MUSTARD FAMILY 333 



11. L. arenosa (Richards.) Rydb. Stems slender, decumbent or ascending, 

 1-3 dm. high; petals 6-8 mm. long; fruiting pedicels spreading, recurved; pod 

 globose or slightly ellipsoid, 4-5 mm. long, shorter than the style. L. Lunellii 

 A. Nels. Hills and plains: Man. S.D. Colo. Mont. Sask. Plain Sub- 

 mont. Je Jl. 



12. L. rosea Greene. Stems slender, 5 cm. or less high; basal leaves about 

 1 cm. long; blades ovate or ovate-lanceolate; stem-leaves few, oblanceolate, 

 sessile; petals rose-purple; pod 2 mm. thick, shorter than the style. Plains: 

 Sask. Alta. Plain. Je. 



13. L. versicolor Greene. Stems decumbent, 2-3 dm. high; basal leaves 

 few and small; blades oval or oblanceolate, entire or toothed; stem-leaves ob- 

 lanceolate; petals sulphur-yellow, changing into pink; pod 3 mm. thick; style 

 4 mm. long. Stony mountains: Man. Sask. Plain. Je. 



14. L. ludoviciana (Nutt.) S. Wats. Stems erect or decumbent at the 

 base, 1-4 dm. high; basal leaves linear-oblanceolate, 3-10 cm. long, entire or 

 repand; petals 7-8 mm. long; pedicels in fruit spreading and recurved; pods 

 4-5 mm. long; style about the same length. L. argentea (Pursh) MacMill., not 

 S.Wats. Plains and hills: Man. Kans. 'Colo. 'Mont. Plain -Submont. My- 

 Jl. 



15. L. Macounii Greene. Stems several, decumbent, 1-1.5 dm. high; basal 

 leaf-blades oval or elliptic, repand-dentate; pedicels spreading, recurved; petals 

 pale yellow; pods 3-4 mm. long, slightly shorter than the styles. Dry plains: 

 Alta. Plain. Au. 



16. L. utahensis Rydb. Stems ascending, 5-10 cm. (seldom 15 cm.) high; 

 basal leaves 3-4 cm. long; blades oval or obovate; stem-leaves smaller, oblance- 

 olate or spatulate; petals yellow, about 8 mm. long; pedicels in fruit ascending; 

 pod a most spherical or slightly obcompressed, 3-4 mm. wide; style 4-5 mm. 

 long, much longer than the pod. Dry hills: Utah. Submont. -Mont. Je-Jl. 



17. L. macrocarpa A. Nels. Stems decumbent, 7-15 cm. high; basal 

 leaf-blades orbicular or obovate; petals 5-7 mm. long, spatulate; pedicels in 

 fruit spreading, recurved; body of pod 5-8 mm. thick; style 2-3 mm. long. 

 Clay flats and ridges: Wyo. Plain. Je. 



18. L. Gordon! (A. Gray) S. Wats. Annual or perhaps biennial; stems 1-3 

 dm. high, erect, slender; leaves narrowly oblanceolate, entire or repand; petals 

 6-7 mm. long; fruiting pedicels somewhat recurved; pod slightly stipitate, globose, 

 4 mm. thick, sparingly stellate; style slightly shorter. Sandy soil: Tex. Calif. 

 Utah. Son. Mr-My. 



19. L. Engelmanni (A. Gray) S. Wats. Cespitose perennial; stems erect, 

 3-5 dm. high; petals often 1 cm. long; fruiting pedicels ascending or the lower 

 spreading; pod 6-8 mm. thick; style about 8 mm. long. Rocky hills and plains: 

 Tex. N.M. Colo. Son. Ap-My. 



20. L. stenophylla (A. Gray) S. Wats. Stems many, very leafy; petals 

 about 8 mm. long; fruiting pedicels ascending, 1-1.5 cm. long; pod 4-5 mm. 

 thick; style of about the same length. L. Fendleri Coulter & Nels., not S. Wats. 

 Dry plains and hills: Tex. Ariz. Colo.; n Mex. Son. My-Je. 



21. L. ovalifolia Rydb. Stems erect, 1-2 dm. high; basal leaves petioled, 

 1-2 cm. long; stem-leaves sessile, linear-oblanceolate; inflorescence corymbi- 

 form; petals 8-10 mm. long, obovate; fruiting pedicels ascending; pods 5-6 mm. 

 thick; style of about the same length. L. ovata Greene. L. Engelmanii Coult. & 

 Nels., not S. Wats. Dry plains and hills: Neb. Kans. N.M. Colo. Plain 

 Son. My-Je. 



11. SUBULARIA L. 



Small aquatic perennials, scapose and with subulate basal leaves. Flowers 

 perfect, racemose. Sepals ovate, equal, spreading. Petals oblong or spatulate, 

 without claws, white. Stamens 6, scarcely unequal; anthers oval. Pod short, 

 subglobose or pear-shaped, turgid. Seeds few. Embryo folded above the 

 radicle. 



