168 



- 



fa 





"Leafless branched plants, with a striated fistular 

 joints sheathed above each joining. Sporules surrounded by 

 elastic clavate filaments, and enclosed in capsules arising from 

 the peltate scales of terminal cones or spikes. Yenation straight. 

 Cuticle abounding in silex. Only one genus." Bab. Man. p. 

 414. 



EQUZSETUIK. HOKSE-TAIL. 



1. E. ftuviatile (great Water Horse-tail.) In wet places 

 and by sides of rivers and pools, frequent. Sterile stems almost 

 smooth, with about 30 stria? and branches, which are simple and 

 nearly erect, from 3 to 6 feet high. Fertile stem unbranched, 

 stout, about a foot high, appearing before the sterile ones, hav- 

 ing numerous pale brown sheaths, and bearing a large spike. 

 (E. B. t. 2022.) E. Telmateia, Bab. Petit Tor. Watcombe. 

 Maidencombe. Shaldon. Cliffs at Dawlish. (Ilsington, Fl. D.) 

 P. iv. 



2. E. arvense (corn Horse-tail.) In damp meadows and 

 by roadsides, abundant. "Frond attenuated upwards, sterile 

 stem slightly scabrous, with 12 to 14 furrows, teeth of the sheath 

 lanceolate-subulate 1-ribbed to the point, branches simple erecto- 

 patent, fertile stem without branches, its sheaths remote loose " 

 (Brit. Flor. p. 598). The sterile and fertile stems are always 

 distinct, the latter appearing first. (E. B. t. 2020.) Ansti's 

 Cove lane. Teigmnouth road, etc. P. iv. 



3. E. limosum (smooth naked Horse-tail.) In watery places 

 and ditches. Sterile and fertile stems similar ; stems nearly 

 smooth, striate; striae about 16 or 18; branches nearly erect, sim- 

 ple, whorled. Stem from 2 to 4 feet high, spike blunt. (E. B. 

 t. 929.) Petit Tor, near St. Marychurch. P. vi. vn. 



4. E. palustre (marsh Horse-tail.) In wet and boggy 

 places, frequent. Sterile and fertile stems similar. " Stems 

 with 4 to 8 deep furrows, branched throughout ; sheaths loose, 

 pale, with acute wedge-shaped teeth, tipped with brown, and 

 membranous at the edges. Barren stem whip-shaped at the end. 

 Spike blunt. Sheaths coloured like the stem, or paler " (Bab. 

 Man. p. 416). Watcombe. Common in boggy places, FL D. 

 P. VI. VII. 



