176 



Davis. 



13*34, muricata X biennis. 13*33, biennis X muricata. 



Cotyledons. 6 — 7 mm. long as in biennis, Cotyledons. About 5 mm. long as in tmiri- 



but not so broad at the base, tapering to cata, but not so conspicuously cut away 



the petiole (Fig. 1, m X b). at the base (Fig. 1, 6 X m). 



Fig. f). Mature plant of biennis. Showing tlie numerous side branches from 



the rosette; a foliage of broadly-elliptical, almost plane leaves; tips of branches 



generally straight. Contrast with Fig. 7, muricata. 



Young rosettes. Leaves broadly-elliptical, Young rosettes. Leaves elliptical as in 



intermediate between the parents (Fig. 2, 

 muricata X biennis). 



Rosettes smaller than those of the pa- 

 rents of corresponding age. 

 Mature rosettes. 3 — 3'2 dm. broad. A 

 close duster of broadly-elliptical leaves, 



muricata but not so narrow (Fig. 2, 

 biennis X muricata). 



Rosettes smaller than those of the 

 parents of corresponding age. 

 Mature rosettes. About 2-h dm. broad. 

 A close cluster of narrow-elliptical leaves 



