116 



LEGUMINOSJS. 



Lupinus. 



* * Perennials, dwarf and cespitose. In the Sierra Nevada. 



Stems completely herbaceous, with rather long internodes. 



Loosely villous with long hairs. 25. L. ARIDUK. 



Appressed-silky, the hairs shorter. 26. L. MINIMUS. 

 Stems leafy, from a spreading woody caudex : appressed-silky. 



Leaflets 7 to 10, obtuse : peduncles short : standard orbicular. 27. L. BIIEWERI. 



Leaflets 5 to 6, acutish : peduncles elongated : standard elliptical. 28. L. LYALLII. 



* * * Perennials, more or less shrubby at base, tall and leafy, silky-pubescent : petioles mostly 

 short : flowers large : ovules 6 to.12. 



Pubescence not dense : leaflets narrowly lanceolate : flowers yellow : 



ovules 10 to 12. 

 Pubescence dense : leaflets broader, obtuse : flowers blue to white : 



ovules 6 to 8. 

 Pubescence short, mostly tomentose : leaflets oblanceolate : bracts long : 



flowers blue : ovules 8 or 9. 



1. L. AKBOREUS. 



2. L. CHAMISSOXIS. 



3. L. DOUGLASII. 



* * * * Perennials, herbaceous, mostly tall : flowers large : ovules 6 or more, excepting L. Sit- 



greami and L. Grayi. 



Leaflets smooth above, oblanceolate : flowers not yellow. 



Petioles elongated : stem somewhat succulent : bracts short and decid- 

 uous. Sparingly villous : leaflets 10 to 16, large : stipules 

 broad : ovules 9. 4. L. POLYPHYLUJS. 



Petioles scarcely exceeding the (5 to 10) leaflets : bracts mostly long. 



Nearly glabrous, erect : stipules narrow : ovules 8 to 10. 5. L. RIVULAHIS. 



Calyx sub villous : stipules broader : bracts more hairy, subpersist- 



ent : lower petioles elongated : pedicels short. 6. L. BUKKEI. 



More pubescent or villous, subdecumbent, leafy : leaflets 5 to 8, 



smaller : keel ciliate : ovules 10 to 12. 7. L. LITTORAUS. 



Puberulent and subvillous : bracts short : ovules 5. 10. L. SITGREAVESII. 



Leaflets pubescent both sides, as long as the petioles : ovules 6 to 8. 



Flowers yellow : keel ciliate : bracts long. 8. L. SABINII. 



Flowers not yellow : bracts short : leaflets 5 to 9. 



Erect, tall : pubescence often scanty : keel narrow, strongly falcate, 



naked ; standard naked. 9. L. ALBICAULIS. 



Subdecumbent, appressed-silky : standard silky ; keel ciliate. 11. L. ORNATUS. 



Hoary- tomentose, a span high : standard naked ; keel ciliate. 14. L. GRAYI. 



Perennials, herbaceous, mostly rather low : flowers smaller : ovules 6 or less. 



Leaflets glabrous above, 



Mostly shorter than the petioles : standard naked. 



Tall, scantily puberulent : keel usually naked : pod small, 2 - 



4-seeded. 19. L. PARVIFLORUS. 



A span high or less, sparingly villous : keel strongly ciliate : pod 



broad, 6-ovuled. 17. L. ONUSTUS. 



Equalling the petioles : appressed-silky : petals naked or nearly so : 



pod short, 3-5-ovuled. 22. L. ARGENTEUS. 



Leaflets pubescent on both sides. 



Leaves distant ; lower petioles elongated. 



Pubescence villous, spreading : bracts deciduous, often long : stand- 

 ard hairy : keel ciliate. 12. L. SERICEUS. 

 Densely silky-tomentose, stout : pedicels very short : bracts subper- 



sistent : standard very hairy : keel subciliate. 13. L. LEUCOPHYLLUS. 



Densely appressed silky-villous, often low : bracts deciduous : stand- 

 ard naked. 15. L. LEPIDUS. 

 Silky-villous : raceme dense : bracts persistent : standard oblong, 



naked. 16. L. CONFERTUS. 



Stems leafy : petioles short. 



Standard and keel naked : calyx not spurred. 



Puberulent, much branched, slender. 18. L. ANDERSONII. 



Densely silky-tomentose : flowers very small. 24. L. MEIONANTHUS. 



Standard and keel more or less hairy : calyx spurred. 



Finely appressed-silky : calyx strongly spurred : standard longest. 20. L. CALCARATUS. 

 Appressed-puberulent : leaflets narrower : petals equal. 21. L. LAXIFLORUS. 



Close silvery-silky : calyx slightly spurred. 23. L. HOLOSERICEUS. 



