PEA FAMILY 313 



B. Stipules reduced to dot-like often reddish glands. 

 1. Pods dehiscent, straight or neably so, 3 14 lines or mostly i/^ to 1% inches long, not 



BEAKED OR ONLY ABRUPTLY AND SHORTLY SO, 2 TO MANY-SEEDED, 



REMAINING ERECT (Subgenus Acmispon). 

 a. Wings conspicuously longer than Iceel; banner attenuate into the claw; stigma subtended by 



a collar of spreading hairs; umbels peduncled. 

 Perennials. 



Leaf-rachis 3 to 12 lines long, the 7 or 8 leaflets scattered along it; leaves 1 to 2% inches 

 long ; umbels commonly 4 to 8-flowered ; bracts of 1 to 3 large leaflets ; stems very 



leafy 8. L. grandiflorus. 



Leaf-rachis % to % line long, the 3 to 5 leaflets palmately or short-prnnately crowded on it ; 

 leaves 3 to 8 (or 11) lines long; umbels 1 or 2 (or 3)-flowered; bracts none or of 

 1 small leaflet; deserts. 

 Stems not prostrate ; leaflets obovate, oblong or oblanceolate. 



Plants erect, rush-like ; herbage canescent or greenish ; flowers 7 to 8 lines long 



9. L. rigidus. 

 Plants with decumbent or ascending stems ; herbage greenish ; flowers 5 lines long.... 



10. L. wrightii. 

 Stems prostrate; herbage silvery-silky; leaflets commonly cuneate-obovate ; San Ber- 

 nardino Mts. to Santa Eosa Mts 11. L. argyracus. 



Annuals; umbels 1 to 3-flo\vered; seeds granulose. 



Leaves not succulent; leaflets linear-oblong; seeds quadrate; mainly cismontane 



12. L. strigosus. 

 Leaves a little succulent; leaflets obovate or roundish-spatulate ; seeds subglobose; deserts.... 



13. L. tomentellus. 



6. Wings about equaling Iceel; banner abruptly clawed; stigma destitute of hairy collar; annuals. 



Umbels 1 to 5-flowered ; leaf-rachis dilated 14. L. salsuginosus. 



Umbels reduced to one flower. 



Flowers peduncled ; leaf-rachis not dilated or scarcely. 



Calyx-teeth shorter than tube; pods constricted between seeds; herbage glabrous 



15. L. micranthus. 

 Calyx-teeth longer than tube; pods slightly or not at all constricted between the seeds; 



herbage villous to subglabrous 16. L. americanus. 



Flowers subsessile in the axils ; leaf-rachis dilated or ribbon-like. 



Stems few, erect, stoutish; corolla cream-color; n. Cal 11. L. denticulatus. 



Stems several to many, slender, prostrate, decumbent or diffuse; corolla yellow; widely 

 distributed. 

 Pubescence densely villous; calyx-teeth usually 2 times as long as tube; pods 3^ to 



5 lines long 18. L. humistratus. 



Pubescence mostly scanty, the hairs ascending or somewhat appressed, or the plants 

 glabrate ; calyx-teeth shorter than or equaling the tube ; pods 5 to 10 lines 

 long 19. L. subpinnatus. 



2. Pods indehiscent, 2 to 7 lines long, mostly attenuate into a long often incurved beak, 



reflexed, 1 to several-seeded; le.wes shortly pinnate, 2^^ to 7 (or 14) 



lines long (Subgenus Syrmatium). 



a. Annuals; pods usually ^-seeded, more or less constricted between the seeds, strongly curved. 



Umbels peduncled; flowers l^/^ to 3 lines long; style glabrous; San Diego coast 



20. L. nuttallianus. 



Umbels subsessile; flowers 1% to 214 lines long; style pubescent; cismontane S. Cal 



21. L. hamatus. 



b. Perennials ; pods 1 to several-seeded, commonly not constricted between the seeds. 



Herbage woolly, silky or spreading-villous; stems several to many from the root-crown, trailing 

 or prostrate. 

 Pubescence appressed ; pods attenuately beaked. 



Leaves all with 3 leaflets ; herbage canescent ; umbels sessile or subsessile, mostly 1 to 

 3-flowered; bracts none; calyx lightly pubescent; mainly in South Coast 



Eanges and S. Cal 22. L. leucophyllus. 



Leaves some with 5 leaflets and some with 4 or 3 ; umbels 3 to 8-flowered ; bracts usually 

 present, sometimes none. 

 Herbage silvery-tomentose ; leaflets 3, 4 or 5; umbels sessUe or subsessile; calyx 

 densely silky ; S. Cal., South Coast Eanges and s. Sierra Nevada foothills 



mainly 23. L. argophyllus. 



Herbage minutely pubescent; leaflets 4 or 5; umbels sessile or peduncled; calyx 



pubescent; Sierra Nevada mainly 24:. L. douglasii. 



Pubescence woolly or villous, the hairs more or less spreading ; pods scarcely beaked or only 

 abruptly and shortly so. 



