LVcoHoni \CK.E. 455 eq^uisetum, 



2 E. auvk'nse. Field Horsetail. 



Fa-li f xleiiis erect, siinplf, stcrilr with simple, qnadrangulnr branches, de- 

 cumbent at base. Low giounds. Fertile stems fnst a p|)ea ring. (J — 8 inches 

 hijri), with :5 — 5 joints siirmnunled by large, inflated sheaths cut into hrnir, 

 dark brown leeili. Spike nblono-, ^—2 inches long. Stt'rile stems rather 

 taller than the fertile, remaininir ihronirh the season, after these have decayed. 

 At each joint is a whorl of snnple, rough, ascending branches, issuing i'rom 

 the base of the sheaths, their joints also sheathed. April. 



3. K. syi.va'ticum. Wi:od II irsr.tail. 



Sl.r.rilc iind ferlilK stems with conipound, rough, diflexed, angular branches. 

 Grows iti woods and low grounds. Stems!! — Hi inches high ; ihe fertile with 

 4 — 5 whorls of branches Irom the base of the sheaths which are 2— :i inches 

 opart, and cleft into .several large, tawny red teeth or segments ; the sterile 

 taller and more slender, with more numerous whorls of branches. The 

 branches are all subdivided and curved downwards. Spike oval cylindiic, 

 pedicellate. .May. 



4. E. v.\kieo.4'tum. Sw. E. seorpoides. Mx. 

 CiEspiti'.se ; .sVcw.f branching at base, filiform, scabrous; spike blackish; 



sliralhs :?-toothed, blackish, teeth meinbranaeeoiis. whitish, deciduous at the 

 tips, liilly woods. Stems numerous. 3 — (J inches long, (i-fiirrowed (.")-lur- 

 rowed. Bed:), sheaths very shoit, 1 — 2 inches a[iail. Spikes small, ovoid 

 terminal. July. 



5. E. LiMo'suM. L. Pipes. E. uliginosum. H^illd. 

 Sums somewhat branched, erect, striate-siilcate ; brnnclus from the middle 



joints, simple, short, 5-sided, smooth ; tpke obhmg-ovoid ; s.Wir. <//;>• a ppressed. 

 Borders of [nmds and swamps Slejns 2 — ?> feet high, slender, rarely simple, 

 generally wiih 2 — U whnrls about the middle, liranehes very irrejrular in 

 lenfftli aiid position. Sheaths :j — -1 lines long, white at Ihe summit, tipped with 

 as many !d;i k, subulate teeth as there are furrows (15 — 20). This species is 

 greedily devoured by cattle. July. 



G. v.. PAi.u'sTKF.. Marsh II rsclnd. 



•S.7;ms- biMnnhed, smooth, sul'viate; //r.7,nr//c5 simple, pentagonal, curved tip- 

 wards; sheitli siimewhat appressed, remote. lO-tootlied at tlie ape.x ; .'■pike 

 oblonir. dark brown. Marsiies. Stems 1 — 2 fi'et high, deeply kirrowed. 

 Branches short and like the other spt-cies produced in wlioils i'rom the bases 

 of Ihe sheaths, at first horizoniil, finally bending to an upright position. 

 Spike an inch long. May. June. 



ORDER CLXIII. [.YCOPODI.ACE/E. The Cluh Moss Tribe. 



Infloreacmce axillan', or crowded iiiio a ."sort of ameiit or spike. 

 Thecn: of two kiiul.<'iii the .«ame plant, se.<-ile, 1, ullfii 'i-celieit. 

 Sporea few, rather larse in same of the tlieca;, other theca; eoiitaining minute grains, ap- 



peariiio: like fine powrler. 

 Stems creepiiiproi erect, braiicliiiiir, rarely simple, abonndiii? in dnot.«. 

 Leaves small, luinienms, crowileil, ejilire, lanceolate or subulate, l-iierveil. 



liike the l!(|iii»etacen?, tliPseplanis appear to liave been very abundant in the first a^es of 

 the world, anil to have attained a sifjanlic size, though at present but a few feet in lenp-th. 

 Properlie.s an inmorlant. Some are emetic The powder contained in the ihccrc is hiylily 

 inflamable, and is used in the manufacture of fireworks. 



Genera. 



Loaves cnnline, on erect or creepin? stems. Lyrnpodium. \ 



Loaves or iVjikU laJical, long-, linear-subulate Isoetis. 2 



