344 LEGUMINOSAE 



Sterna 1 to 3 feet high, not tufted; perennials; upper San Joaquin Valley, inner South Coast 

 Range and coastal S. Cal. 



Pods acuminate at base and at apox; calyx-tube cylindric 4. A. oxyphysus. 



Pods rounded at base or obscurely acute, abruptly and shortly acute at apex; calyx-tube 

 campanulate or cylindric 5. A. leucopsis. 



g. Pods not stipitate. 

 Perennials. 



Pods glabrous or sparsely pubescent. 



Seed-bearing suture somewhat intruded; stipules distinct. 



Pods 5 to S lines long; west side Colorado Desert 6. A. vaseyi. 



Pods 1 to 1% inches long. 



Pods ovoid, gradually acute at apex, barely 1 inch long; S. Cal 



7. A. crotalariae. 



Pods oblong-ovate, abruptly acute at apex, 1 to 2 inches long; mostly South 



Coast Ranges and cismontane S. Cal. 



Racemes loose or moderately dense, 7 to 9 lines wide; flowers ascending 



or spreading; banner at apex strongly upturned, commonly at a 



right angle 8. A. douglasii. 



Racemes dense, 11 to 13 lines wide; flowers spreading, at length deflexed; 



banner at apex not markedly upturned 9. A. pomonensis. 



Seed-bearing suture not intruded. 



Stipules meeting or united on opposite side of stem from leaf; leaflets crowded; 



coastal from San Francisco south 10. A. vestitus. 



Stipules distinct; leaflets not crowded; Colorado Desert 11. A. preussii. 



Pods rather densely pubescent. 



Stems 3 to 8 inches long; leaves % to 1% inches long; ne. Cal 12. A. pulsiferae. 



Stems 1 to 4 feet long ; leaves 3 to 6 inches long. 



Pods oblong, 1 inch long; Monterey and San Luis Obispo Cos 13. A. macrodon. 



Pods ovate, ^> inch long ; upper San Joaquin Valley and San Bernardino Valley 



14. A. hornii. 

 Annuals. 



Pods strigulose ; Inyo Co 15. A. triflorus. 



Pods densely pubescent or hoary; Colorado Desert. 



Pods broadly ovate, 41/^ lines wide; branches spreading from base 16.^. sabulonum. 



Pods narrowly ovate, 2% lines wide; branches ascending 17. A. aridus. 



II. Pods completely or incompletely 2-celled. 



Flowers racemose ; plants 4 inches high or more. 

 Pods not stipitate. 



Pods not strictly globose, attenuate or tapering to apex. 



Pods lanceolate, somewhat obcompressed, incompletely 2-celled; biennial 



18. A. agninus. 

 Pods ovate, markedly inflated, often purplish- or brown-mottled ; perennial, biennial 



or annual; mainly deserts and east side of Sierra Nevada 



19. .4. leniiginosus. 

 Pods globose, abruptly beaked by the stout persistent style; perennial; Mt. Whitney 



plateau 20. A. Tcernensis. 



Pods stipitate, ovate, inflated, 7 to 10 lines long; perennial; Sierra Nevada.. 21. A. bolanderi. 



blowers in small heads ; plants 2 to 3 inches high ; pods incompletely 2-celled, sessile ; perennial ; 



high Sierra Nevada 22. A. platytropis. 



B. Pods not at all inflated or only weakly so. 



I. Perennials (no. 27 a biennial). 



1. Pods resembling pellets of wool, densely white-woolly or white-villous, ^2 to 1^2 inches long. 



Corolla crimson, 1^4 to 1% inches long; pods broadly oblong, curved, 1 to IV^ inches long; 



peduncles equaling or exceeding the leaves; deserts 2^. A.coccineus. 



Corolla white, or blue or purple and white, 7 to 11 lines long; peduncles usually shorter than the 

 leaves; pods more or less curved, or more or less obcompressed, 6 to 12 lines long. 

 Leaves densely villous or white-tomentose. 



Sierra Nevada (east side mainly), inner Coast Range, San Bernardino Mts. ; pods 

 commonly 1-celled, not usually grooved on back ; plants matted, the peduncles 

 and leaves arising from the branched root-crown, or sometimes borne on short 



stems 24. A. purshii. 



High montane axis of Southern California; pods 2-ceUed, strongly grooved on back; 

 plants caespitose 25. A. leucolobus. 



