6 
SYNOPSIS. 
1. Equisetace<B, fructification in a catkin at the termination 
of frond. 
2. Filicace(B, fr. in clusters on the back of frond. 
3. OsmimdacecBy fr. in clusters at the apex of frond. 
4. OpMoglossacece, fr. on a separate branch of frond. 
5. Lycopodiacece^ fr. sessile, in the axils of leaves. 
6. Marsiliac€(B^ fr. seated on rhizoma. 
Order I. — EQUISETACEiE. 
Semi-aquatic plants, composed of tough fibrous roots, a joint- 
ed hollow cylindrical subterranean rhizoma, and erect jointed 
hollow cylindrical leafless stems, which are generally furnished 
at each joint with a whorl of jointed hollow angular leafless 
branches : the fructification is produced in terminal spikes or 
catkins, and these are either borne at the head of the usual stem 
or on separate earlier shorter stouter and more succulent stems, 
which decay immediately after the escape of the seed. Bota- 
nists are agreed in placing all the species of this order in the 
Genus Equisetum, Linfieus, the characters of which are con- 
sequently identical with those of the order. The British spe- 
cies are 
1. Eq. hyemale, fig. p. 17. Linneus, Species Plantarum, 
1517, and British authors. 
f2. Eq. Mackaii, fig. p. 25. Eq. h. var. Mackaii, Newman^ 
Phytologist, 305, date 1843. Eq. M. Babington, Manual, 
381. Eq. elongatuniy Hooker, British Flora, 451. 
f3. Eq. variegatum, fig. p. 31, var. Wilsoni, p. 39. Weber 8^ 
Mohr^ in Botanisches Taschenbuch for 1807, pp. 60 and 
447, and Brit. aut. 
1st pair 
2nd pair 
3rd pair 
Single... 
1 1 . Characeas. 
1 2. EquisetaceaB 
(3. Marsiliaceae 
(4. Lycopodiaceae 
li 
Circumferential. 
Ophioglossaeeae 
OsmundacesB 
.7. Filicaceae Central. 
f This mark indicates that the plant is introduced doubtfully as a species. 
