PEA FAMILY. 291 



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 T. A. Crolalarix. 



Flowers yellowish white or greenish; stipules mostly united opposite 



the petiole; raceme often long S. A. Memiesn. 



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



creamish; stipules distinct; raceme short.. . 



9. A. Diniglasii. 

 Pods not inflated. 

 Herbage hoary; raceme dense, 1)4, to 2 in. long; pods crowded, retrorsely 



imbricated, 4 lines long 10. .4. pycnostaehys. 



Herbage nearly glabrous; racemes loose, 3 to 6 in. long; pods deflexed, 

 2}4 lines long 11. vl. Clevelandi. 



1. A. didymocarpus H. & A. Slender, 3 to 10 in. Mgh, pubes- 

 cent; leaflets 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 oblona;, 4 to 6 lines long, on long peduncles; flowers 1 J to 

 2J lines long, dull purplish; calyx rather-densely hirsute with bluck 

 hairs; pods 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 ohcompressed. 



Vaca Mountains; Mt. St. Helena; Mt. Diablo; Berkeley; ilarin 

 Co. and southward to Southern California. Also in the Sierra Foot- 

 hills. Apr. 



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

 leaflets 9 to 15, linear or cuneate, either acute or emarginate at apex; 

 inflorescence 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 obloiig," 8 lines long, somewhat incurved, 2-eelled, 5 to 10- 

 seeded; 'fruiting peduncle 2 in. long, at length spreading, declined or 

 even reflexed. 



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

 May. 



4. A. Brewer! Gray. Much like the preceding but smaller, 

 relatively stouter and the leaflets broader; heads 5 to 7-flo.wered ; pods 

 1-celled or nearlv so, the body short with a long incurved beak. 



First collected in Sonoma Valley by Brewer, California Geological 

 Survey, no. 979, Apr. 18, 1862. 



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

 the growing parts silveiy-canescent, glabrate and greenish in age; 



