through the gaping beak and half-way down through the ventral suture, also tardily splitting to the base through the dorsal suture and the exocarp exfoliating from the endocarp to expose the separated outer walls of the septum; ovules 29—42; seeds olivaceous or orange-brown, sometimes purple- speckled, sparsely pitted but somewhat lustrous, 2.4-3.3 mm. long.