Monographs Details: Astragalus adsurgens Pall. var. adsurgens
Authors:Rupert C. Barneby
Authority: Barneby, Rupert C. 1964. Atlas of North American Astragalus. Mem. New York Bot. Gard. 13(2): 597-1188.
Description:Variety Description - Habit of the species; calyx 4.8-7.6 mm. long, the tube 3-4.4 mm. long, 2-2.9 mm. in diameter, the linear or linear-subulate teeth 1.4-3 mm. long, mostly separated by wide and obtuse sinuses; petals purple, slate-blue, milky-white, or white turning creamy; banner 11-17.2 mm. long, 4.5-7 mm. wide; wings 9.8-14 mm. long, the claws 4.1-6.7 mm., the blades 6-8.3 mm. long, 1.3-2.2 mm. wide; keel 8-11.3 mm. long, the claws 3.8-7 mm., the blades 4.5-5.5 mm. long, 2.2-2.7 wide; pod sessile or very shortly stipitate, the stipe less than 1 mm. long, the body ± 6-9 mm. long; ovules 10-16.
Distribution and Ecology - Widely dispersed over eastern Asia, from northeastern China through Mongolia to Altai, north in Siberia to the upper Irtysch and Lena Valleys; Japan.
Pallas described and figured A. adsurgens as having free stipules, and this character has been re-emphasized repeatedly, most recently by Borissova (1946, p. 508) and by Rechinger & al. (1958, p. 336—"stipulae semiamplexicaules"). It often happens that the stipular sheath, although fully amplexicaul in vernation, becomes ruptured in age, especially if situated at a node on the main stem, which increases rapidly in girth during the period of spring growth. However it is nearly always possible to find on a plant of A. adsurgens some unruptured sheaths; this is true of the plant in the Pallas herbarium.
The name A. adsurgens has often in the past (initially by DeCandolle, 1802, p. 123) been considered a later synonym of A. Laxmanni Jacqu. (Hort. Vindob. 3: 22, Tab. 37. 1776), a species based on plants grown in Vienna from seeds procured through Eric Laxmann. Pallas (1800, p. 36) claims to have sent the seeds to Laxmann, but the plant figured by Pallas (1800, Pl. 30) as A. Laxmanni is apparently not the genuine A. Laxmanni of Jacquin. According to Bunge (1869, p. 84) the true A. Laxmanni is a member of sect. Hypoglottis, a mesophytic species differing from all Onobrychoidei in its basifixed pubescence. In Flora U. R. S. S., A. Laxmanni is mentioned only as a sensu-name, in the synonymy of A. austrosibiricus Schischk. (a part of the A. adsurgens complex) and A. tibetanus Bth. ex Bge., despite its ostensibly Siberian origin. Probably A. Laxmanni is the earliest name for the widely dispersed and somewhat variable A. tibetanus, but its identity lies beyond the scope of this study. In early American literature the name A. Laxmanni refers to A. adsurgens var. robustior.
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