FLOKA OF THE DISTRICT OF COLUMBIA. 209 



The typical form of the species has broadly triangular leaves, with coarse teeth or 

 lobes at the base; the earliest leaves are usually finely and almost evenly toothed, 

 and they are narrower than the later ones. 



Viola emarginata X fimbriatula Brainerd. 



Frequent with V. emarginata. The leaves resemble those of either parent, but 

 they are more pubescent than in V. emarginata and less so than in V. fimbriatula. 



Viola emarginata X hirsutula Brainerd. 



Takoma Park. Leaves in shape like those of V. emarginata, but with the peculiar 

 pubescence of V. hirsutula. {V. emarginata villosa House.) 



Viola emarginata X papilionacea House. 



Takoma Park (the type locality) and Glen Carlyn. The leaves resemble those of 

 V. papilionacea, but they are more deeply toothed near the base. 



Viola emarginata X sagittata Brainerd. 



Frequent with the parent species. Both V. emarginata and V. sagittata are glabrous 

 and the hybrid differs only in having the leaves intermediate in form between the two. 



11a. Viola emarginata acutiloba Brainerd. 



Brookland, Takoma Park, and Hyattsville. Distinguished from the sjjecies by 

 having the mature leaves 5-cleft or 5-parted, the middle lobe lance-oblong, the lateral 

 and basal lobes also long, but shorter than the terminal one. It is known from Staten 

 Isl., N. Y., and from our region. 



Viola emarginata acutiloba X fimbriatula Brainerd. 



Brookland. In outline the leaves resemble those of V. emarginata acutiloba, but 

 they are more or less piibescent. 



Viola emarginata acutiloba X papilionacea Brainerd. 



Brookland. Leaves in outline almost like those of V. papilionacea, but the 

 margins deeply lobed in the lower half or two-thirds. 



Viola emarginata acutiloba X sagittata Brainerd. 



Takoma Park and Hyattsville. Leaves in outline much like those of V. sagittata, 

 but slightly broader and with few deep narrow lobes at the base. 



12. Viola sagittata Ait. Arrow-leaf violet. 

 Moist woods or meadows; common. Apr.-May. Northern states, south to Ga. 

 The leaves and stems are usually glabrous, but sometimes finely pubescent. 



13. Viola fimbriatula J. E. Smith, 



Dry fields and hillsides, chiefly on the Coastal Plain; common. Apr.-May. East- 

 em N. Amer. (V. ovata Nutt.; V.' sagittata hicksii Pollard; V. sagittata of Ward's 

 Flora, in part.) 



Viola fimbriatula X papilionacea Brainerd. 



Along the Potomac and Eastern Branch. Leaves similar to those of V. papilionacea 

 but narrower, sometimes slightly lobed at the base, and more or less pubescent. 



Viola fimbriatula X sagittata Brainerd. 



Rather widely distributed in our region. Lea^^es in outline intermediate between 

 those of the two species and very variable, usually copiously pubescent. ( V. sagittata 

 of Ward's Flora, in part.) 



Another hybrid, V. fimbriatula X villosa {=hirsutula Brainerd) was reported by 

 House from Takoma Park. No material has been seen by the writer. 



14. Viola stoueana House. 



Usually in thin moist woods; frequent. May. N. J. to Md. (F. septemloba of 

 many authors, not of Le Conte; V. cucullata palmata of Ward's Flora, in part.) 



Viola stoneana X triloba Brainerd. 



Widely distributed in our region. Leaves cut as in V. stoneana, but more or less 

 pubescent as in V. triloba. 



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