370 BRASSICACEAE 



8. S. integrifolia James. Stem glabrous, 3-6 dm. high; leaves 5-10 cm. 

 long, thick, glabrous, the upper entire, the lower with triangular to oblong lobes; 

 petals sulphur yellow, about 12 mm. long; pod 5-6 cm. long; stipe 12-15 mm. 

 long, about equalling the pedicels. Dry plains and hills: S.D. Kans. Colo. 

 Wyo. Plain Submont. Je-Jl. 



9. S. arcuata Rydb. Stem 4-10 dm. high, perfectly glabrous, light green 

 and shining, in age straw-colored; leaves thick, 5-12 cm. long; pedicels rather 

 short, in fruit about 1 cm. long; petals yellow, 7-8 mm. long, broadly elliptic; 

 pods 7-10 cm. long, strongly arcuate, and spreading. Dry plains and valleys: 

 Wyo. N.M. Calif. Nev. Son. Je-Jl. 



10. S. canescens Rydb. Stem 0.5-1 m. high, light green, finely puberu- 

 lent or glabrate, terete; leaves grayish puberulent, the upper entire and oblance- 

 olate, 5-7 cm. long, the lower pinnatifid, with oblong lateral lobes and a large 

 oval or elliptic end-lobe; pedicels short, in fruit divergent; blades of the yellow 

 petals linear-oblong, about as long as the claw; pods arcuate, spreading, 5-7 

 cm. long. Dry ground: Utah Ariz. Son. Submont. Je. 



11. S. albescens M. E. Jones. Stem 3-10 dm. high; lower leaves 10-15 cm. 

 long, lyrate-pinnatifid, with oblong or elliptic lobes, the upper hastate at the base; 

 petals fully 1 cm. long; blades broadly oval, about equalling the pubescent 

 claws; pod about 5 cm. long; stipe somewhat longer than the pedicels. Draws 

 and river banks: Colo. Utah Ariz. N.M. Son. Ap-Je. 



FAMILY 53. CAPP ARID ACE AE. CAPER FAMILY. 



Herbs with alternate, digitately compound or rarely simple leaves. Flow- 

 ers perfect, regular or irregular, usually in racemes. Sepals 4, distinct or 

 united at the base. Petals 4, rarely more, clawed. Receptacle often 

 thickened or produced between the stamens and the petals. Stamens 6 or 

 more. Gynoecium of 2 united carpels, 1 -celled, with 2 parietal placentae, 

 sessile or stalked. Fruit in ours dehiscent, the valves separating from the 

 frame-like placentae (replum). 



Pods elongate, linear; receptacle with an appendage or gland. 



Appendages tubular; petals cuneate-flabelliform, laciniate, very unequal. 



l. CRISTATELLA. 

 Appendages solid; petals entire, emarginate or 3 toothed, but not laciniate. 



Stamens 12-32; capsule sessile or short-stipitate. 2. JACKSONIA. 



Stamens 6; capsule long-stipitate. 3. PERITOMA. 



Pods short; receptacle without appendages. 



Pod oblong, flattened parallelly to the replum. 4. CELOME. 



Pod broader than long, more or less flattened contrary to the replum. 



5. CLEOMELLA. 

 1. CRISTATELLA Nutt. 



Slender glandular annuals. Leaves alternate, without stipules, palmately 

 trifoliolate, with narrow entire leaflets. Flowers perfect, small, white or yellow- 

 ish, in terminal racemes. Sepals 4, united at the base, deciduous. Receptacle 

 produced between the posterior petals and the ovary into a tubular appendage, 

 as long as the smaller petals. Petals 4, more or less fan-shaped, clawed, lacin- 

 iate at the apex, the posterior larger. Stamens 6-14, declined; filaments fili- 

 form, distinct; anthers sagittate. Capsule elongate, flattened. Seeds numer- 

 ous. 



1. C. Jamesii T. & G. Erect annual; stem 1-4 dm. high, glandular-puberu- 

 lent, branched above; leaflets 3, linear or linear-oblong, 8-25 mm. long; petals 

 cream-colored, 3-4 mm. long; stipe about 4 mm. long; body of the capsule about 

 2 cm. long and 4 mm. wide, glandular, oblanceolate or oblong. Sandy soil: la. 

 Ark. Colo. Plain. Je-Au. 



2. JACKSONIA Raf. CLAMMY-WEED. 



Glandular, clammy annuals. Leaves alternate, without stipules, palmately 

 trifoliolate or sometimes simple. Flowers perfect, somewhat irregular, in ter- 



