1921] 
PAYSON—MONOGRAPH OF THE GENUS LESQUERELLA 161 
Distribution: State of Tamaulipas, Mexico. 
Specimens examined: 
Mexico: 
Tamaulipas: near Matamoras, April, 1831, Berlandier 884, 
2314 (Gray Herb. TYPE); San Fernando, Oct., 1830, Berlandier 
819, 2239 (Gray Herb.); Soto la Marina, March 2, 1902, Nelson 
6631 (U. S. Nat. Herb.). 
This species finds its nearest relative in L. argyraea and from 
it is at once separated by the stellate pods and the reduced 
number of ovules. L. Berlandieri is of especial interest because 
it is the only species of this group that has developed a stellate- 
pubescent pod. In aspect it is not unlike certain species of the 
Rocky Mountain region but is easily distinguished from any of 
them by the simple rays of the stellae. 
14. L. purpurea (Gray) Wats. Proc. Am. Acad. 23: 253. 
1888; Coulter, Contr. U. S. Nat. Herb. 2: 17. 1891; Wats. in 
Gray, Syn. Fl. N. Am. 1': 119. 
1895; Wooton & Standley, Contr. 
U. S. Nat. Herb. 19: 275. 1915; 
Armstrong, Field Book of West- 
ern Wild Flowers, 184. 1915. 
Vesicaria | purpurea Gray, 
Smithson. Contr. (Pl. Wright.) 5: 
14. 1853; Walp. Ann. 4: 196. 
1857; Torr. Bot. Mex. Bound. 
Survey, 33. 1859. 
V. purpurea Gray var. albiflora 
Torr. Bot. Ives’ Rept. 6. 1860. 
Alyssum purpureum Kuntze, 
Rev. Gen. Pl. 2: 931. 1891. 
Perennial, silvery stellate 
throughout, rays usually not 
forked, numerous, slightly coher- 
ent at base; stems decumbent ue Fig. 12. L. purpurea. Habit sketch 
erect, 1-4 dm. long, simple or x4. Trichomes x 25. 
sparingly branched ; terminal bud 
remaining undeveloped or producing only a short sterile shoot; 
radical leaves oblanceolate to oval, entire, repand or lyrately 
