The Flora of the Cayuga Lake Basin 243 



d. Fruits permanently inclosed in the receptacle; leaves pinnate. 

 c. Receptacle dry and woody ; plants herbaceous, not prickly. 



/. Receptacle top-shaped, ribbed, with hooked spines at the throat; flowers 



yellow. 19. Agrimonia 



/. Receptacle 4-angled, naked; flowers white or green. 20. Sanguisorba 

 e. Receptacle fleshy; plants woody, often prickly; flowers pink or white. 



21. Rosa 

 /'. Carpel 1; fruit a drupe; trees or shrubs with simple leaves. 22. Prunus 



1. Physocarpus Maxim. 

 1. P. opulifolius (L.) Maxim. (Neillia opnlifolia of Cayuga Fl.) Ninebark. 



Dry rocky ledges and talus of ravines and lake cliffs, in calcareous regions; common. 

 June 10-30. 



Rare in the ravines of the basin from Fall Creek southw., probably due to the less 

 limy nature of the rocks of that region. 



Que. to 111., southw. to Fla. and Tenn. ; rare in the noncalcareous parts of N. E. 

 and on the Coastal Plain. 



Physocarpus is in the list of nomina conservanda of the International Code. 



2. Spiraea (Tourn.) L. 



a. Leaves glabrous or sparingly pubescent beneath. 



b. Inflorescence tomentulose ; leaves oblanceolate, finely serrate ; twigs yellowish 



brown. 1. S. alba 



b. Inflorescence subglabrous or slightly villous ; leaves elliptical, more coarsely 

 serrate ; twigs reddish brown. 2. S. latifolia 



a. Leaves densely white- or tawny-tomentose beneath. 3. S. foment osa 



1. S. alba DuRoi. (S. salicifolia of Gray's Man., ed. 7, and of Cayuga Fl.) 



Meadow-sweet. 



Open marshlands, mostly in somewhat limy soils ; frequent. Aug.-Sept. 



Cayuta Lake ; Spencer Lake ; Inlet and Cayuga Marshes ; Canoga Marshes ; Free- 

 ville ; Mud Pond, McLean Bogs ; Chicago Bog ; and elsewhere. 



Ont. and N. Y. to Sask., southw. to N. C, Ind., and Mo. ; rare or absent on the 

 Coastal Plain. 



This plant is very closely related to S. salicifolia L. of Siberia and Japan, and by 

 many authors has been considered identical with it. It apparently differs from S. 

 salicifolia in the 'smaller, more generally white, flowers, and the more acute, more 

 sharply toothed, leaves. The width of the panicle, cited by some authors as a differ- 

 ence, is of little value as a diagnostic character. The flowers of the Siberian species 

 are nearly twice as large as those of S. alba and are generally purple. 



2. S. latifolia (Ait.) Borkh. Meadow-sweet. 



In situations similar to the preceding, but in more acid soils ; rare. July 15-Aug. 



Chicago Bog. 



Newf. to Sask., southw. to Va. and w. Pa.; the common meadow-sweet of N. E. 

 and the Coastal Plain. 



A large clump with pink flowers was found near an abandoned road at Grotto. 

 It may have been planted there. 



3. S. tomentosa L. Hardhack. Steeple Bush. 

 Low exsiccated sandy pasture land ; rare. July-Aug. 



N. w. corner of Dryden Township, 1918 (A. Gershoyl), confined to one field, 

 where it is abundant ; doubtfully native. 



N. B. and N. S. to Minn., southw. to the mts. of Ga. and to Kans. ; common in N. E. 

 and on the Coastal Plain. A plant primarily of light, somewhat acid, soils. 



