CRUCIFERAE (MUSTARD FAMILY) 219 



petioled, 15-30 mm. long: raceme crowded even in fruit: petals obovate, 

 emarginate, 5-7 mm. long: silique subglobose, 6-8 mm. in diameter, twice 

 as long as the style; pedicels stout, recurved, 5-10 mm. long. Naked clay 

 ridges and flats ; Red Desert, Wyoming. 



3. Lesquerella prostrata A. Nels. Bull. Torr. Bot. Club 26: 124. 1899. 

 The stellate-pubescence dense and silvery: stems several to many, rosulately 

 spreading, sometimes branched: crown-leaves densely rosulate, rhomboidal, 

 orbicular, oval or oblong, 5-15 mm. long, the petioles often longer; cauline 

 few, oblanceolate to linear: raceme in fruit 6-12 cm. long: silique subglobose 

 or broadly ovate, as long as the style but somewhat surpassed by the curved, 

 spreading or recurved pedicel. [L. utahensis Rydb. Bull. Torr. Bot. Club 

 30: 252. 1903; L. Macounii Greene, Pitt. 4: 310. 1901 (?).] Wyoming, Utah, 

 and probably Colorado. 



4. Lesquerella condensata A. Nels. Bull. Torr. Bot. Club 26: 228. 1899. 

 Depressed-caespitose, the caudex multicipital, not rising above the ground, 

 acaulescent, the linear leaves and small crowded racemes on the crowns and 

 subequal: petals spatulate, about 6 mm. long: silique ovate, compressed at 

 summit, 5 mm. long, two-ovuled in each cell (usually only one maturing). 

 (L. parvula Greene, Pitt. 4: 308. 1901.) Barren and rocky slopes; one of the 

 earliest plants to bloom; southern Wyoming and in Colorado. 



5. Lesquerella alpina (Nutt.) Wats. Proc. Am. Acad. 23: 251. 1888. Cau- 

 dex few-branched; the branches usually rising a few cm. above the ground, 

 thickly covered with the persistent leaf-bases : leaves all linear, tufted on the 

 several crowns and on the base of the very short stems: raceme slender- 

 pedunculate, often few-flowered ; the pedicels slender, erect or recurved, much 

 longer than the silique: silique ovate, somewhat angled but scarcely com- 

 pressed, 3-4 mm. long, nearly equaled by the slender style. (L. spathulata 

 Rydb. Cont. U. S. Nat. Herb. 3: 486. 1896.) The upper Missouri region. 



6. Lesquerella curvipes A. Nels. Bull. Torr. Bot. Club 25: 205. 1898. 

 Stems numerous on the expandqd crown of the woody root, in fruit 1.5-3 dm. 

 long: radical leaves oblanceolate, on margined petioles; cauline oblanceolate 

 to linear, with a narrowed petiole-like base, 3-6 cm. long: siliques ovate, com- 

 pressed at summit, gibbously convex toward the base, about 8 mm. long; 

 the slender style somewhat shorter; pedicels 1-2 cm. long, "s "-shaped (the 

 proximal part curved upward, the distal downward, with ascending tip): 

 seeds 2 in each cell, rarely 1 or 3. Wyoming. 



7. Lesquerella montana (Gray) Wats. Proc. Am. Acad. 23: 251. 1888. 

 Caudex usually simple, the leaves and stems rosulate-spreading: stems mostly 

 simple, short : crown-leaves crowded, some of them broad (orbicular, obovate, 

 or rhomboid), passing into the oblanceolate ones of the stems, 1-2 cm. long: 

 siliques oblong, not compressed at summit but sometimes slightly quad- 

 rangular, about 6 mm. long, somewhat exceeding the style, usually erect on 

 the upwardly turned tip of the widely divaricate subequal pedicel. (L. 

 Shearis Rydb. Bull. Torr. Bot. Club 29: 237. 1902; L. rosulata A. Nels. Bull. 

 Torr. Bot. Club 25: 205. 1898.) Colorado and southern Wyoming. 



8. Lesquerella valida Greene, Pitt. 4- 68. 1899. Silvery lepidote-stellate, 

 the leaves and stems crowning a taproot: stems decumbent, 1-2 dm. high: 

 basal leaves entire or toothed, obovate or spatulate, petioled; cauline ob- 

 lanceolate: raceme short and dense, hardly more than corymbose even in 

 fruit: siliques ovate, somewhat compressed, tipped with a style of half their 

 own length; the cells about 6-ovuled. Southern Colorado and New Mexico. 



9. Lesquerella Fendleri (Gray) Wats. Proc. Am. Acad. 23: 251. 1888. White- 

 canescent: caudex multicipital; stems several, slender, erect, 1-2 dm. high: 

 leaves all linear or narrowly oblanceolate: raceme short, dense: siliques 

 glabrous, subglobose, 4-6 mm. in diameter, on slender much longer erect 

 pedicels; the style about equal in length; the cells 10-16-ovuled. Southern 

 Colorado to Texas. 



10. Lesquerella Engelmannii Wats. 1. c. 254. Silvery canescent: stems 

 low and simple or taller and branched, 1-3 dm. long: some of the radical 

 leaves broad (orbicular to oblanceolate), petioled; cauline oblong or oblanceo- 



