CANADIAN EANUNOULACEiE. 45 



Ranunculus hydrocharis hederœfoUus. Heirn, Batr. Kauxinc, Jour. Bot., IX, i>. 6*7. 



R. hederaceus. Biria, Hist., Reuoiic, p. 33. 



R. aquatilis, var. arcticus. Durand, Kano Exp., II., \). 44*7. 



R. hedej-aceo proximns. Giesecke, (Durand.) 



Newfoundland and Rooky Mountains. — Hiem. The Rocky Mountain plant with larger 

 flowers and more numerous stamens than in the type. Not rare in Europe. Disco and 

 adjacent coast, *70^. — Durand. 



3. — Ranunculus aquatilis, var. longikostris. 



Aquatic. Receptacle hairy. Stem weak, arched, rooting copiously at the joints. Leaves 

 all submerged, subsessile, (not cuneate-tlabelliform), segments capillary ; stamens 12-15. 

 Petals small, narrowly elliptic-ovate, faintly veined. Receptacle small, globose, hispid. 

 Stamens 12-15. Carpels 8-10, inflated on the peripheral side, with prominent recurved or 

 hooked beaks. 



Ranunculus hijdrocharh loii'^irodrh. Hieru, Batr. Ranun., Jour. Bot., IX, p. 100, (18*71.) 



R. longirosiris, Grodrou, Essai, f 9. (1839.) 



jR. aquatilis (var. trichophyUns?). Lawson, Monogr. Ranunc. Canad., p. 42, (1869.) 



In running water, creeks and ponds, Ganauoque River and Rideau Canal, Ont. ; 

 Yarker, Ontario, 1861. — Lawson. Canada West. — Drwniitond, Maconii. New Mexico. Ken- 

 tucky ; Cohimbia ; Missouri ; California. — ■Hiem, who also refers to this form, but apjiarently 

 with some hesitation, Dr. Lyall's specimens from Tobacco Plain, Kootenay, B. C. ; Burke's 

 from Rock River, Hudson Bay Territory ; and Bourgeau's from Saskatchewan. Occurs 

 exclusively in North America. — Hiem. 



4. — Ranunculus aquatilis, var. confervoides. 



Aquatic. Stem filiform. Leaves submersed and dissected, subsessile, segments 

 capillary, weak and collapsing (when taken out of the water). Peduncles equnlliuff the 

 leaves in length. Leaves, flowers and peduncles of small size. Stamens few (5-12). 

 Carpels short-beaked. Receptacle nearly cylindrical, hairy. 



Ranunculus hydrocharis confervoides. Hiern, Batrach. Ranunc, Jour. Bot., IX., p. 102, 

 (1871). 



R. confervoides. Fries, Summa Veg. Scan., I., p. 139, (1846). 



Batrachium confervoides. Fries, Bot. Not. An., 1845, p. 121. 



R.. paucistamineus, var. borealis. Beurl, Bot. Not., 1852, p. 156. 



Lake "Winnipeg. — Douglas. "Washington Territory ; North of Europe^, Iceland. 



5. — Ranunculus aquatilis, var. Drouetii. 



Difiers from the preceding var. {confervoides) in the fruit-receptacle being oblong (not 

 cylindrical), the stem slender but scarcely filiform, and is probably not distinct, as Mr. 

 Hiern indicates that in its Pacific and Cascade Mountain forms it approaches confervoides. 



Ranunculus hydrocharis Drouetii. Hiern, Batr. Ranunc, Jour. Bot., IX., p. 102. 



R. Drouetii, F. Schultz. 



