1921] 
PAYSON—MONOGRAPH OF THE GENUS LESQUERELLA 181 
seem no more than the variations between individuals.  L. versi- 
color is a form in which the pedicels are not recurved and the 
flowers are tinged with red. L. rosea has recurved pedicels and 
red flowers. Bergman, from field observation, has noticed the 
color of the flowers in this species to be exceedingly variable. 
23. L. macrocarpa A. Nelson, Bot. Gaz. 34: 366. 1902; 
Nelson in Coulter & Nelson, Manual Cent. Rocky Mountains, 
218. 1909; Rydb. Fl. Rocky Mountains, 333. 1917. 
Perennial, finely stellate-pubescent throughout, rays distinct, 
branched; stems deeumbent or procumbent, .5-2 dm. long, 
simple or branched, rather stout; terminal bud remaining unde- 
veloped or producing a short, sterile shoot; radical leaves 14 
em. long, blade ovate or orbicular, entire or sparingly toothed, 
abruptly narrowed to a petiole; cauline leaves numerous, ovate 
to oblanceolate, obtuse, entire, 1-3 cm. long; petals yellow, 
broadly spatulate, about 7 mm. long; filaments linear; fruiting 
inflorescence elongated; pedicels stout, recurved, usually less 
than 1 cm. long; pods pendent, sessile, stellate-pubescent, 
when fully developed often 6-7 mm. in diameter, valves rather 
thin and irregularly inflated; styles 1.5-2 mm. long; septum re- 
duced to a narrow margin around the replum, areolae tortuous; 
ovules 2-4 in each cell, funiculi attached to septum; seeds flat- 
tened, not margined, large. 
Distribution: known as yet only from Sweetwater County in 
southwestern Wyoming. 
Specimens examined: 
Wyoming: naked clay flats and ridges, Bush Branch, Sweet- 
water County, June 10, 1900, A. Nelson 7081 (Rky. Mt. Herb., 
TYPE, Mo. Bot. Gard. Herb., and Geo. Osterhout Herb.); dry 
soil, 45 miles north of Point of Rocks, June 21, 1900, Merrill 
& Wilcox 568 (U. S. Nat. Herb. and Rky. Mt. Herb.). 
This is à quite distinct species apparently of restricted range, 
having its nearest relative in L. argentea. From that species it 
is amply distinct by the broader leaves, the procumbent instead 
of erect stems, and the fewer number of ovules in the cells. In 
all the specimens examined the septum is nearly obsolete, being 
reduced to à narrow margin within the replum. Bush Ranch is 
not far from Steamboat Mountain, near the base of which the 
type was collected. 
