1921] 
PAYSON—MONOGRAPH OF THE GENUS LESQUERELLA 167 
Utah: Barton's Range, San Juan County, July 16, 1895, 
Eastwood 8 (U. S. Nat. Herb. and Mo. Bot. Gard. Herb.) ; can- 
yon above Tropie, May 28, 1894, Jones 5302a (U. S. Nat. Herb.). 
Arizona: Andrade, March 13-April 23, 1903, Griffiths 4074 
(Mo. Bot. Gard. Herb.); Holbrook, Oct. 9, 1897, Zuck (U. S. 
Nat. Herb. and Mo. Bot. Gard. Herb.); Holbrook, July 30, 
1896, Zuck (U. S. Nat. Herb.); Holbrook, 1901, Hough 59 (U. 
S. Nat. Herb.); 5 miles northeast of Holbrook, June 20, 1901, 
Ward (U. S. Nat. Herb.); near Springerville, June 25, 1892, 
Wooton (U. S. Nat. Herb.); rocky slopes near Douglas, May, 
1907, Goodding 2228 (Rky. Mt. Herb.); rocky slopes, Mule 
Mountains, Bisbee, April, 1909, Goodding 74 (Rky. Mt. Herb.). 
Mexico: 
Coahuila and Nuevo Leon: Feb. to Oct., 1880, Palmer 31 
(U. S. Nat. Herb.). 
Nuevo Leon: mountains west of Icamole, Feb. 3, 1907, Saff- 
ord 1261 (U. S. Nat. Herb.). 
Coahuila: Agua Nueva, April 18, 1905, Palmer 558 (U. S. 
Nat. Herb. and Mo. Bot. Gard. Herb.); vicinity of Saltillo, 
May, 1898, Palmer 18214 (U. S. Nat. Herb.); Sierra de Parras, 
March, 1905, Purpus 1025 (Baker Herb. at Pomona College, 
and Mo. Bot. Gard. Herb.); Sierra de la Paila, Oct., 1910, Pur- 
pus 4926 (U. S. Nat. Herb. and Mo. Bot. Gard. Herb.); Oro, 
Aug. 18, 1903, Rose & Painter 6430 (U. S. Nat. Herb.); La Ven- 
tura, Aug. 2-5, 1896, Nelson 3919 (U. S. Nat. Herb.); Agua 
Nueva, Feb. 14, 1847, Gregg 91 (Mo. Bot. Gard. Herb.) ; Buena- 
vista, Feb. 19, 1847, Gregg 304 (Mo. Bot. Gard. Herb.). 
Chihuahua: St. Diego, April 10, 1891, Hartman 615 (U. S. 
Nat. Herb.); Santa Eulalia Mountains, March 29, 1885, Pringle 
176 (U. S. Nat. Herb.). 
Zacatecas: near Conception del Oro, Aug. 11-14, 1904, Palmer 
277 (Mo. Bot. Gard. Herb. and U. S. Nat. Herb.); Hacienda de 
Cedros, 1908, Lloyd 236 (U. S. Nat. Herb.). 
L. Fendleri is certainly the most polymorphic species in this 
genus and yet there seem to be no natural lines of cleavage along 
which the species may be separated even varietally. Some 
strikingly different forms occur and it is possible to sort any 
considerable number of specimens into several distinguishable 
groups. If these groups are examined, however, the repre- 
