Leptocarpi 270 



low, triangular-apiculate. Flowers palo or purple-tipped, arched. 

 Banner rather obcordate, a little longer than keel and equaled by the 

 wings or oval and 2 mm. longer than wings. Wings obovate, about 

 as long as keel or a little more, entire. Keel with straight base, 

 then rounded to erect or a little more, the tip either triangular- 

 acuminate or deltoid or rarely obtuse, erect, 2-4 mm. high. Calyx 

 tube acute at base, not gibbous, 1-2 mm. long, the teeth subulate 

 unequal, and as long. Bracts ovate, minute; pedicels very short. 

 Peduncles very short to 3 times as long as leaves, filiform. Leaves 

 sparse, all petioled, 2-5 cm. long. Leaflets in the type about .5 pairs 

 and oval to elliptical, rounded, rarely acutish, mostly notched, con- 

 tiguous, rather smooth above, usually about 7 mm. long, rarely 1 

 cm. or 2 m)n. long. Stipules lanceolate. Delicate and filiform 

 stemmed plants from a few inches to 2 ft. long, freely bi-anched 

 below, prostrate. Common from the Pacific coast to the Plains 

 of Colorado throughout the Great Basin and southward to central 

 Mexico, on sandy plains. Lower Temperate and Tropical life zone. 

 Blooming throughout the season, sometimes a winter annual. A. 

 subuniflorus, Greene, is probably the same. 



Astragalus Nuttaliianus var. trichocarpus T. & G. Fl. 1 334 

 (1838). A. trichocarpus (T. & G.) Young. This differs from the 

 type in having the whole plant even to the pods villous with spread- 

 ing hairs. Low annual mostly. Peduncles short. Leaflets .5-7 pairs, 

 at least obtuse. Flowers about 4 mm. long. Keel much shorter 

 than the banner, tip incurved and acute to obtuse, the annual forms 

 have decidedly pointed keel. This is more common in Texas and 

 New Mexico. 



Astragalus Nuttaliianus var. enneajugus Jones Cont. 8 22 

 (1898). Pods arched most below, 2 cm. long, 2.5 mm. high, much 

 flattened laterally, smooth, ascending. Flowers several, about 7 mm. 

 long, in a head in both flower and fruit. Calyx tube 1.5 mm. long, 

 teeth filiform-subulate, nearly double the tube. Peduncles shorter 

 than the leaves in fruit or longer in flower. Leaflets at least on the 

 upper leaves 9-10 pairs, oblong, emarginate, not over 1.5 cm. long. 

 Rooust plants, leafy, 1-1 Vo ft. high. Stipules conspicuous, 4 mm. 

 long, adnate. Texan prairies. 



Astragalus Nuttaliianus var. quadrilateralis Jones Cont. 8 22 

 (1898). Pods congested at tips of peduncles, smooth, gently arcu- 

 ate, 2 mm. high, 2.5 cm. long, quadrilateral, shallow-sulcate at both 

 sutures, sides rather concave, tip ascending and sharply acute. Flow- 

 ers 3-6. Peduncles longer than the leaves to twice as long in fruit, 

 5-10 cm. long. Leaflets 6-7 pairs, oblong, emarginate, not over 1 

 cm. long. Plants rather stout and with large leaves, erect, annual, 

 1 ft. high. Arkansas and Oklahoma. 



Astragalus Nuttalianus var. leptocarpoides JoneS Cont. 8 22 

 (1898). Pods few, widely spreading, equally arched, not over 1.5 

 mm. high, 2.5-3 cm. long, somewhat flattened laterally, smooth, ven- 

 tral suture not depressed, cross section triangular, tip barely acute, 

 apiculate. Flowers rather large, 7-10 mm. long. Calyx lobes 

 barely as long as tube. Peduncles longer than the leaves, 5-8 

 cm. long and slender. Leaflets about 8 pairs, 5-10 mm. long, emar- 

 ginate, oblong-elliptical. Widely spreading to prostrate and slen- 

 der plants. Seeds many. Prairies, Galveston Island, Texas. 



Astragalus Nuttaliianus var. Cedrosensis (V. & R. Cont. Nat. 

 Herb. 1 15 (1893) as species). A. pertenuis Greene. A starved form 

 with about 3 pairs of deltoid-cuneate leaflets 2-4 mm. long and 

 notched. Flowers 1-3. Caiyx hemispherical. Pods 10-12 mm. long, 

 narrowly oblong, equally arched, acute, 2 mm. high, smooth. Cedros 

 Island Lower California, Palmer, No. 692. 



241. Astragalus acutirostris Watson Proc. Am. Acad. 20 360 

 (1885). A. streptopus Greene. Oxytropis Jones. Aragallus Heller. 

 Pods almost completely 2-celled, acute at both ends and almost stipi- 

 tate, becoming smooth with age, horizontal or a little reflexed. 



