The Flora of the Cayuga Lake Basin 261 



N. S. to Minn., southw. to Pa., Ohio, 111., and Mo., and in the mts. to Ga. ; 

 rare or absent on the Coastal Plain. 



All specimens from the Cayuga Lake Basin, except one from a brackish field 

 near Montezuma, are var. Murrayanam Fernald (see Rhodora 25:99. 1923). The 

 achenes of the Montezuma plant are abundantly setose. 



3. G. strictum Ait. Yellow Avens. 



Moist thickets and fields, more frequently in calcareous gravels but also in other 

 rich soils; common. June 15-July 15. 



Nevvf. to B. C, southw. to N. J., Pa., 111., Mo., and N. Mex. ; rare or absent on 

 the Atlantic Coastal Plain. Found also in Asia. 



4. G. rivale L. Water or Purple Avens. 



Boggy springy places, in both calcareous and acid soils; frequent. May 15-June. 



Marshes of Danby (D.) ; near Key Hill; Inlet Valley, Ithaca-Newfield town 

 line; s. of Fall Creek, near Forest Home; e. of Slaterville; Ellis Hollow (£>.!); 

 Ringwood; marshes of Dryden (D.\) ; McLean Bogs. 



Lab. to Sask., southw. to n. N. J., Pa., Mich., and Colo., including the northern 

 Coastal Plain. Found also in Eu. 



17. Rubus (Tourn.) L. 23 



a. Leaves simple, 3-5-lobed ; stems unarmed ; petals very large, purple. 



1. R. odoratus 

 a. Leaves 3-7-foliolate ; stems with or without prickles ; petals white. 



b. Leaves white- tomentose beneath ; fruit separating easily from the receptacle ; 

 petals not longer than the sepals. 

 c. Canes erect, bronzy, bristly-prickly; plant stoloniferous ; fruit red. 

 d. Pedicels not setose. 2. R. idaeus 



d. Pedicels densely setose. 2a. R. idaeus, 



var. strigosus 

 c. Canes recurved, dark purple, glaucous, with stout hooked prickles ; plants in 

 clumps, not stoloniferous; fruit black. 3. R. occidentalis 



b. Leaves not tomentose beneath ; fruit not separating from the receptacle. 

 c. Petals scarcely longer than the sepals, narrow; plants herbaceous, unarmed; 



fruit purple-red. 4. R. pubescens 



c. Petals much longer than the sepals, broader ; canes woody, usually armed ; 

 fruit black. 

 d. Leaflets laciniate, thick; calyx prickly. 5. R. laciniatns 



d. Leaflets not laciniate ; calyx not prickly, or with an occasional prickle. 

 e. Young canes setose or with very slender prickles ; body of sepals about 

 3 mm. long; petals mostly less than 1 cm. long; leaves glabrous 

 beneath, or sparingly strigose on the veins. 

 /. Plants trailing; racemes short, few-flowered, lax, often leafy-bracted ; 



leaves subevergreen, firm, and often glossy. 6. R. hispidus 



f. Plants low-arching, often forming large beds ; racemes more 

 numerously flowered, more or less paniculate; flowers larger, often 

 double, frequently pinkish and fragrant ; leaves deciduous, though 

 rather firm. 7. R. jacens 



e. Young canes prickly or unarmed; body of sepals 5 mm. long or more; 

 petals mostly over 1 cm. long; leaves glabrous or velvety beneath, 

 thinner, not evergreen. 



-' Compare also Bailey, L. H., Sketch of the evolution of our native fruits, 1898; and Gentes 

 Herbarum, vol. 1, fasc. 4 and 5, 1923 and 1925. 



