332 BRASSICACEAE 



Pedicels ascending. 13. L. versicolor. 



Pedicels in fruit recurved. 11. L. arenosq. 



Stem stcmter, strict; stem-leaves linear, 2-6 cm. long. 14. L. ludoviciana. 

 Basal leaf-blades broadly oval, ovate, or elliptic. 



Basal leaves repand-dentate ; stems stout; raceme loose; pedicels re- 

 curved. 15. L. Macounii. 

 Basal leaves entire; stem slender; racemes congested; pedicels upcuryed. 



16. L. utahensis. 



Pod 5-6 mm. in diameter; stem-leaves broadly spatulate. 17. L. macrocarpa. 

 Plant annual. 18. L. Gordoni. 



Ovary and pod glabrous, globose. 



Plant annual. 18. L. Gordoni. 



Plant perennial. 



Basal leaf-blades oblanceolate ; stem-leaves narrowly so. 



Plants usually more than 3 dm. high; flowers and fruit corymbose. 



19. L. Engelmanni. 



Plant usually less than 3 dm. high; inflorescence at least in fruit elongate, 

 racemose. 20. L. stenophylla. 



Basal leaf-blades broadly oval. 21. L. ovalifolia. 



1. L. Shearis Rydb. Stems several, ascending, 1-2 dm. high; basal leaves 

 3-4 cm. long; blades broadly oval or ovate; stem-leaves oblanceolate, about 2 

 cm. long, subsessile; pedicels in fruit bent S-shaped; pods erect, 7-8 mm. long, 

 acute, compressed above. Creek banks and foot-hills: Colo. Submont. Je-Jl. 



2. L. curvipes A. Nels. Stems tufted, numerous, adsurgent, 1.5-3 dm. 

 high; basal leaves with oblanceolate to obovate blades; stem-leaves linear or 

 oblanceolate; pedicels S-curved, about 1 cm. long; pod ovate in outline, gibbous 

 at the base, flattened at the apex, about 8 mm. long. Dry mountains: Colo. 

 Mont. Submont. Mont. My-Je. 



3. L. alpina (Nutt.) S. Wats. Stem 2-10 cm. long, erector adsurgent; basal 

 leaves 2-5 cm. long; stem-leaves narrowly linear; petals about 6 mm. long; pods 

 usually erect, ovoid; body about 4 mm. long; style slightly longer; septum usually 

 perforated. Dry hills and plains: Mont. Utah Colo. N.D. Submont. 

 Subalp. Je-Jl. 



4. L. parvula Greene. Stems 1-4 cm. high; leaves all narrowly linear, 

 silvery stellate; pods ovate, 4-5 mm. long, erect; style slightly longer; septum 

 usually perforated. High mountains: Colo. Subalp. -Alp. Je-Jl. 



6. L. intermedia (S. Wats.) Heller. Pulyinate-cespitose; stems numerous, 

 5-10 cm. high, leafy; leaves oblanceolate or linear-oblanceolate; petals fully 1 

 cm. long; pedicels in fruit erect; pod 4-5 mm. long, ovoid; style of about the 

 same length; septum usually entire. Arid regions: N.M. Ariz. Utah. Son. 

 My-Je. 



6. L. condensata A. Nels. Stems numerous, 3-5 cm. (rarely 7 cm.) high; 

 leaves spatulate, 8-20 mm. long; inflorescence short and corymbiform; petals 

 6-7 mm. long; pod ovoid, slightly compressed, 5 mm. long and about equalling 

 the style; septum usually with a narrow perforation. Rocky slopes of the foot- 

 hills: Mont. Wyo. Submont. My-Je. 



7. L. spatulata Rydb. Stems 3-10 cm. high; stem-leaves few, linear; petals 

 spatulate, 7-8 mm. long; pod ovoid, about 5 mm. long; style slightly shorter; 

 septum not perforated. (?) L. nodosa Greene. Dry hills: Man. Neb. Utah 

 Mont. Plain Submont. Je-Jl. 



8. L. prostrata A. Nels. Stems many, spreading; petals about 7-8 mm. 

 long; pedicels in fruit ascending, recurved; pod 5-6 mm. long, ovoid; septum 

 mostly perforated. Gravelly slopes: Sask. Colo. Plain Submont. Je. 



9. L. Wardii S. Wats. Stems decumbent; basal leaves long-petioled ; blades 

 1-3 cm. long, 1-2 cm. wide; petals 7-9 mm. long; fruiting pedicels ascending; 

 pod ellipsoid, terete or obcompressed; body 6 mm. long. Mountains: Utah. 

 Mont. Subalp. Je-Jl. 



10. L. montana (A. Gray) S. Wats. Stems decumbent, 1-2 dm. high; blades 

 ovate or broadly spatulate, often sinuate; petals spatulate, about 1 cm. long; 

 fruiting pedicels more or less S-curved; pod ellipsoid, 7-10 mm. long, not com- 

 pressed; style slightly shorter. L. rosulata A. Nels., a depauperate form. Moun- 

 tains: Wyo. N.M. Utah. Submont. Subalp. My-Je. 



