Rydberg : Notes on Philotria Raf. 461 



A h, staminate and pistillate flowers ; 



IV. 



H. 



Jeffers 



Wallace 



Va., 1 892, / K. Small, sterile. Nash's specimens are the only ones 

 that have staminate flowers. The spathe is like that of P. an- 

 gustifolia, but larger, 5-6 mm. long, the anthers in the unopened 

 flower 2-2.5 mm - l° n g- The Udora canadensis Nutt. may repre- 

 sent the unisexal form of Elodea canadensis but all these unisexual 

 plants have narrower leaves than the specimens referred to the 

 latter. It may represent a distinct species ; if so, its name would 



Nutt allii 



based on this form. 



Ann. & Mag. Nat. Hist. II. 



1:85. 1848. 



This was described from specimens collected at Foxton Locks, 

 near Market-Harborough, Leicester, England. The plant was at 

 first looked upon as indigenous, but is now generally regarded as 

 introduced. Babington's specimens, like all those collected in 

 Europe, have only pistillate flowers ; staminate and hermaphrodite 

 ones are wholly unknown. The flowers have three oblong sepals 

 and petals, three sterile filaments and club-shaped entire or merely 

 emarginate stigmas, and oblong, obtusish leaves, sometimes as broad 

 as those of Elodea canadensis Michx., sometimes hardly broader than 



tkrv«« 'r rry - m « » \ r. .j.x - 7/.Y "D 1 ^ t-» ^ Vi rm 



Nuttallii 



— v wr v » w ^ w mw v wr ^^ mm ^m .^ -m ^ w ^ mm m v — 



°ut always obtuse. This may be the pistillate form of Elodea 

 canadensis, if this is polygamo-dioecious. The specimens in our 

 herbaria are all European: canal near Hasselt, Villefranche, 



Mehu : Lago di M 



l8 95, De-Tom; G6ta Elf, Sweden, 1899, C G. H. Thedenms ; 



Ostende, Belgium, 1871, E. Cosson ; Spree, Berlin, Germany, 1877, 

 teller & Retzdorff ; Leigh Park, Hampshire, England, 1850. 

 1 collected it myself in the 1 870*s at Skara, Sweden. 



Anacharis Nuttallii Planch. Ann. Sci. Nat. Bot. III. II : 74- 

 1 849. 



T Ws is based on Udora canadensis Nutt. Planchon distm- 

 gUlsh ed it from A. Alsinastrum by the oblong-linear, not oval- 



