54 B 



Canadian Arctic Expedition, 1913-18 



Pleurogyne Esch. 



While p. rotata Griseb. has been recorded from quite a nuraber of stations 

 on this continent, viz. : Labrador and Hudson bay to the high-northwest coast, 

 Kotzebue sound, etc., and the Rocky mountains south to lat. 39 , P. canntluaca 

 Griseb. has not with certainty been observed here; Gray and Macoun have 

 credited a variety fusilla Gray to Labrador and the alpme region of the White 

 mountains of New Hampshire (Pursh), but according to Robinson and Fernald,^ 

 the American P. rotata includes P. carinthiaca var. pusilla, which by Macoun 

 has been reported from Anticosti and some few stations in Quebec. Meanwhile 

 both species were collected by the Canadian arctic expedition, and since .P. 

 carinthiaca has been confused with the other, some brief notes on their distinctive 

 characters may be appropriate. Both were described by Grisebach, viz.: 

 "P. rotata, foliis lanceolatis linearibusque, sepalis lanceolato-linearibus corollam 

 aequantibus, ovario acuto, seminibus suturalibus," and "P. carinthiaca, folus 

 ovalibus oblongisque, sepahs ovatis corolla duplo brevioribus, ovario obtuso, 

 seminibus prope suturam insertis." A specimen from Bernard harbour of P. 

 carinthiaca has been drawn on Plate XI, fig. 3 (Can. Arct. Exp., Vol. 5, pt. A), 



10 



Figure 0. 



Pleurogyne carinthiaca Griseb.; a flower; one and two-thirds times natural size; specimen from 

 Almagell, Valais, Switzerland. 2. Stem-leaf of same specimen; one and two-thirds times 

 natiu'al size. 3. Same species; specimen from mouth of Mackenzie river; natural size. 4. 

 Same species; a corolla-lobe; one and two-thirds times natural size; specimen from Bernard 

 harbour. 5. Calyx-lobe of same specimen; one and two-thirds times natural size. 6. Pleu- 

 rogyne rotata Griseb.; a flower; one and two-thirds times natural size; specimen from Bath- 

 urst inlet. 7. Stem-leaf of same specimen; one and two-thirds times natural size. 8. Same 

 species; an open flower; specimen from Blagowjestschensk, Amur; one and two-thirds times 

 natural size. 9. A closed flower of same specimen; one and two-thirds times natural size. 

 10. Stem-leaf of same specimen; natural size. 11. Same species; a flower; specimen from 

 near Twin lakes, LeadvUle, Colorado; altitude 9,265 feetj one and two-thirds times natural 

 size. 12. Same species; a flower; one and two-thirds tunes natural sizej specimen from 

 Churchill, Hudson bay. 13. Same species; a flower; one and two-thirds tmies natural size; 

 specimeiKfrom the same locality. 14. A stem-leaf of same specimen; natural size. 



1 Gray's New Manual of Botany. 1908, p. 659. 



2 Catalogue of Canadian Plants, Part II. Montreal, 1884, p. 325. 



3 Genera et species Gentianearum;. Stuttgart, 1839, p. 309. 



