1921] 
PAYSON—MONOGRAPH OF THE GENUS LESQUERELLA 207 
habit of growth, more numerous ovules, straight or slightly 
curved pedicels, and more completely inflated pods separate it 
from both alpina and condensata. It is not so easily distinguished 
from L. arizonica, however, and further knowledge of these two 
species may result in the reduction of intermedia to varietal 
rank under arizonica. Such a change would seem unfortunate 
because intermedia is a plant of wide distribution, while arizonica 
is quite limited in range. It is believed also that the latter 
species has been derived from intermedia—a relationship that 
would not be suggested by making the parent group a variety 
of the derived form. 
39. L. arizonica Wats. Proc. Am. Acad. 23: 254. 1888; Wats. 
in Gray, Syn. Fl. N. Am. 1': 117. 1895; Armstrong, Field Book 
of Western Wild Flowers, 184. 1915. 
Cespitose perennial, densely stellate throughout, stellae small, 
rays distinct or irregularly coherent, forked at the base; caudex 
much branched; stems usually erect, 1.5-8 cm. long, anbranched; 
terminal bud either developing a fertile stem or remaining un- 
developed; radical leaves linear to oblanceolate, flat, entire, 
.5-2.5 em. long, the lowermost usually noticeably shorter than 
the ones immediately above; cauline leaves linear to oblanceolate, 
1-2.5 cm. long; petals yellow, narrowly spatulate, 6-7 mm 
long; filaments linear; fruiting inflorescence crowded and sub- 
corymbiform; pedicels straight or slightly curved, 4-8 mm. 
long; pods sessile, erect or ascending, stellate, ovate, 4-6 mm. 
long, acute but scarcely compressed at the apex; styles 1-2 mm. 
long; septum entire, nerved, areolae slightly tortuous; ovules 4 
in each cell, funiculi attached to septum for one-half their lengths 
or less; seeds not winged. 
Distribution: northwestern Arizona. 
Specimens examined: 
Arizona: Mokiak Pass, 1877, Palmer 43 (Mo. Bot. Gard. 
Herb.); Juniper Mountain, central Arizona, April, 1876, Palmer 
16 (Mo. Bot. Gard. Herb.); Ash Fork, May, 1883, Rusby 5141 
(U. S. Nat. Herb. and Mo. Bot. Gard. Herb.); Hackberry, 
May 26, 1884, Jones 4371 (U. S. Nat. Herb.). 
L. arizonica is very closely related to L. intermedia and is 
distinguished from it by the flat, shorter basal leaves and the 
