518 MONOECIA MONADELPIIIA 



§ 1. Scales of the cone even, thin at summit, and rounded. 

 ■}* Leaves solitary, distinct at base. 



1. P. canadensis, ./,. Loaves somewhat distichous, flat, minutely 

 denticulate; cones elliptic-ovoid, terminal, small. Beck, Jiot. p. 340. 

 Pinus-Abies amcricana. Marsh. Arbuat. p. 103. 



Abies canadensis. JMx. Am. 2. p. 206, JWx* f Sylva, 3. //. 185 

 (Icon, tab. 13.). Undl. Ency. p. 804. 



Canadian' Pinus. Vulgo — Spruce Pine. Hemlock Spruce. 



Stem 20 lo 50 feet high, and 1 to 2 feci in diameter, with numerous horizontal, 

 and often rather depending, branches. Leaves sempervireni, half an inch tu 3 

 quarters in length, and about half a line wide, linear-oblong, obtuse, minutely 

 denticulate near the apex, smooth, shining i^rv.cn above, bluish izlaucous beneath, 

 especially while young, subsessile, or contracted at base to a very short petiole, 

 distichously arranged on the branches, and crowded at their extremities. Sta?n- 

 inate Jloicers in small roundish-ovoid pedunculate aments, which are racemosely 

 arranged around and near the ends of the slender branches. Cuius terminal, 

 somewhat pendulous, about an inch long, and 2 thirds of an inch in diameter, 

 oval, or elliptic-ovoid,— when young bluish-glaucous, finally pale brown, or ferru- 

 ginous; the svules imbricated, obovate, concave, with the apex rounded, thin, and 

 entire. 



Hub. Rocky hills ; Brandy wine, Schuylkill : not common. Fl. May. Fr. Aug-Sept. 

 Obs. All the Pines are rather scarce, in Chester County. This one is found in 

 several places on the rocky banks of our larger streams. The wood, though often 

 used for joists, «fcc. in building houses, is not durable when exposed. The bark is 

 said to be useful in tanning; and Marshall informs us the Aborigines used it to 

 dye their splints, for baskets, of a red color. The Pines of this section seem to 

 me to be very nearly, if not quite, distinct enough, in their habit and character, to 

 warrant the preservation of the genus Abies. 



§ 2. Scales of the cone thickened (it summit, and mostly acuminate. 

 -f Leaves aggregated, mostly sheathed at base : * in pairs. 



2. P. iNors, Ait. Leaves mostly in pairs, rather short ; cones oblong- 

 ovoid, somewhat incurved ; spines of the scales subulate, straight. 

 Beck, Bot. p. 338. Icon, JMx. f. Sylva, 3. tab. 4. 



P. virginiana. JWarsh. Arbust. p. 102. 



Poor, or destitute Pinus. Vulgo— Scrubby Pine. Jersey Pine. 



Stem 15 to 30 or 40 feet high, and 6 to 12 or 15 inches in d ameter, with numerous 

 straggling branches. Leaves an inch and half to near 3 inches long, very narrow 

 and linear, acute, smooth, scabrou3 on the margin, mostly in pairs (sometimes in 

 threes), and bound together at base with a sheath. Staminate Jlmcers in oblong- 

 ovoid sessile violet purple aments, which are clustered round the branches near 

 their extremities. Cones 2 or 3 inches long, ovoid, tapering, and often somewhat 

 curved ; scales oblong, thickened at summit, with a straight subulate acumination. 



Hab. Sterile hills : not common. Fl. May. Fr. September. 



Obs. This occurs on our sterile hills, South of the Great Valley, and also in 

 Kennett ,— in which places it was collected by D. Townsbnd, Esq. and Mr. Joshua 

 Hoopbs. 







