1923] Ottleij: A Revision of the Calif oniian Species of Lotus 199 



Legumes 1 or 2-seeded, arcuate, often short and fat. 



Calyx teeth short-triangular; keel equal in length to the wings or longer; 

 herbage glabrous or with appressed pubescence 25. L. junceus. 



Calyx teeth linear or subulate; keel equal in length to the wings or 

 shorter; herbage pubescent. 



Pubescence somewhat woolly, hairs of young stems loose and spread- 

 ing making with the stem, at point of insertion, a right or 

 an obtuse angle; legume abruptly beaked, not keeled or only 

 slightly so 26. L. eriophorus. 



Pubescence mostly appressed, hairs of young stems always joining 

 the stem at less than a right angle; legume attenuately beaked, 

 mostly clearly keeled. 



Banner blade oblong to short-oblong, making an acute angle with 

 the wings. 



Pubescence not silky, hairs on leaves and calyces somewhat 

 arched .". 27. L. douglasii. 



Pubescence usually silky, hairs on leaves and calyces soft, 

 straight, mostly long 28. L. argophyllus. 



Banner blade short-obovate, either reflexed, or erect and making a 

 right angle with the wings 29. L. davidsonii. 



1. L. incanus Greene (pi. 61). Densely gray -woolly somewhat 

 silky perennials, erect, 1.5 to 3 dm. tall ; leaves 2 to 8 em. long ; leaflets 

 5 to 15, commonly 7 or 9 ; stipules ovate, scarioiis or membranous ; 

 umbels few to many-flowered, on peduncles slightly shorter than the 

 leaves; bract typically stipulate, pinnately compound, closely asso- 

 ciated with the umbel or removed from it; pedicels more than 1 mm. 

 long; flowers 1.2 to 1.5 cm. long; calyx teeth linear-subulate, hairy, 

 less than one-half the length of the oblong-campanulate tube ; claws 

 of the petals long and exserted beyond the calyx tube; banner claw 

 removed from the other claws; wings longer than the short obtuse 

 keel ; legumes reddish or dark j-ellowish brown, with glabrous surface 

 finely reticulated, 1.5 to 4 cm. long by 3 to 7 mm. wide ; seeds several, 

 suboval, smooth, mottled with olive and black, 3 mm. or less long. 



Open places in pine woods of Butte, Placer, and Nevada counties. 

 Of limited occurrence in Upper Sonoran and Transition. Distribu- 

 tion Map 1. May- July. 



Localities. — Near Stirling, Butte County, Heller 10797 ; Stirling 

 City ; HaU, May 27, 1913 ; Alta, Placer County, K. Brandegee, July 6, 

 1889; Alta, Kellogg 37; Cape Horn, Placer County, K. Brandegee; 

 Blue Caiion, Placer County, Walker 1278 ; near Gold Run, Placer 

 County, Sonne, June 5, 1891. 



References.— LoTVS incanus Greene, Pitt., vol. 2, 1890, p. 147. 

 Hosackia incana Torr., Pac. R.R. Rep., a'oI. 4, part 5, 1857, p. 79, pi. 4; 

 tj'pe loc, dry hillsides near South Yuba, Bigelow. 



2. L. stipularis Greene (pi. 62 and pi. 63, fig. 1). Taller than L. 

 incanus Greene, its villous pubescence less dense and not at all silky, 

 the hairs long and somewhat wavy ; largest leaves 10 to 13 cm. long ; 

 leaflets 11 to 15 (19) in number, oval or almost oblong, often with 

 first pair at the base of the leaf and more or less covering the stipules ; 



