PEA FAMILY. 235 



A. Annuals. 

 Pods didymous, wrinkled, 2-seeded. 



Spikes capitate or oblong; pods erect, little exserted from the calyx. 1. A. dtdymocarpus. 



Spikes cylindrical; pods deflexed, well exserted from the calyx... 2. A. mgrescens. 



Pods not didymous, nor wrinkled, several-seeded; inflorescence capitate. 



Pods narrowly oblong, not beaked 3. A. truer. 



Pods with a stout body and long incurved beak 4. A. brewert. 



B. Perennials; pods \-cclled except no. 11. 

 Pods inflated or bladder-like and 



Stipitate. ^ , , ,, 



Stipe long and filiform; leaflets 21 to 31 5. A. leucophyllus. 



Stipe recurved, little exceeding the calyx; leaflets 9 to 21 6. A. oxyphysus. 



Sessile in the calyx. 



Peduncles mostly longer than the leaves; flowers spreading or deflexed. 



Flowers white; stipules distinct 7. A. crotalariae. 



Flowers yellowish white or greenish; stipules mostly united opposite the petiole; 



raceme often long 8. A. mcnzicsii. 



K Peduncles shorter than the leaves; flowers mostly erect, yellow or creamish; stipules 



distinct; raceme short 9. A. douglasii. 



Pods not inflated. 



Herbage hoary; racemes dense, 1 l A to 2 in. long; pods crowded, retrorsely imbricated, 



4 lines long 10. A. pyenostachys. 



Herbage nearly glabrous; racemes loose, 3 to 6 in. long; pods deflexed, 2 l / 2 lines long 



11. A. clevelandii. 



1. A. didymocarpus H. & A. Slender, 3 to 10 in. high, pubescent; leaf- 

 lets 9 to 15, narrowly oblong to linear and more or less cuneate, sharply 

 notched at apex, 3 to 5 lines long; spikes dense, capitate or oblong, 4 to 6 

 lines long, on long peduncles; flowers l 1 /, to 2% lines long, dull purplish; calyx 

 rather densely hirsute with black hairs; pod with a minute short scattered 

 pubescence, erect, 2 lines long and about as broad, scarcely exserted from the 

 calyx, strongly nerved transversely, so deeply 2-lobed lengthwise as to be 

 divided into 2 cells, the fruit therefore twin-like with 1 large seed in each cell. 



Low hills: Antioch and Kirker Pass southeastward to the head of the San 

 Joaquin Valley and westward to San Luis Obispo Co. Apr. 



2. A. nigrescens Nutt. Smaller and more slender than the last and less 

 pubescent ; flowers dull and commonly minute but sometimes large ; fruiting 

 spikes cylindrical, much less dense, 3 to 10 lines long; pods deflexed, well 

 exserted from the calyx, hirsute-pubescent, wrinkled and strongly obcom- 

 pressed. — (A. elmeri Greene.) 



Vaca Mts. ; Mt. St. Helena; Mt. Diablo; Berkeley; Marin Co. and south- 

 ward to Southern California. Also in the Sierra Nevada foothills. Apr. 



3. A. tener Gray. Slender, 4 to 9 in. high, minutely pubescent ; leaf- 

 lets 9 to 15, linear or cuneate, either acute or emarginate at apex; inflor- 

 escence capitate, the head 5 to 9-flowered; flowers purple and white, 5 lines 

 long; calyx with minute and short appressed brown hairs; pod silvery when 

 young, glabrous when mature, coriaceous, narrowly oblong, 8 lines long, some- 

 what incurved, 2-celled, 5 to 10-seeded; fruiting peduncle 2 in. long, at length 

 spreading, declined or even reflexed. 



Alkaline fields, mostly in moist places: Solano to Alameda cos. May. 



4. A. breweri Gray. Much like the preceding but smaller, relatively stouter 

 and the leaflets broader; heads 5 to 7 -flowered; pod 1-celled or nearly so, 

 the body short with a long incurved beak. 



Sonoma Valley to Mt. Tamalpais. 



5. A. leucophyllus T. & G. Stem erect, stoutish, 2 or 3 ft. high, the 

 growing parts silvery-canescent, glabrate and greenish in age; leaflets 21 to 

 31, narrowly oblong or linear, 6 to 10 lines long; raceme densely flowered and 

 long-peduncled ; flowers 6 to 8 lines long; calyx-teeth subulate, about % the 



