MUSTARD FAMILY 331 



5. P. acutifolia Rydb. Stems 4-6 cm. long, ascending or dejiressed; basal 

 leaves numerous, oblanceolate or obovate, acute, entire or slightly wavy, very 

 finely stellate; fruit small, obtuse or slightly cordate at the base, deeply divided 

 above, 4-6 mm. in diameter. (?) LesquereUa pruinosa Greene. Mountains: 

 Colo. — Wyo. Suhniont. — Mont. 



6. P. brassicoides Rydb. Stems about 1 dm. high, ascending; basal leaves 

 large, with winged jictioles almosf orbicular in outline, sinuate-dentate, 2.5-5 

 cm. in diameter; fruit almost obcordate, acute at the base, deeply divided above, 

 8-10 mm. long and 5-8 mm. in diameter. Canons and bad lands: Neb. — N.D. 

 Plain. Je. 



7. P. Newberryi A. Gray. Stems 8-20 cm. high, decumbent at the base; 

 basal leaves 3-10 cm. long, with margined petioles, finely stellate-canescent, 

 obovate or spatulate, entire or sinuate-dentate; petals oblanceolate, about 1 cm. 

 long; pod deeply cleft above, slightly so below. Dry mountains and hills: N.M. 

 — Ariz. — -Nev. — Utah. Submont. — Mont. My-Je. 



8. P. Geyeri (Hook.) A. Gray. Stems ascending or decumbent, 5-15 cm. 

 long; ba.sal leaves 2-5 cm. long, with margined petioles, obovate to nearly orbicu- 

 lar, finely stellate, sinuately-toothed or entire; petals 8-12 mm. long, spatulate; 

 pods obcordate, about 6 mm. wide and 3 mm. thick. Dry hillsides: Wash. — 

 Mont. — Wyo. Submont. My-JI. 



10. LESQUERELLA S. Wats. Bladder-pod. 



Annual or tufted perennial, stellate herbs. Leaves entire or lobed, the 

 blades linear to broadty spatulate or orbicular, the basal ones clustered. Flow- 

 ers perfect, racemose. Sepals oblong, equal at the base; petals spatulate, yellow. 

 Stamens 6; anthers linear, sagittate. Pods inflated, subglobose, ellipsoid, or 

 ovoid; style slender; stigma entire; cells 2-16-seeded. Seeds rarely margined. 

 Cotyledons accumbent. 



Ovary and pod stellate-pubescent. 

 Pod ovoid or ellijisoid. 



Pod distinctly compressed and acute at the apex. 



Pod 6-8 mm. long; plant usually more than 1 dm. high. 



Basal leaves broadly oval: septum of the pod elliptic in outline; style 



equalling the pod. 1. /-. Shearis. 



Basal leaves oblanceolate to obovate; septum of the pod ovate in outline; 

 style much shorter than the pod. 2. L. curvipes. 



Pod 3-5 mm. long; plant usually 1 dm. or less high. 

 Basal leaves linear-oblanceolate or linear. 

 Pod strongly compressed above. 



Leaves narrowly Unear-oblanceolate; plant puhinate. 



3. L. alpina. 

 Leaves narrowly linear; plant multicipitous, with a subterranean 

 woody caudex. 4. /_,. parvula. 



Pods slightly compressed. 5. L. intermedia. 



Basal leaves spatulate; pod not strongly compressed above. 



Plant densely i)ulvinate, 2-5 cm. high; leaves 2 cm. long or less; pedicels 

 erect or nearly so. 6. L. condensala. 



Plant cespitose, 5-10 cm. high; leaves about 2 cm. long or more; basal 

 leaves oblanceolate-spatulate; pedicels spreading, S-curved. 



7. L. spatulata. 

 Pod not compressed above. 



Basal leaf-blades rounded or broadly spatulate. 



Stem-leaves small, generally less than 1 cm. long, linear-oblanceolate. 

 Basal leaf-blades obovate-spatulate ; style shorter than the pod. 



8. L. prostrala. 

 Basal leaf-blades rhombic-ovate; style longer than the very acute pod. 



9. L. Wardii. 

 Stem-leaves oblanceolate or obovate, 1-2 cm. long. 10. L. montana. 



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



11. L. arenosa. 

 Pod globose. 



Plant perennial. 



Pod 2-3 mm. in diameter. 



Basal leaf-blades spatulate or oblanceolate. 



Stem very slender; stem-leaves oblanceolate, 1-3 cm. long. 



Plant 5 cm. or less high; pod less than 2 mm. broad; petals purple. 



12. L. rosea. 

 Plant usually more than 5 cm. liigh; pod 2-3 mm. broad; petals 



yellow . 



