MONOECIA— TRIANDRIA. Sparganium. 75 



2. S. simplex. Unbranched Upright Bur-reed. 



Leaves triangular at the base, with flat sides. Common 

 flower-stalk simple. Stigma linear. 



S. simplex, HudsAOX. Fl.Br. 962. Engl.Bot.v.l].t.745. Willd. 



Sp. PL V. 4. 199. Curt. Lond.fasc. 5. t. 67. Hook. Scot. 260. 



Dicks. H. Sice. fasc. 6. 7. 

 S. Buperaxillare. Ehrh. Calam. 129. 

 S. erectum (5. Linn. Sp. PL 1378. 



S. n. 345.* .Linn. FL Lapp. ed. 1. 271. ed. 2. 280. Herb. Linn. 

 S. n. 1303 15. HalL Hist. v. 2. 162. 

 S. non ramosum. Raii Sijn, 437. Bauh. Pin. 15. Theatr. 231./. 



Moris. V. 3. 245. sect. 8. t. 13./. 3. 

 S. alteram. Lob. Ic. 80./. Dalech. Hist 1019./. Bauh. HisLv. 2. 



.541./. 

 S. latifolium, Ger. Em. 45./. 

 Sparganium. Tillands. Ic. 15./. 



In pools and ditches, especially on a gravelly soil. 



Perennial. .July, August. 



Linnseus, Haller and Leers have considered this as a variety of the 

 preceding^ but Hudson, Curtis, Ehrhart and succeeding botanists 

 have well distinguished them. The present is a smaller plant. 

 The intermediate spaces, between the 3 angles, at the base of 

 each radical leaf, is flat, not concave, as Curtis, I believe, first 

 remarked. The stem is erect, perfectly simple, not branched or 

 panicled, the lowermost head oijlowers only being usually ele- 

 vated on a partial stalk. Calyx green, or not of so deep a brown 

 as in the former. Anthers rather yellower. Stigma long and li- 

 near, for the most part solitary. 



3. S. natans. Floating Bur-reed. 



Leaves floating, flat ; concave at the base. Common flower- 

 stalk simple. Stigma ovate, very short. Ball of barren 

 flowers mostly solitary. 



S. natans. Linn. Sp.PL\?,19,. Willd.v.4. 200. Fl Br. 962. Engl. 



Bat. V. 4. t. 273. Hook. Scot. 26U. FL Dan. t. 260. Dicks. H. 



Sice. fasc. 6. 8. Ehrh. Calam. 1 10. 

 S. simplex |3. Huds. 401. 

 S. n. 1304. Hall. Hist. v. 2. 163. 

 S. minimum. Raii Syn. 437. Bauh. Pin. 15 ? Prodr. 24 ? 



In muddy fens, or slow rivers. 



In the Norwich river. Mr. Rose. Ponds in Scotland. Dickson. 



Common in the lakes about Lochmaben, Dumfriesshire. Mr. J. 



Burgess, 1782. In Burwell fens, Cambridgeshire. Rev.Mr.Hem- 



sted. Near Manchester, Dr. Hull. 

 Perennial. July. 



