374 THE EVOLUTION OP OUR NATIVE FRUITS 



two inches across), and leaf -like sepals. This is represented 

 in cultivation by the Lucretia dewberry, which is a native of 

 West Virginia. (See pages 332-335.) I am in doubt as to 

 whether this variety actually occurs 

 in the wild state except in the 

 form of the original Lucretia ; that 

 is, it may be a mere incidental va- 

 riation from a single plant, from 

 which we have derived a cultivated 

 stock, rather than a true geograph- 

 ical form. It is very well marked in 

 cultivation. It is possible that the 

 variation has been brought about 

 by domestication. 



Var. MICHIGANENSIS Card in 

 herb. (Fig. 76, p. 351.) 



A robust form, with woody 

 stems and comparatively few weak 

 recurved prickles, and strong, up- 

 right, pubescent flower-shoots, long 

 stipules and very large leaflets, 

 which are very deeply and irregu- 



Fig. 85. Lucretia. One-third size, larly cut. This plant has been col- 

 lected by myself on the sandy banks 



of Lake Michigan, in southwest Michigan, where it seems to be 



distinctly marked. 



2. RUBUS INVISUS. B. Canadensis var. invisus Bailey, Amer. 

 Gard. xii. 83 (1891). (Fig. 75, 86.) 



A very well-marked dewberry, with somewhat ascending and 

 not very prickly stems, a light-colored foliage, and large, thinnish 

 leaflets which are coarsely and simply toothed ; peduncles forking 

 into two or three parts ; pedicels long, the flowers large, and 

 sepals leaf-like. This plant grows upon banks and along roads 

 from New York to Alabama and west to Kansas and Missouri. 

 The large, simple notches in the leaves, and the long, forking 

 flower-clusters readily distinguish this plant from its fellows. 



