RvuBERG : Notes on Piiilotria Raf. 461 



Nash, staminate and pistillate flowers ; Ikiffalo, N. Y., G. IV. Clin- 

 ton, pistillate; Kendall, Orleans Co., N. Y., 1878, //. ^. Burnett ; 

 Lake View, Jefferson Co., 1891, Undertvood, pistillate ; Fish Creek, 

 Oneida Lake, N. Y., 1890, (Jndertvood, pistillate ; Wallace Switch, 

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

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

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

 flower 2-2.5 n''"^- lo"g- 'r^i^ 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 

 be Philotria Nuttallii, as Anacharis Nuttallii Planch, was mostly 

 based on this form. 



Anacharis Alsinastrum Babingt. Ann. & Mag. Nat, Hist. IL 



i: 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 o{ Elodea canadeiisis Michx., sometimes hardly broader than 

 those of Udora canadensis Nutt. or Anacharis Nnttallii Planchon, 

 but always obtuse. This may be the pistillate form of Elodea 

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

 herbaria are all P2uropean : canal near Hasselt, Villefranche, 

 Rhone, France, 1874, A. Mchu ; Lago di Manlova, Maggio, Italy, 

 1895, De-Toni ; Gota Elf, Sweden, 1899, C. G. H. Thedenius ; 

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

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

 I collected it myself in the 1870's at Skara, Sweden. 



Anacharis Nuttallii Planch. Ann. Sci. Nat. Bot. III. 11 : 74. 



1849. 



This is based on Udora canadefisis Nutt. Planchon distin- 

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



