Monographs Details: Astragalus insularis var. quentinus M.E.Jones
Authors:Rupert C. Barneby
Authority: Barneby, Rupert C. 1964. Atlas of North American Astragalus. Mem. New York Bot. Gard. 13(2): 597-1188.
Family:Fabaceae
Description:Variety Description - More densely pubescent than var. insularis, the herbage greenish-cinereous, the leaflets glabrous above; stems 0.6-2.5 dm. long; leaflets (7) 11-19, narrowly elliptic, acute; pod (0.9) 1.1—1.8 cm. long, (7.5) 10-14 mm. in diameter, subsymmetrically ovoid or subglobose, the beak very short and obscure, 1-2.5 mm. long, the funicular flange 0.3-0.5 mm. wide.

Distribution and Ecology - Sandy plains, alkaline flats, stony washes, and openings in coastal scrub, sometimes on burns, 10—600 feet, locally plentiful but known only from San Quintín Bay and south to the north edge of the Viscaino Desert, on the Pacific side of the Baja California peninsula in lat 30°-30° 50' N.—Map No. 116.— February to April.

Discussion:The San Quintínin milk-vetch, var. quentinus, differs from other forms of A. insularis in its subsymmetrically ellipsoid or almost globose, obscurely beaked or almost beakless pod, and from var. insularis (with which it has in common leaflets acute and glabrous above) in being more densely pubescent, with ashen rather than deep green foliage. The pod greatly resembles that of A. Wootoni in outline, but the plants may be distinguished from all phases of that species by their acute leaflets and short calyx-teeth; in addition, the pod is of thinner texture, speckled with reddish-purple, and mostly 8-10- rather than 12-20-ovulate. There can be no doubt that its immediate relationship lies with A. insularis, as Jones clearly realized, and not with the allopatric Candolleanae of Phaca with which Rydberg associated it (1929, p. 351) under the title of P. Pondii. It so happens that the isotypus of var. quentinus most readily available to Rydberg (that at NY) is an uncommonly robust sample of the variety, and might be interpreted as a short-lived perennial. However, other material from San Quintín Bay and nearby Socorro show that the plants are normally fleeting annuals of three or four months duration.
Distribution:Baja California Mexico North America|