HARRIMANELLA, A NEW GENUS OF HEATHERS 



571 



thus becoming quadrangular. The flowers of Cassiope occur singly 

 in the axils of the leaves, the pedicels bearing at the base four mem- 

 branaceous bracts ; each sepal has a transverse fold at the base as if 

 the organ had first been bent sharply backward, then at a slightly 

 higher point bent sharply forward again, a character best brought out 

 by a longitudinal median section of a sepal ; the corolla is not plaited 

 at the base and the usvially short lobes are recurved and not overlap- 

 ping in anthesis ; the anthers lie in a single plane ; and the style is 

 elongated, slender, and nearly cylindrical. The seeds may furnish a 

 generic character, as suggested by the conspicuous apical appendage 

 in Cassiope merteiisiana and the absence of any such appendage in 

 Harrunariella stelleria7za. 



Fig. 63. Cassiope mertensiana. a, flower, with part of calyx and corolla cut 

 a\vay(X5) ; ^^ diagram of flower; c, ovary and style (X5) ! ^> fruit (X2); e, 

 longitudinal section of fruit (X^) ; p, transverse section of fruit (X2) ; ^, seed 

 (Xio); ^< end of branch, showing leaves and position of flowers (X3)) *'. 

 outline of transverse section of leaf (Xio) > 7i bract from base of pedicel (Xs)- 



Of the ten species that have been referred to Cassiope, seven are 

 still referable to the genus as here restricted, two are referable to 

 Harrimanella, and one must be excluded from both. The species of 

 true Cassiope are distinguishable by their vegetative characters alone, 

 as indicated in the following key : 



Key to the Species of Cassiope, based on Leaf Characters. 



Leaves with a deep channel on the back. 

 Leaf margins with a few coarse bristles. 



C. ericoides (Pall.) D. Don. 

 Leaf margins pubescent or fimbriate, but without bristles. 



Proc. Wash. Acad. Sci., December, 1901. 



