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 st3'le. L. Lunellii 

 A. Nels. Hills and plains: Man.^S.D. — -Colo.—AIont. — -Sask. Plain — Sub- 

 mont. Je-JI. 



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 ram. 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 — SubmonL My- 



JL 



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

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

 pale yellow; pods 3^ mm. long, shghtly 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^ cm. long; blades oval or obovate; stem-leaves smaller, oblance- 

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

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

 long, much longer than the pod. Dr^^ 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, recur\'ed; body of pod 5-8 mm. thick; style 2-3 mm. long. 

 Clay flats and ridges : Wyo. Plain, Je. 



18. L. Gordoni (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 recur\'ed; 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 sess,ile, Unear-oblanceolate; inflorescence corj-mbi- 

 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, spreadmg. Petals oblong or spatulate, 

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

 subglobose or pear-shaped, turgid. Seeds few. Embrj^o folded above the 

 radicle. 



