VERMONT FLORA. 23 1 



eases with such a diagnosis, might have their severity 

 increased by a an increase of ozone, even if an increased 

 amount did not induce them. Further as ozone is fully 

 settled to be one of the elements of our atmosphere a 

 want of or a minimum quantity of s.ich an active agent 

 might cause diseases of an opposite character. 



( Cuiitiiiucd in the next tnimber.) 



Catalogue of tJie Flo-werbig Plants of Vermont. — By 

 Professor George M. Perkins^ Ph. D. — Cofitinued 



from page 3 18. 



Order.— ROSACE.^. 



Geum album, Gmel. White Geum. Not common; 

 borders of groves and about fences ; May. 



G. ViRGixiAXUM, L. Avois. Geum. Low ground 

 and damp woods ; not very common ; June. 



G. STRiCTUM, Ait. Low ground ; not common ; June. 



G. R I VALE, L. Purple Geum. Water Avens. Swamps 

 and moist places ; common ; June. 



Waldsteinia fragarioides, Tratt. Barren Straw- 

 berry. Very common along the borders of woods ; 

 middle of May. 



POTENTILLA NoRVEGiCA, L. Cinque-foH. Fields ; 

 common ; June. 



P. Canadensis, L. Com?non Cinquefoil. Common 

 in dry fields, pastures and roadsides ; May. 



P. argentea, L. Silvery Cinquefoil. Common in 

 fields and along roadsides ; June. 



