[Vol. 8 
178 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
the species does occur rarely west of the Continental Divide. 
It would seem that the comparatively low break in the north 
and south line of the Rockies that occurs across southern Wyo- 
ming made possible the migration of this species far from its 
point of origin. 
The record from Illinois by Gleason is the most remarkable 
extension of range known for any species of Lesquerella. The 
single plant collected is fragmentary and imperfect owing to 
the season being so far advanced at the time that the collection 
was made. Collections made early in the summer may show 
characters not possessed by this specimen, but at present there 
seems no reason to regard it other than typical argentea. The 
plants occur ‘‘in considerable numbers" on sand dunes about 
twelve miles northeast of Havana. 
From L. recurvata and L. aurea, this species is separated by its 
perennial habit of growth and its densely stellate pods. From 
L. macrocarpa and L. purpurea, with which it may also be con- 
fused because of the recurved pedicels, it is distinguished by the 
narrow basal leaves. A few specimens have been seen in which 
the pedicels were straight and ascending but this is evidently a 
rare variation. 
22. L. arenosa (Richards. Rydb. Bull. Torr. Bot. Club 29: 
236. 1902; Rydb. Fl. Rocky Mountains, 333. 1917; Berg- 
man, Fl. North Dakota, 191. 1918. 
Vesicaria arenosa Richards. Franklin's Journey to the Shores 
of the Polar Sea, 743. 1823; DC. Prodr. 1: 160. 1824. 
V. arctica Hook. Bot. Mag. 3: t. 2882. 1829. 
V. arctica var. 8. Torr. & Gray, Fl. N. Am. 1: 100. 1838; 
Hook. Fl. Bor. Am. 1: 48. 1840. 
V. ludoviciana Macoun, Cat. Canadian Pl. 1: 54. 1883. 
Lesquerella ludoviciana (Nutt.) Wats. var. arenosa Wats. 
Proc. Am. Acad. 23: 252. 1888; Wats. in Gray, Syn. Fl. N. 
Am. 1’: 118. 1895. 
L. argentea arenosa Rydb. Contr. U. S. Nat. Herb. 3: 485. 
896 
L. versicolor Greene, Pittonia 4: 310. 1901; Rydb. Fl. Rocky 
Mountains, 333. 1917. 
