460 Rydberg : Notes on Philotria Raf. 



As far as I know, it is dioecious. The leaves are narrowly linear, 

 acute, usually over i cm. long and about i mm. wide. The 

 spathe of the staminate plant is 2-3 mm. long, subsessile, ovoid ; 

 the sepals and petals are elliptic, 2 mm. long ; stamens 9 ; anthers 

 oblong, about i mm. long. Spathe of pistillate plant linear-tubu- 

 lar, about I cm. long ; tube of the flower 3-8 cm. long ; sepals 

 oblong, fully 1.5 mm. long ; stamens none (only rudimentary fila- 

 ments) ; stigmas 3, linear (whether 2-cleft or not cannot be 

 determined). The name Philotria angustifolia was given to it in 

 the Torrey herbarium. This name was taken up by me in my 

 Flora of Colorado, but there applied to another species. It is 

 represented by the following specimens : west side of 3d Ave., 

 New York City, 185 1, Dr. Torrey & Dr. Gilman [later than the 

 publication of Torrey's Flora of New York] , staminate and pistil- 

 late flowers; pool along Hudson River, below Hastings, 1895, 

 E. P. Bicknell, pistillate flowers ; brook from Fairy Dell, near 

 Quogue, Long Island, 1885, E. G. Knight, pistillate flowers; 

 Harrisburg, Pa., 1895, /. K. Small, sterile; Baltimore Co., Md., 

 1890, K. A. Taylor, pistillate flower (?), but only tube left; 

 McCall's Ferry, Pa., 1893,/ K. Small, sterile. To this may also 

 be counted the specimen of Moser mentioned above in the Torrey 

 herbarium, which has however somewhat broader leaves. If this 

 had hermaphrodite flowers, like the specimens seen by Caspary, 

 this species may have all three kinds of flowers. 



. Serpicula occidentalis Pursh, Fl. Am. Sept. i: 33. 18 14. 



This agrees with Elodea canadensis Michx. in description, 

 except that the leaves are described as linear and acute. There 

 is, however, no specimen with hermaphrodite flowers and linear 

 leaves in our collections, unless that of Moser had such. 



Udora canadensis Nutt. Gen. N. Am. PI. 2 : 242. 18 18. 



This is described as being dioecious, having staminate flowers 

 with 9 stamens, pistillate ones with 3 sterile filaments and 3 ligu- 

 late, bifid stigmas, and oblong-linear, partly obtuse leaves. 



This description fits a form somewhat similiar to the plants 

 referred to Elodea canadensis Michx., but with more narrowly 

 oblong, often somewhat acutish leaves. It is represented by the 

 following specimens: Clifton, Passaic Co., N. J. 1891, Geo. V. 



