160 ACOTYLEDONS. EGLU18ETACE/E. EqUlSCtum 



1 



HAD. Highland mountains, frequent. 



Used in Raasay, near Skye, and some other places, instead of alum, 

 to fix the colours in dyeing. The Highlanders employ it, in infusion, 

 as an emetic and cathartic j but it operates violently, and, unles* 

 taken in a small dose; brings on giddiness and convulsions, Lighif. 



Linnaeus says, that the Swedes use v a decoction of it to destroy lice on 

 swine and other animals. 



ORDER IX. MARSILEACE^. Br. 



Fructifications radical. Involucrum subsphaerical, not opening, 

 coriaceous or membranaceous, one- or many-celled. Aquatics. 



1. ISOETES. 



Capsule membranaceous, not opening, immersed in the base of 

 the frond, one-celled. Seeds angular, inserted upon many fili- 

 form receptacles. 



l.l.lacustris, Light/. p.6S3. E.B.t.WSl. 



HAB. Bottoms of the Highland lakes, not uncommon. In Jura and 

 Skye, Light/. Loch Tay, Dr. Stuart. Loch of Clunie, Rev. Mr. 

 M* Ritchie. Loch Lomond, Mr. Murray. Loch Leven, Mr. Arnott. 

 Shallow parts of the Lake of Monteith, Mr. Young. 



Leaves all radical, 5 6 inches long, subulate, semicylindrical, flehy. 



2. PILULARIA. 

 Involucres imbricated, solitary, nearly sessile, globose, coriaceous, 



4-celled. Cells containing two different kinds of bodies, an- 

 thers? and capsules? 

 1. P. globulifora, Lighif. p. 683. E. B. t.$2l. Hook, in Ft. 



Lo?id. with a figure. 

 HAB. Damp places that are overflowed during the winter, but not 



common. Braid hill marshes, Pentland hills j Cuthel muir, &c. 



Mr. Arnott. Loch of Cluny, Rev. Mr. M' Ritchie. Loch Lomond, 



Mr. Murray. 

 Stems filiform, creeping. Leaves? 3 inches long aubulato-filiform, clu 



tered. Involucres as large as peas, brown, scaly at the base of the 



leaves. 



ORDER X. EQUISBTACE^E. 



Fructification terminal, spicate, consisting of peltate polygonous 

 scales,on the under side of which are from 4 7 involucres, which 

 open longitudinally, and contain numerous naked (?) seeds, en- 

 folded by four filaments bearing anthers (?) at their extremities. 



Vegetation: stems rigid, leafless, jointed, striated, the articulations 

 sheathed at the base, the branches vvhorled. 



1. EQUISETUM. 

 i. E. arvensc, sterile stems decumbent with simple branches, 



