MONOECIA— POLYANDRIA. Myiiophyllum. 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 Halorageoe. 



The species are all aquatic and herbaceous, with whoried, 

 pinnatifid leaves, and whoried, or axillary, ^o'KJej'S, whose 

 organs are not always altogether separated. 



1. M. spicattim. Spiked Water-Milfoil. 

 Flowers in whoried, interrupted, leafless spikes. 



M. spicatum. Linn. Sp.Pl. 1409. WiUd.v.4. 406. Fl. Br. 1021. 



Engl. Bot.v.2.t. 83. Hook. Scot. 272. FL Dan.t.68l. 

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

 Potamogiton foliis pennatis. RaiiSyn. 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. 6./. 5. 

 /3. Millefolium aquaticum pennatum minus, foliolis singularibus 



latiusculis flosculis subjectis, donatum. Moris, u. 3. 622. secM5. 



t. 4./. 7. Dill, in Raii Syn. 151. 

 Fine Feather Pondweed. Petiv. H. Brit. t. 6./. 6. 



In ditches and pools frequent. 



j8. In a ditch near Lodden bridge, not far from Reading. J. Bo- 

 hart. 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 bracteas under 

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



The variety j3, with one large simple obovate leaf under each 

 whorl oijlowers, ifMorison's plate be correct, is very remarkable. 

 It has not fallen in my way. 



2. M. verticillatum. Whoried Water-Milfoil. 

 Flowers all axillary. 



M. verticillatum. Linn. Sp. P/. 1410. Willd.v.4.407. Fl.Br.]022. 



Engl. Bot.v.4.t.2\8. 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 nodos. Dill. 



Giss. 112. append, \26.t. 7. RaiiSyn.3\6. 

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



