EQUISETACE/E. 
41 
I will now recapitulate, in the form of a list, the remarks coii” 
tained in the foregoing pages on the various unbranched forms 
of Equisetum which I have had occasion to mention. 
1. E. hyemale^ Linneus. Sheaths black, wdth a whitish band 
in the middle, terminating in a series of obtuse segments, and 
exhibiting, under a lens, traces of teeth, which appear to have 
been broken off : habit erect : habitat watery places in both 
continents. 
2. E. Mackaii^ Newman = E. elongatum. Hooker. Sheaths 
black throughout, terminating in long, aristate, somewhat flex- 
uous teeth : habit erect : habitat watery places in the north of 
Britain. 
3. E. ramosum, Schkuhr. Sheaths terminating in long, aris- 
tate teeth, concolorous with the internodes : habit erect : habi- 
tat watery places in Europe (and Wales ?) 
4. E. scirpoides, Michaux. Sheaths terminating in three 
setiform teeth : habit prostrate : plant very minute : habitat 
^mong moss, at the roots of trees, in North America. 
5. E. reptans^ a. Wahlenberg. Sheaths terminating in four 
setiform teeth : stem quadrangular : habit prostrate : plant very 
minute : habitat bare mountainous regions in Lapland. 
6. E. arenarium (apparently a MS. name, quoted by Weber 
and Mohr, and doubtless the E. variegatum of Smith). Sheaths 
having the upper portion only black, the lower concolorous with 
the internodes, terminating in obtuse segments, with white mar- 
ginal membranes, occasionally having their apices prolonged 
and setiform : habit prostrate : plant of various sizes ; habitat 
sands of the sea-shore, Barry, Southport, Bootle, New Brighton 
and Port Marnock. 
7. E. campanulatum, Poiret. This appears to differ from 
the preceding only in having the sheaths larger and looser : I 
have not seen it. 
8. E. variegatum^ Weber & Mohr. Sheaths as in No. 6 : 
habit erect, tall : habitat in the water, or on the wet banks of 
rivers, canals or ditches, Kincardineshire, Dublin. 
9. E. Wilsoni, Newman. Sheaths concolorous with the inter- 
nodes, except a black ring at the summit : teeth short, obtuse : 
stem smooth : habit erect, tall, stout : grows in water at Mucmss. 
