572 



COVII.LE 



Leaves with scattered pubescence on the back and margins, but 

 without membranaceous or fimbriate margins or a terminal 



bristle C. tetragona (L.) D. Don. 



Leaves without hairs or fimbriae except on the margins or in the 

 furrow. 

 Leaves with persistent white membranaceous fimbriate margins 

 connecting with a terminal acumination. 



C. fastigiata (Wall.) D. Don. 

 Leaves with the marginal fimbria: early deciduous, a slender 

 terminal bristle persistent. 



C. selaginoides Hook. f. & Thom. 

 Leaves not channeled on the back. 



Leaves not ciliate C. mertensiana (Bong.) D. Don. 



Leaves more or less ciliate on the margins or at the apex when young. 

 Leaves shining, armor-like, without white margins. 



C. redoivskii (Ch. & Schl.) G. Don. 

 Leaves dull, with white margins. 



C. lycopodioides (Pall.) D. Don. 



Of these species one, tetragona^ is circumpolar, two, fastigiata 



f 4 k 



Fig. 65. Cas.s.iope lycopodioides. 

 a, flower, with part of calyx and 

 corolla cut awayCXs); ^^ fruit 

 (X-); <"i longitudinal section of 

 fruit (X-)) ^> end of branch, 

 showing leaves and position of 

 flowers (X3) » «) outline of trans- 

 verse section "^ of leaf (Xio); /< 

 bract from base of pedicel (Xs)- 



and selaginoides^ are Himalayan ; two, ericoides and redoivskii^ be- 

 long to eastern Siberia ; one, lycopodioides^ extends from Alaska to 



Fig. 64. Cassiope tetragona. «, flower, 

 with part of calyx and corolla cut away 

 (X5); ^, fruit (X2); c, longitudinal sec- 

 tion of fruit (X2); d, end of branch, 

 showing leaves and position of flowers 

 (Xs); ^1 outline of transverse section of 

 leaf (Xio) ; y, bract from base of pedicel 

 (X5)- 



