218 CRUCIFKKAE (mI'STAUD 1'AMILY) 



pubescence intermingled with the long-rayed stellate canesoence: fruits very 

 large, thin, and papery. — Powder river, Wyoming. 



2. Physaria vitulifera Rydb. Bull. Torr. Bot. Club 28: 278. 1891. Re- 

 sembling the foregoing, but leaves less whitened, fiddle-form in outline: peti- 

 oles somewhat margined and bearing a very few largp teeth; stem lea,ves en- 

 tire, oblanceolate: sihque deeply divided above only,' tlie cells roiind-obovate, 

 divergent; pedicels more or less curved iii fruit. — Dry ravines and cailons; 

 Colorado. i , ■ 



3. Physaria floribunda Rydb. I.e. Densely tufted, the numerous stems 

 and leaves suberect, 15-25 cm. high: radicalleaves oblanceolate or spatulate, 

 sinuately, toothed, usually acute, 5-10 cm. long; c^ulin^ jDbfenceolate, entire: 

 petals bright yellow, oblanceolate, with a broad claw, 8-9 nirt^. Ipng, twice 

 as long as the lanceolate sepals: silique deeply divided above only, the cells 

 globose, 6-8 mm. in diameter. {P. acviifolia Rydb. 1. c.)— Colorado. and 

 Utah. 



,4. Physaria Newberryi Gray, Bot. Iveg Rep. 6. 1860. White, with the 

 densej finp stellate pubescence: leaves and stems rosulatespy^ding: leaves 

 mostly entire, petiwed; radical orbicular to spatulate; cauline spatulate to 

 nearly linear: flowers Jarge; petals 12-15 mm. long: silique deeply nptched 

 above, scarcely notched at all below; the cells laterally flattened and provided 

 with two keels or ridges separating the convex dorsal surface from the nearly 

 flat sides, the walls' folding along the keels in drying. — Colorado and New 

 Mexico, to Utah and Arizona. 



15. LESQUERELLA Wats. Bladdek Pod , 



Low densely stellate-canescent herbaceous armuals, bifennials,' or perennials 

 (sometimes with,frutescent base), with more or less rosulate" radical leaves, 

 and yellow flowers in elongated or corymbose racemes. Se^stls equal at 

 base, oblong. Petals spatulate or oblorig-ovate. Siliques turgid, oblong- 

 ovate, or globose; style slender, rather long, persistent. Seeds flattened. 

 —VesicOfTia. ''''■■. 



Siliquea ^stellate-pubescent. ' -' . , 



Grabose or nearly so, not compressed at apex. ^ 



, All the leaves narrow (linear or oblanceolate) . , . . 1. L. argentea. 

 Some of the radial leaves broad (oval or obovate). 



Silique and pedicel subequal; the style shorter . ., . 2. L, macrocarpa. 



Silique and style subequal; the pedicel longer . , , ,, .. 3.. L. prostrata..i,,. 

 Ovate or oblong, often compressed at apex. 

 All the leaves narrow (linear or oblanceolate). 



Plants lowi caesnitose (less than 1 dm. high). ; t t 



Kaceme and leaves subequal . . ' . . . ' '4. L. condensata. 



I , BAceme surpassing the leaves : 5. L. alpina. ; ,7 



Plants taller,- not caespitose, branched from the base (more 



■ ' than 1 dm. high) . . : . , ' . . . 6. L. curvipes. 



Some of the radical leaves broad (orbicular to obovate). . I ■■ 



Raceme elongated, narrow . . .... 7. L. montana. 



Raceme short, subcorymbose -r,- jiS.- L. valida. 



Siliques' glabrous. 1 ._ . " "' 



All leaves narrow (linear or oblanceolate) 9. L. Fendleri. 



Some leaves broad (orbicular to obovate). 



Stem leaves linear to oblanceolate . . ... . . 10. L. Engehnannii. 



Stem leaves large, ,thin,_elliptic . . , . , ,. , . 11. L. aurea, 



1. Lesquerella argentea (Pursh) MacM. Met. Miim. 263. 1892. Stellate- 

 pubescieht throughout but greenish rather than white: stems several from the 

 crown, decunibent s{>feadihg, simple or branched; leaves all linear or lineaiT- 

 oblanceolate; the basal crowded-rosulate, 3-8 cm. long, entire or remotely 

 toothed; raceme in fruit 10-25 cm. long: silique globose or nearly so, about 

 5 min. I'png, equaling the slender style: pedicel 'spreading or recurved, 1-2 cm. 

 long. Vesicaria ludoviciana. — Colorado to Mbntana and Minnesota.: 

 ' 2. Lesquerella macrocarpa A. Nels. Bot. Gaz. 34: 366. 1902. Light green 

 but stellate-pubescent throughout, freely branched from the crown ; branchfes 

 decumbent-prostrate with assurgent tips, mostly^ simple: radical leaves or- 

 bicular to obovate, short-petioled; cauUne oblong or oblanceolate, short-- 



