PliATE 62. 
EQTJISETUM limosum, Linn * 
Smooth Naked Horsetail. 
Equisetum (§ zEstivalia*) limosum; stems or fronds one and a half to two and 
even more than three feet high, nearly smooth, striated; striae about sixteen 
to eighteen; teeth of the sheaths short, rigid, distinct; branches nearly 
erect, simple, whorled, often abortive; catkin terminal upon the stem. 
Equisetum limosum. Linn. Sp. PI. p. 1517. WiUd. Sp. PI. v. 5. p. 4. Sm. 
Engl. Pot. t. 929. Bolt. Fil. p. 68. t. 38. Schk. Fil. t. 171. Vaucli. 
Monogr. p. 44. t. 8. Sm. Engl. FI. v. 4. p. 839. Duval-Jouve, in Bull. 
Soc. Bot. p. 516./. 5. Hook, and Am. Brit. FI. ed. 8. p. 600. Cosson 
and Germ. FI. Env. Par. p. 880. 
Equisetum fluviatile. FI. Dan. t. 1184. Newm. Brit. Ferns, p. 51. (It is the 
E. fluviatile, Linn., according to Fries, in Herb, nostr. and others .) 
Equisetum nudum lsevius nostras. Rail Syn.p. 131. t. 5./. 2 A, B. 
Hab. Wet marshy grounds, in ponds and ditches and sides of rivers, throughout 
Great Britain. 
This is next in point of size to Equisetum Telmateja, but very 
different in aspect and structure, and especially in the presence 
of catkins on stems that are similar to the barren ones, and in 
the fewer angles and teeth and fewer branches in whorls; and 
these latter are often short and imperfect or wanting. 
The species seems to be as frequent in the temperate and 
subarctic districts of Europe and of North America as in Britain. 
Some of my specimens from each country have, besides the ter¬ 
minal catkin, nearly all the upper whorls of branches terminated 
by small black spikes. Differences of opinion exist as to this 
plant being the fluviatile of Linnaeus. Hartmann, in his Anno- 
tationes on the Scandinavian Plants of the Linnaean Herbarium, 
assents to the two there being the same, but considers E. 
fluviatile the older name (“ primum hinc inscriptum ”). Eries’s 
44 L. fluviatile, Linn.!” in my herbarium is the larger and more 
branched form of our limosum , and his “ E. limosum , Linn.!” is 
merely a smaller form with fewer branches. I do not at all see 
* § iEstivalia, Al. Braun: “ Stems all of one kind and fertile, fully developed 
at the time of fructification, green, throwing out whorls of branches, which, how¬ 
ever, are not universal.” 
