PEA FAMILY 183 



2. Flowers white, or yellowish, 12-20 mm. long 



a. Leaflets linear to oblong, 3-20 times longer 



than wide ; stems erect, 4-12 in. high L. arizonicus 



b. Leaflets ovate, mostly less than twice as long 



as wide, or rounded ; stems climbing or trail- 

 ing, 1-3 ft. high L. ochroleucus 



LOTUS Linne 1753 TREFOIL 

 (The Greek for various plants) 



PL 29, fig. 10. 



Sepals 5, united into a tube, petals 5, reddish to yellow or white, 

 stamens 10, 9 united, pod linear to oblong, somewhat flattened, splitting 

 when mature; flowers solitary or clustered; leaves of 3 leaflets, rarely of 

 a single leaflet; annual or perennial. 



1. Leaflets 3-5, oblong to linear; calyx teeth and 



tube about equal; keel not attenuate-curved; 



perennial L. Wrightii 



2. Leaflets 3, rarely 1 or 4, lance-ovate ; calyx teeth 



much longer than the tube; keel attenuate- 

 curved ; annual L. purshidnus 



LUPINUS Linne 1753 LUPINE 

 (The Latin name) 



PL 27, fig. 2. 



Sepals 5, united into a 2-lipped calyx, petals 5, purple, blue, pink, white 

 or yellow, standard with reflexed margins, wings oblong to obovate, keel 

 incurved, stamens 10, united, ovary 1-celled, pod flattened, leathery ; flowers 

 in terminal spikes or racemes; leaves alternate, digitate, of 3-15 leaflets; 

 perennial or annual. 



1. Low annuals, 2-8 in. high, with long hairs; pods 



mostly 1-2-seeded 



a. Racemes oblong to elongate; lower calyx lip 



entire or nearly so L. pusillus 



b. Racemes head-like ; lower calyx lip 2-3-toothed L. Kingii 



2. Perennials, usually 1-4 ft. high ; pods mostly 3-8- 



seeded 



a. Plants low, tufted, often nearly stemless, 1-6 



in. high ; flowers 5-7 mm. long L. caespitosus 



b. Plants not tufted, 1-3 ft. high; flowers 6-18 



mm. long 

 (1) Flowers 6-12 mm. long; calyx rounded to 



spurred ; leaves smooth to hairy or silky L. argenteus 



