290 



leaved; involucels small, entire; rays about 4, nearly etiual, 12 to 18 mm. long; 

 pedicels of fruit about 2 mm. long; carpels a little compressed dorsally; ribs 

 prominent, nearly equal; oil tubes 2 or 3 in the intervals, 2 to 4 on the commis- 

 flural aide; fruit broadly ovate, 4 mm. ioiig, purplish; seed face plane. 



Common at Cape Vancouver, Alaska, but not seen elsewhere. Collected by 

 J. M. Macoun, September 8, 1890, for whom it is named. In its low habit it ia 

 very different from all other North American species. 



Explanation of Plate xxni.— Plant natural size; a, cross section of carpel, enlarged 8 

 dlametera; b, carpel as seen from dorsal aide, enlarged 3 duunetera> 



