84 Braun and Engelmann’s North American Equiseta. 
(Fremont, ) and the North West coast, (Chamisso.) (6. Germa- 
Missouri, in dry pastures, road sides. 9. Very rare, in Germany. 
E. esurneum, Schreb.—Sterile stems very smooth, ivory 
white ; sheaths consisting of about thirty bicarinate leaves, sepa- 
rated by deep commissural furrows ; caring of the simple branch- 
es again deeply furrowed, scabrous; their sheaths consisting of 
four (sometimes five) bicarinate leaves, with herbaceous erect 
subulate fragile teeth. Fertile stems simple, sheaths consisting 
GiBreriton 
Ne tit, 
E. Telmateja, Ehrh. £. fluviatile, Smith, Willd., Vaucher, not 
Hofim. #. decumanum, Pallas, (Siberia,) E. macrostachyon, 
Poir. (Barbary. ) 
6. rronpescens. Fertile stems persistent, producing herbace- 
_ ous branchlets. 
ederim 
‘tion. 
Erie and Superior, Torrey, according to Beck’s Botany. ) 
The sheaths of the fertile and sterile stems are formed by from 
20 to 40 leaves, generally 24 to 36. ‘Sterile stems from 2 to 5 
feet high. __ 
tt Meta bola, rages Epeidelay aos stems persistent and producing 
herbaceous branches after fructificatio 
3. E. syzvaricum, Linn. “Stel {and finally also the fer- 
stems ro pred, fertile on fey smooth ; earine of the sterile 
s scabrous, in’two rows ; sheat ths. consi ting of about twelve 
Tcavinate leaves with, Baio) ‘commissural furrows between 
them ; their scarious elon ted points partly connate, so that the 
y cabeisths appear to be 3- or Llobed ; carine of the branches slight- 
~ ly furrowed, somewhat scabrous; carine of the branchlets com- 
pressed, smooth, their sheaths funnel-shaped, consisting of 4 or 5 
_ (on the branches) and 3 (on the branches) Learinate leaves” 
= lanceolate-acuminate divergent teeth. 
_ Hab. Europe, Asia, North America, from Labrador (Unger) 4 
to Massachusetts, ( Oakes,) Pennsylvania, (Muhlenberg) Vagios 
, da, ( Pursh,) and Ohio, ( Riehl.) 
\ The sheaths of the stem are formed by 8 to 17 (aeesicetly 10 
to 14) parte whose points are connected in 2 to sais or more lobes, 4 
sieberiana 
5 
yt 
g 
como 
a -sahcniiess eae 
’ ny, Kentucky, (Short,) Missouri, in fertile woods. 7. Germany, 4 
of obsoletely 3-carinate leaves, with lanceolate subulate teeth.— 
y. sERoTINUM. ‘The usually sterile stems with late fructifica- : 
Hab. Europe, Asia, North Africa and North America, (on Lakes ; 
TESS RE ee Re ee eee RAP RS See 
tile ) stems doubly Branched, the branchlets curved downwards ; — 
a 
ETN eae eee mee 
: 
