MEMOIRS FROM THE DEPAETMENT OF BOTANY OF COLUMBIA UNIVERSITY 167 



the flowers of this group, but the leaves are generally rather thin, and the plant stands 

 otherwise nearer to F. Calif ornica than to F. Chiloensis. Thinner leaved f(jrms of F. 

 Chiloensis, which frequently occur, approach F. platypetala n. sp. {F. Virginiana of 

 western botanists). The latter is sometimes quite hard to distinguish from F. bracteata 

 Heller {F. vesca of the Pacific coast botanies), and hence connects the groups of Fragariae 

 with pitted fruit with those with superficial achenes. Another connecting link is formed 

 by F. pumila, which approaches F. Mexicana. 



It has therefore seemed best to abandon all division into groups and to arrange the 

 species in the following artificial key : 



KEY TO THE SPECIES. 



Flowers erect or spreading, nodding only in fruit, white. 



Leaves thick and coriaceous, silky and tomentulose beneath. 

 Leaflets cuneate ; flowers 1.5-2 cm. in diameter. 



Pubescence spreading. 1. F. cuneifolia. 



Pubescence appressed. [19. F. firma.] 



Leaflets broadly obovate, the lateral ones very oblique ; flowers 2-3.5 cm. in diameter. 

 Leaves generally very thick, strongly reticulate beneath. 2. F. Chiloemis. 



Leaves thinner, not sti'ongly reticulate. 3. F. crinita. 



Leaves generally thin, not at all tomentulose. 



Pubescence of scape and petioles divaricate, i. e., generally spreading at right angles or some- 

 what reflexed (scanty and less spreading in No. 8). 

 Leaves densely silky beneath ; fruit slightly pitted. 



Flowers over 2 cm. in diameter. 3. F. crinita. 



Flowers 1-1.5 cm. in diameter. 



Leaflets broadly rounded or rhombic-ovate. 4. F. Californica. 



Leaflets oblong-obovate or cuneate. 5. F. Mexicana. 



Leaves slightly silky beneath, in age glabrate. 

 Leaflets subsessile ; achenes superficial. 



Leaves somewhat firm, never glaucous ; fruit inclined to be hemispheric. 



6. F. vesca. 

 Leaves very thin, often somewhat glaucous ; fruit inclined to be ovoid or sub- 

 conic. 

 Calyx in fruit spreading ; scape generally with long divaricate hairs and a 

 leafly bract ; flowers 1.5-2 cm. in diameter. 7. F. bracteata. 



. Calyx in fruit reflexed ; scape slightly silky or glabrate, generally without a 

 leafy bract ; flowers less than 1.5 cm. in diameter. 8. F. Americana. 

 Leaflets generally petiolate ; achenes set in deep pits (in Ifos. 9 and 10 unknown). 

 Leaflets 3-7-toothed at the apex only, generally only the terminal one petiolate. 



9. jF. sibbaldifolia. 



