LIST OF SEEDS, BULBS; TUBERS, ETC. 121] 
simple racemes; spikelets I—3' long, purplish or pale, 
erect; flowering glume lanceolate, acute or acuminate, 
glabrous or pubescent, fringed (5—12” long). River 
banks, Southern Virginia, Kentucky and southward, 
forming canebrakes. April. 
Variety suffruticosa, Munro.—Switch Cane, Small 
Cane :—Lower and more slender (2—10° high), often 
growing in water; leaves 4"—1' broad; spikelets soli- 
tary or in a simple raceme at the summit of the 
branches, or frequently on leafless radical culms. (A. 
tecta. Muhl.) Swamps and moist soil, Maryland, In- 
diana to Southeastern Missouri and southward. Some- 
times fruiting several years in succession. 
EQUISETACE: (Horsetail Family). 
EouisetumM—Horsetail, Scouring Rush. 
E. arveuse, L.—Common Horsetail:—Fertile stems 
(4—10' high) with loose and usually distant about 
eight to twelve toothed sheaths; the sterile slen- 
der (at length 1—2° high), ten to fourteen furrowed, 
producing long and simple or sparingly branched four- 
angular branches; their teeth four, herbaceous, lanceo- 
late. Moist, especially gravelly soil; very common. 
March, May. Rootstocks often bearing little tubers. 
E. prateuse, Ehrh.:—Sterile and finally also the fer- 
tile stems producing simple straight branches; sheaths 
of the stem with ovate-lanceolate short teeth, those of 
the branches three-toothed ; stems more slender and the 
branches shorter than in the last. Michigan to Minne- 
sota and northward. April, May. 
E. palustre, L.:—Stems (10—18 high) slender 
very deeply five to nine grooved, the ridges 
narrow and acute, roughish ; the lance awl-shaped teeth 
whitish margined; branches always hollow, four to 
