PI. end. cr. 
4. EQUISET. 22. Equisctum. 25 
Earn. IV. 4. EQUISETACEiE. Richard. Peltatce, 
Hoffman ; Filicum pars , Linnaeus, Jus- 
sieu ; Peltigeree, Batsch ; Gonostendes , 
Willdenow. 
Fructification terminal, in the peltate scales of an ament; 
involucra bivalve ; seeds P numerous, naked, with four very 
hygrometrical threads twisting and untwisting round them. 
— Plant leafless ; branches verticillate, furrowed, jointed ; 
joints girt with a one-leaf sheath. 
22. EQUISETUM. Plinii H. N. 26, 13. Horsetail. 
Character , same as that of the order; there being no 
other genus. — Herb strongly astringent. 
1. Equisetum hyemale. Winter horsetail. 
Stem naked, erect, very rough, base rather branchy; 
spike terminal ; sheaths white, with a black base and tip; 
teeth bearded, all falling off, 
Equisetum nudum, Rail Syn . 131,11 ; Ger. em. 1113. 
E.junceum seu nudum, Park. 1201. 
Equisetum hyemale, Lin. S. P. 1517. 
Naked horsetail. Rough horsetail. Shavegrass. Dutch rushes . 
In marshes and moist woods; perennial; July and August. 
Stem half a yard high, sea-green, very rough ; sheaths 
short; amentum ovate, black. 
Used for polishing wood and brass; the epidermis 
abounding in silica. 
0. paucifolium. Leaves few. 
y. ramosum. Lateral branches numerous. 
2. Equisetum variegatum. Variegated horsetail. 
Stem naked, branchy at the base, stiff, smooth ish ; spike 
terminal ; sheaths black, white at the tip ; teeth white, dia- 
phanous, cuspidate. 
E. nudum minus variegatum Basiliense, Rail Syn. 130,3. 
E. tenue, Hoppe. 
Equisetum variegatum, Willd. S. P. 
Banks of rivers; perennial; July. 
Stem 6 inches high, quite simple, erect, round, slender, 
stiff, streaked, smoothish. 
6 
