MONOECIA— POLYANDRIA. Myriophyllum. 143 



pas 4-, oblong, with a thin coat. Nuts solitary, with a 

 hard thick shell, containing a solitary kernel, in a simple 

 skin. Gcertner. 



Gaertner observes that this genus is evidently dicotyledo- 

 nous. Its natural order is no less evidently what Mr. 

 Brown has called Haloragece. 



The species are all aquatic and herbaceous, with whorled, 

 pinnatifid leaves, and whorled, or axillary,^otu^5, whose 

 organs are not always altogether separated. 



1. M. spicatum. Spiked Water-Milfoil. 

 Flowers in whorled, interrupted, leafless spikes. 



M. spicatum. Linn. Sp. PL 1409. Willd.v. 4. 406. Fl. Br. 1021. 



Engl. Bot. V. 2. t. 83. Hook. Scot. 2/2. Fl. Dan. t. 681. 

 Pentapteris n. 993. Hall. Hist. v. 1 . 424. 

 Potamogiton foliis pennatis. Raii Syn. 150. 

 Millefolium aquaticum pennatum spicatum. Bauh. Prodr.73.f. 

 M. pennatum aquaticum. Bauh. Hist. v. 3. p. 2. 775. f. 

 Feather Pondweed. Petiv. H. Brit. t. G.f.D. 

 /S. Millefolium aquaticum pennatum minus, foliolis singularibus 



latiusculis flosculis subjectis, donatum. Moris, v. 3. 622. sect. 1.5. 



t. 4.f. 7. Dill, in Raii Stjn. 151. 

 Fine Feather Pondweed. Petiv, H. Brit. t. 6.f. 6. 

 In ditches and pools frequent. 

 /3. In a ditch near Lodden bridge, not far from Reading. J. Bo- 



bart. In the river on Hounslow heath. Doody. 

 Perennial. July, .August. 

 Herb smooth, floating under water, with branching, round stems, 



and dark-green, finely pinnatifid, spreading leaves, 4 in each 



whorl. Fl. in several whorls, rising above the surface, on simple, 



terminal, leafless branches, with 4 small entire hracteas under 



each whorl. Cal. acute, finely fringed. Pet. reddish. 

 The variety /3, with one large simple obovate leaf under each 



whorl ofjlowers, if Morison's plate be correct, is very remarkable. 



It has not fallen in my way. 



2. M. verticillatum. Whorled Water-Milfoil. 

 Flowers all axillary. 



M. verticillatum. Linn.Sp.Pl.XW^. Willd.v. 4. 4^7 . Fl.Br.\022. 



Engl. Bot. V.4. ^ 218. Fl. Dan.t. 1046. Ehrh. Herb. 60. 

 M. aquaticum minus. Clus. Hist. v. 2. 252./. Pann. 71 1 ./ 712. 

 Pentapteris n. 992. Hall. Hist. v. 1 . 424. 

 Pentapterophyllon aquaticum, flosculis ad foliorum nodes. Dill. 



Giss.]]2. append. 126. t.7. Raii Syn. 316. 

 Millefolium aquaticum minus. Bauh. Hist. v.3.p. 2. 775./. 



