1921] 
PAYSON—MONOGRAPH OF THE GENUS LESQUERELLA 191 
Griffiths 3531 (U. S. Nat. Herb.); Tucson, Feb. 20, 1892, Toumey 
66 (U. S. Nat. Herb.); Tucson, March 20, 1894, T'oumey (U. S. 
Nat. Herb.); Tucson Mountains, March 13-April 23, 1903, 
Griffiths 3493 (U. S. Nat. Herb.); campus, Univ. of Arizona, 
Tucson, March 14, 1903, T'hornber 369 (U. S. Nat. Herb. and 
Mo. Bot. Gard. Herb.); Santa Rita Range Reserve, May 19, 
1912, Wooton (U. S. Nat. Herb.); Santa Rita Forest Reserve, 
March 31-April 23, 1903, Griffiths 3905 (U. S. Nat. Herb.); 
Arivapa Canyon, March, 1873, Mohr (U. S. Nat. Herb.). 
Mexico: 
Chihuahua (?): Carrizalito Mountains, April 19, 1892, 
Mearns 5 (U. S. Nat. Herb.). 
L. Gordonii is a common plant throughout at least a large part 
of its range and occurs associated with other cruciferous weeds in 
waste places. Its distinguishing characteristics are the annual 
root, the sigmoid pedicels, and the shortly stipitate, globose, 
glabrous pod. Its nearest relative seems to be L. Palmeri with 
which it may be found to merge in Arizona. 
28. L. Palmeri Wats. Proc. Am. Acad. 23: 255. 1888; Wats. 
in Gray, Syn. Fl. N. Am. 1': 1 
1895. S es 
L. Gordonii (Gray) Wats. var. ses- To 
silis Wats. Proc. Am. Acad. 23:253. p 
1888; Coulter, Contr. U.S. Nat. Herb. y% 
2:18. 1891;Wats.in Gray,Syn.Fl. [f 
N. Am. 1': 120. 1895. | 
L. tenella A. Nels. Bot. Gaz. 47: | 
426. 1909. | 
Annual, stellae rather small, fre- \ 
quently sparse, rays numerous, forked \ 
at base, distinct, finely granular; 
stems slender, decumbent or erect, 
1-4 dm. long, in the larger plants 
usually branched; terminal bud de- 
veloping a normal, fertile stem; E 
radical leaves entire to lyrate with c. n vr cance p^ 
few lobes, 1-5 cm. long, narrowed 
to a slender petiole; cauline leaves linear to oblanceolate, entire 
or slightly repand, 1-5 em. long; petals yellow, broadly spat- 
