CLASS XXIL ORDER H. 12ir 



roundish, 2 or 4-valved opening elastically; they 

 are placed under separate scales in a spike, or 

 sometimes in the axils of leaves. (Very leafy, 

 their stems being generally covered with 2, 3 or 4 

 rows of narrow simple entire leaves.) 55. 5 — com- 

 filanatuvi^ (club-moss, or ground pine) leaves acute 

 2-rowed united, spikes in pairs or in fours pedun- 

 cled erect, stem creeping — obscurum, leaves scat- 

 tered 6-rowed, shoots erect, branches radiately 

 forked, spikes nearly sessile cylindric solitary ter- 

 minal — rufiestre, leaves scattered ending in a fila- 

 ment, spikes 4-sided sessile. 



EquisETUM. Fruit placed under peltate bodies, 

 which are arranged in whorls forming a spike-form 

 raceme ; four spiral filaments surround the seed 

 (probably) which resemble green globules. (Fer- 

 tile plants mostly leafless, the stems of all are 

 jointed with toothed sheaths at every joint, and 

 usually longitudinally striated and hollow.) 55. 5— - 

 hyemale, (scouring rUsh) stem naked very rough, 

 sometimes branched at the base, spike terminal— 

 arvenaCf (field horsetail) fertile stem simple naked, 

 sheaths broad sharp black distinct — sylvaticum^ 

 (woods horsetail) fertile stem with a few whorls of 

 branches, teeth at the joints broad -pointed. 



Order II. Musci.f 

 A. Ca/istiles wU/iouf a lid. 

 pHASCTJM. Capsule furnished with calyptre, but 



f So far the most common species of each genus have 

 been given. Perceiving that the \rork is swelling beyond 

 what was intended ; nothing more will be given under the 

 five remaining orders, than is absolutely necessary for stu- 

 dying the genera. Perhaps another edition may appear, 

 which will include all the known species of plants in the 

 Northern States. The manuscript was prepared last sum- 

 mer, under the immediate inspection of Professor Ives of 

 Yale College; and it is now ascertained, that it would not- 

 extend this book beyond another hundred pages. 



