FERNS. 
83 
Equisetum.] 
Geo. — All Germany, Prussia, Holland, and Switzerland. From New York to 
Virginia, &c., and in North Asia. 
5. — EQUISETUM LIMOSUM. 
SMOOTH NAKED HORSE-TAIL. 
(Plate IX, fig. 5.) 
Ciia. — S tem erect, naked or branched, smooth. Sheaths short, 
appressed. Teeth numerous, short, acute and rigid. 
Syn. — Equisetum limosum, Linn., Willd., Smith, Hook., Bolt., Huds., Lightf, 
With., Mack., Gray. — Equisetum polymorphum, Sc hr. — Equisetum 
heleocharis, Elirh. 
Fig.— E. B. 929 .—Flo. Dan. 1184 .—Bolt. 38. 
Des. — Stem erect, quite smooth, striated with many slight 
furrows, but not channeled, generally naked, but sometimes putting 
out a few branches late in the season, which are smooth, simple, 
and ascending. Catkin terminal, broad and short, for the most 
part sessile in the upper sheath. Sheaths short, close pressed to 
the stem, with very numerous short brown teeth. 
Often confounded with Equisetum palustre, of which by some of the older 
botanists it was considered only a variety. It is, however, very distinct, and 
may easily be distinguished by not hearing branches till late in the season, after 
the catkin has decayed ; its branches also are less numerous, shorter, and either 
scattered over the plant or in irregular whorls ; it has shorter and more 
numerously-toothed sheaths, which are pressed close to the stem. The whole 
plant is smoother, and has shorter, thicker, and nearly sessile catkins. 
Sit. — In low sw'ampy ground, sides of streams, &c. 
Hab. — Not so common as Equisetum palustre, but pretty generally distributed. 
Moray and Ross-shire, Rev. G. Gordon. Tees, Mr. J. Hogg. Cheshire, Lanca- 
shire, and Cumberland, Mr. H. C. Watson. Wensley Dale, Yorkshire, Mr. J. 
Ward. Needwood Forest, Statfordshire, and Gamlingay Bogs, Cambridgeshire, 
River Severn, near Shewsbury, Hancott Pool, ditto, Mr. W. Leighton. Near 
Wrexham, Mr. J. E. Bowman. Warwickshire, Rev. W. Bree. Leicestershire, 
Rev. H. Bloxam. Derbyshire, Dr. Howitt. Norfolk, Miss Bell. Somerset, Mr. 
Southby. Sussex and South Kent, Rev. G. E. Smith. Near Bristol, Miss 
Worsley. Frequent in Ireland, Mr. Mackay. 
Geo. — Holland, Switzerland, and other parts of Europe. 
6.— EQUISETUM PALUSTRE. 
MARSH HORSE-TAIL. 
(Plate IX, fig. 6.) 
Cha. — Stem erect, naked or branched, rough. Sheaths long, 
loose. Teeth few and long. 
Syn. — Equisetum palustre of all English botanists . — Equisetum nodosum, 
Schr . — Equisetum ramosum, Schl. 
