1921] 
PAYSON—MONOGRAPH OF THE GENUS LESQUERELLA 157 
slightly tortuous; ovules 6-8 in each cell, flat, not winged, funi- 
euli rather short, attached to septum for about one-half their 
lengths. 
Distribution: Greenland, Ellesmereland, and the arctic coast 
of America at least as far west as the Mackenzie River; extending 
southward on the coast of Labrador. 
Specimens examined: 
Greenland: Drejer (Mo. Bot. Gard. Herb.); Nettik, Aug. 4, 
1861, Hayes 10 (U. S. Nat. Herb.); Itiblu Whale Sound, 1891, 
Burk 7 (U. S. Nat. Herb.); Borden Bay, Aug. 25, 1901, Stein 
174 (U. S. Nat. Herb.); Borden Bay, Aug. 26, 1901, Stein 176 
(U. S. Nat. Herb.) ; northeast coast about 76° 45’ N. Lat., June 
6, 1908, Andr. Lundarr (U. S. Nat. Herb.); Kangerdluarsuk 
kingua 74? 18’, July 28, 1887, Ryder (Mo. Bot. Gard. Herb.); 
Nugsuak Patut, July, 1909, Porsild (Mo. Bot. Gard. Herb.). 
11a. Var. Purshii Wats. Proc. Am. Acad. 23: 254. 1888; 
Wats. in Gray, Syn. Fl. N. Am. 1': 120. 1895; Britton & 
Brown, Ill. Fl. 2: 138. 1897, and ed. 2, 2: 156. 1913; Fernald, 
Rhodora 13: 223. 1911. 
A more slender plant than the species and with narrower 
leaves. Watson described the variety as having an entire sep- 
tum in eontradistinction to the species which was thought to 
have a perforate septum. This character is apparently of no 
value, since specimens of typical arctica are at hand that show 
no perforation. Frequently a few scattering stellae may be 
found on the otherwise glabrous pods, a character occurring 
more rarely in the species. From available material the variety 
seems to have but 5-6 ovules in each cell, while the species has 
6-8. This, of course, is of slight value for identification but is 
of interest in its phylogenetic significance. This plant (var. 
Purshii) is, according to Fernald, a typical calciphile. Few 
flowering plants penetrate nearer the pole than L. arctica. 
Distribution: Anticosti Island in the Gulf of St. Lawrence 
and western Newfoundland. 
Specimens examined: 
Newfoundland: dry limestone barren, Table Mountain, Port 
au Port Bay, July 16 and 17, 1914, Fernald & St. John 216 (Mo. 
Bot. Gard. Herb., Deam Herb., and Rky. Mt. Herb.) ; dry lime- 
