latej 



; the 



ynot 



Equisetum.'] cxiii. equisetace^. 597 



^3.) I 1. Equisetum Linn. Horse-tail. (Tab. XIL f. 4.) 



Character of the Genus the same as that of the Order. 



Named from equus, a horse, and seta^ a hair^ or hi^istle ; whence 

 the Enoflish name horse-tail. 



^^tlie * Fertile stems unhranched, succule7it, appearing before the sterile ones, 



which have whorled branches^ \ 



*■ 



1. IL. fluvidtile L. (In part) Sm. {great Water H.); sterile 

 J] , stems with very numerous (about 30) striae and nearly erect 



^ simple branches, stem cylindrical smoothish, sheaths with close 



^^" small subulate teeth, fertile stems (short) without branches 



^^"^' clothed with ample loose sheaths having many subulate 2- 



ribbed teeth. E, B. t. 2022. E. Telmateja Ehrh, 



P% Muddy lakes, sides of rivers and pools, frequent. Fr. April. — 



^'S, The largest of all our species, its sterile stems or fronds being 3 — -4 



feet high. — We trust the name fluviatile may be preserved to this 

 i(J_ plant on the following grounds: — It is clear that under that appel- 



.ealed lation Linnaeus intended to include the present fine species, for he ex- 



n(jg2 pressly quotes — "Equisetum caule non sulcato latissimo, verticillis 



densissimis," of Haller ; and " E. palustre, longiorlbus setis," of 

 Bauhin; both quoted by Ebrhart himself under his F. Telmateja: 



we are, therefore, justified in saying this is Linnajus's E, fluviatile 

 "in part." Allowing, therefore, that his Swiss and Lapland speci- 

 mens are not identical with our fluviatile ; yet, seeing that they 

 are the same as £. Umosum^ a name equally given by the illustrious 

 Swede and, as we believe, universally adopted, we cannot conceive 

 'M\ I a rational objection to preserving it for the present plant. 



irane ^ ^ n t -, 



itary 2. E. umbrdsum Willd. (blunt-topped H.); frond very obtuse 



Ijits at the extremity, sterile stem especially upwards scabrous with 



prominent points and about 20 stri^, teeth of the sheath ap- 

 pressed, branches simple, slender, patent, fertile stem without 

 branches, its sheaths approximate appressed with subulate 1- 



over- ribbed teeth, the rib disappearing below the point. C. Drum- 



eons, mondi Hook Br. FL ed. L: and in E. B. S. t. 2777, 



I the 



Scotland, rare ; near Forfar, and banks of the Isla and Esk, in For- 

 farshire, extending up the valleys to their sources ; by the Caledonian 

 Canal; Campsie Glen ; Bonnington woods, Lanarkshire; Woodcock 

 Dale, Linlithgowshire; Falls of Moness. Near Belfast.^ Fr. April. 

 — Allied to the following species, but unquestionably distinct. Its 

 , i\ colour is greener and less glaucous; its stems rougher, with closely 



• '' I set raised points ; its angles and branches much more numerous, and 



-g I the whole barren frond is singularly blunt (in its outline) at the ex- 



'^y I tremity, by which it may at once be known from E. arvense. The 



^ I sheaths, though paler at the base, have blacker and more prominent 



r^^^ ribs upwards, and they are so close as to imbricate each other: their 



ei' I teeth also are more numerous, when they separate into the proper. 



number. In general appearance the sterile plant resembles E, st/lva* 



