264 Karl M. Wiegand and Arthur J. Eames 



N. S. to Pa. and Ohio ; rare or absent on the Coastal Plain. 



Plants referred to this species are variable and have every appearance of being 

 hybrids between R. allegheniensis and R. flagellaris; see discussion under the latter 

 species. 



10. R. canadensis L. 



Dry thickets, in light neutral or acid soils ; frequent. June. 



Ravine s. of Cayuta Lake ; Caroline Center, common ; Michigan Hollow ; Lake 

 Como; Mud Creek, Freeville; border of open bog, McLean Bogs; Townley Swamp; 

 Spring Lake ; near Featherbed Bog. 



Newf. to Lake Superior, southw. in the uplands to N. C. • 



11. R. pergrarus Blanchard. 



Thickets, fence rows, and old pastures, mostly in gravelly soils ; scarce. June. 

 Around McLean Bogs ; near McKinney Twin Glens ; and probably elsewhere. 

 Me. to Ont., southw. to N. Y. and Iowa; rare or absent on the Coastal Plain. 

 Appearing like a hybrid of R. allegheniensis and R. flagellaris. 



12. R. allegheniensis Porter. (Chiefly R. villosus of Cayuga Fl.) Common Black- 

 berry. 



Dry banks and thickets, in gravel or mixed clay and gravel ; common. June. 

 N. S. to Ont., southw. to Va. and N. C. ; frequent on the northern Coastal Plain. 

 This plant apparently hybridizes freely with other species of blackberry and with 

 the dewberry. 



18. Dalibarda (Tourn.) L. 

 1. D. repens L. 



Low woodlands, in damp humus, in gravelly calcareous soils ; frequent. July-Aug. 



Mostly about sphagnum swamps and in hemlock woods : Michigan Hollow Swamp 

 (D. !) ; w. of Key Hill; Enfield Glen (D.) ; Fir Tree Swamp, Freeville; w. 

 of Dryden Lake; Mud Creek, Freeville; Malloryville Bog; Beaver Brook; and 

 elsewhere. 



N. B. to Minn., southw. to n. N. J., Pa., Ohio, and Mich. ; rare or absent on the 

 Coastal Plain. 



19. Agrimonia (Tourn.) L. 



a. Leaves sparsely hirsute or subglabrous beneath ; rhachis of the inflorescence glandu- 



lar-puberulent and hirsute or glabrous; bristles of the fruit 1.5-4 mm. long, 



spreading. 



b. Mature hypanthium 5-6 mm. in diam., strongly striate ; bristles in many rows, 



the longer bristles 3.5-4 mm. long; petals 4 mm. long; plant stout; root not 



tuberous; leaf clearly atomiferous beneath. 1. A. gryposepala 



b. Mature hypanthium 2.5-2.8 mm. in diam., faintly striate; bristles in 3-4 rows, 



the longer bristles 1.5-1.8 mm. long; petals 3 mm. long; plant slender; root 



often tuberous-thickened; leaf obscurely atomiferous beneath. 



2. A. rostellata 

 a. Leaves short-pubescent beneath, at least on the veins ; rhachis of the inflorescence 

 finely pubescent, rarely somewhat hirsute, the hairs not glandular ; bristles of the 

 fruit 2.2 mm. long or less. 

 b. Leaves obscurely or not at all atomiferous beneath, very downy; root tuberous; 

 hypanthium 3 mm. long, with an inconspicuous border and somewhat spreading 

 or connivent bristles which are often reddish; stipules reniform, evenly several- 

 toothed ; petals 3 mm. long. 3. A. mollis 

 b. Leaves plainly atomiferous beneath, downy principally on the veins ; root not 

 tuberous. 



