206 Leguminosae 



2.5-4.5 mm. wide, sparsely puberulent at least on the margins r f 

 spikes nearly sessile, 5-8 cm. long, usually dense; flowers very 

 short-pedicelled, 2 mm. long; pods straight or slightly falcate, 

 only 1-3 developing, 10-15 cm. long, 10-12 mm. wide, longitudi- 

 nally veiny, on stipes about 5 mm. long, straw-colored and sweet- 

 ish when mature. 



River bottoms about San Bernardino. Common on the Colorado Desert. 



2. P. pubescens Benth. (TORNILLA or SCREW-BEAN.) A shrub 

 or small tree resembling the last in habit, more or less puberulent ; 

 stipules spinescent; leaflets 5-8 pairs, the pairs 3-5 mm. distant,, 

 oblong, 5-8 mm. long, obtuse at apex; spikes on peduncles about 



1 cm. long, 4-6 cm. long, often lax; flowers sessile, 3 mm. long y 

 pods usually several-many developing, twisted into a straight 

 cylinder, 25-35 mm. long, about 5 mm. broad, on stipes less than 



2 mm. long. 



River bottoms about San Bernardino, with the last. 



2. XYL.OTHERMIA Greene. 



A rigid much branched spinescent shrub with small 

 nearly sessile 1-3-foliate exstipulate leaves and large 

 solitary subsessile purple flowers. Calyx campanulate, 

 repandly 4-toothed. Petals equal ; standard orbicular, 

 the sides reflexed ; keel petals distinct, oblong, obtuse. 

 Stamens distinct. Pod linear, compressed, straight, sev- 

 eral-seeded. 



1. X. montana (Nutt.) Greene. Shrub 1-2 m. high, the 

 branches widely spreading; leaves crowded; leaflets 6-18 mm. 

 long, oblanceolate, acute, entire, somewhat silky-pubescent when 

 young; flowers near the ends of the stiff spinescent branchlets, 

 on short 2-bracteolate peduncles, rose-colored or purple, 15-20 

 mm. long. (Pickeringia montana Nutt.) 



Occasional in the chaparral belt throughout our range. 



3. LUPINUS L. LUPINE. 



Annual or perennial herbs or woody plants, with pal- 

 mately 5-15-foliate leaves and adnate mostly inconspicu- 

 ous stipules. Leaflets entire. Flowers in terminal 



