Didymocarpi. 284 



3A2B. Pods conspicuously longer than calyx, smooth, ribbed, 

 appearing a little inflated, inclined to be notched at both 

 ends, sessile, rather wider than long. Mexican perennials or 

 winter annuals with rather woody stems late in the season. 



Pods about round. 271 diphacus 



Pods oblately oval-ovate. 272 Angelinus. 



3A3B. Pods smooth, stipitate, reflexed. Texan. 



Pods about reniform. 273 Brazoensis. 



266. Astragalus reflexus T. & G. Fl. 1 334 (1838). Pocis 

 about 7 mm. long, oblong-ovate, sharply acute, about twice as long 

 as wide, widely sulcate dorsally, flat ventrally and with suture 

 raised, with rounded sides, smooth, 4 mm. \\'ide and 2 mm. high. 

 Flowers reflexed, purple, nearly sessile, several in a loose head, 

 about 7 mm. long. Banner narrow, arched abruptly at calyx tips to 

 erect, 2-3 mm. longer than keel. Wings much shorter than keel, 

 broad. Keel with straight base and then produced into a narrowly 

 triangular, ascending and very acute beak. Calyx tube about 1 

 mm. long, campanulate, acute at base, with broad sinuses and t§eth 

 subulate and about as long as tube. Bracts subulate, about 2 mm. 

 long. Pedicels evident but very short. Peduncles longer than the 

 leaves 3-6 cm. long. Leaves 3-6 cm. long, the uppermost nearly 

 sessile, the lowest half petiole. Leaflets about 6 -pairs, 4-8 mm. long, 

 about obovate, not contiguous, strongly petiolulate, truncate to a 

 little notched. Stems straggling, about a foot long or less. Stip- 

 ules rather large, 3-5 mm. long, ovate or broader. Whole plant 

 nearly smooth except the calyx. Central Texas. 



267. Astragalus nigrescens Nutt. PI. Gambel 152 (1848). 

 A. Gambellianus Sheldon. Hesperastragalus Heller. Pods 3-4 mm. 

 wide and long, deltoid-ovate to nearly round, pubescent, either del- 

 toid at tip or with a inere upturned apiculation, sharply sulcate dor- 

 sally, the ventral suture mostly elevated and the space between it 

 and the thickened sides forming deep grooves. Flowers normally 

 2-4 mm. long, very variable, white or purple, mostly scarcely open- 

 ing and rather cleistogamous as in Wrightii and lotiflorus, many in 

 heads but becoming spikes in fruit. Banner round to ovate, the 

 sides little or much reflexed, normally 1-3 mm. long, arched 45" 

 or less, as long as or 2 mm. longer than wings. Wings lanceolate- 

 oblong and narrowed above, rounded, white, somewhat arched, a 

 little longer than keel. Keel about 2 mm. long, with straight or 

 arched base, abruptly bent and tip erect and acutish, about 1 mm. 

 high, purple. Under specially favorable circumstances the flowers 

 are 7 mm. long and then the species is A. Elmeri Greene. Calyx 

 tube black-hairy, tux'binate to narrowly campanulate, acute at base, 

 hai-dly 1 mm. long, the teeth about half as long and rather deltoid. 

 Bracts hyaline, lanceolate, about 1 mm. long, pedicels mere rudi- 

 ments. Peduncles 3-5 cm. long, somewhat spreading. Fruiting 

 spikes 1-5 cm. long, narrow. Leaves 2-4 cm. long, thin, mostly 

 nearly sessile, ascending. Leaflets 4-6 pairs, cuneate-oblong, deeply 

 notched, long-petiolulate, 3-8 mm. long, distant. Stipules triangular, 

 hyaline, 3-5 mm. long. Whole plant pubescent with spreading 

 and long hairs. Stems seldom a foot long, much branched. Com- 

 mon from the Sacramento valley to the coast and south to Mexico, 

 also on the southern islands of California. 



268. Astragalus Breweri Gray Proc. Am. Acad. 6 207 (1864). 

 Pods few, oblong-ovate, ashy or silvery, 3-4 mm. wide, with ventral 

 suture not raised nor evident, sharply sulcate to the middle dorsally, 

 abruptly contracted at tip into a straight and subulate beak nearly 

 as long as body, few. Flowers purple, spreading. Banner very 

 thin, often 8 mm. long, oblong, arched abruptly at calyx tips to 45°, 

 with sides reflexed somewhat, about 2 mm. longer than wings. 

 Wings oblong-oblanceolate to half-rhomboidal, 2-3 mm. longer than 



