1921] 
PAYSON—MONOGRAPH OF THE GENUS LESQUERELLA 151 
lands, Somerville County, April, 1882, Reverchon (Mo. Bot. 
Gard. Herb.); Waco, Pace (Mo. Bot. Gard. Herb.); Ft. Chad- 
bourn, 1856, Swift (U. S. Nat. Herb.) limestone barrens, Brown- 
wood, Brown County, March 31, 1917, Palmer 11429 (Mo. Bot. 
Gard. Herb.); dry hills, Austin, May 20, 1872, Hall 19 (Mo. 
Bot. Gard. Herb.); sandy open ground, Fredericksburg, Gil- 
lespie County, June 5, 1916, Palmer 10076 (Mo. Bot. Gard. 
Herb.); Frederieksburg, May 9, 1899, Bray 285 (U. S. Nat. 
Herb.); gravelly banks of rivulets near Fredericksburg, May, 
1847, Lindheimer 577 (U. S. Nat. Herb. and Mo. Bot. Gard. 
Herb.); sandy soil on the lower Guadalupe, near Victoria, Feb., 
1845, Lindheimer 328 (Mo. Bot. Gard. Herb.) ; Womack, Victoria 
County, April 11, 1900, Eggert (Mo. Bot. Gard. Herb.); sandy 
open ground, Victoria, March 13, 1916, Palmer 9158 (Mo. Bot. 
Gard. Herb.). 
This species is of interest particularly because of the short, 
crowded inflorescence, a character that is carried a step farther 
in the subumbellate inflorescence of L. Engelmanni. From 
that species the annual habit also distinguishes L. densiflora. 
L. argyrea is similar in many ways to the present species but the 
former is distinctly perennial, the inflorescence elongated, and 
the pedicels usually sigmoid. L. gracilis has the annual habit 
of L. densiflora, but there again the inflorescence is elongated. 
In the stellae is to be found a character that serves definitely 
to separate this species from any other with which it might be 
confused except L. Engelmannii. In these two species the 
radial symmetry of the star is broken by a deeper U-shaped fork 
on one side—a character easily understood by comparison of 
the drawings of the stellae of the species under discussion. 
8. L. Engelmannii (Gray) Wats. Proc. Am. Acad. 23: 254. 
1888; Coulter, Contr. U. S. Nat. Herb 2: 18. 1891; Wats. in 
Gray, Syn. Fl. N. Am. 1': 120. 1895; Small, Fl. Southeastern 
U.S.471. 1903, and ed. 2.471. 1913; Nelson in Coulter & Nelson, 
Manual Cent. Rocky Mountains, 219. 1909 (in part); Rydb. 
Fl. Rocky Mountains, 333. 1917. 
Vesicaria Engelmannii Gray, Gen. Am. Bor.-Or. Ill. 1: 162. 
i. 70. 1848; Gray, Bost. Jour. Nat. Hist. (Pl. Lindh.) 6: 144. 
1850; Walp. Ann. 2: 39. 1851; Gray, Smithson. Contr. (Pl. 
Wright.) 3: 110. 1852. 
