340 DICOTYLEDONOUS PLANTS. 



9. P. microcarpa lamb. : leaves fasciculate, deciduous ; strobile 

 roundish, few-flowered ; scales reflexed ; bracts elliptic, obtusely acu- 

 minate. P. pendula Wtild. Larix americana JW/VA. 



HAB. Mountains. N. S. N. to Subarc. Amer. May. *>. A 

 large tree, resembling the preceding, but according to Pursh and 

 Lambert, specifically distinct. Red Lurch. 



*** Leaves solitary, distinct at base. Scales of the cone even and attenu- 

 ated. ABIES. 



10. P. balsamea Linn. : leaves solitary, flat, emarginate or entire, 

 glaucous beneath, somewhst pectinate at the summit, nearly erect, be- 

 low recurved-spreading ; strobile cylindrical, erect ; bracts short, obo- 

 vate, conspicuously mucronate, somewhat serrulate. Abies balsamifera 

 Mich. 



HAB. Mountains. N. S. N. to Subarc. Amer. May. >>. A 

 tree 40 50 feet high. Leaves 6 10 lines long. Cone solita- 

 ry, erect. American Silver Fir. Balsam Fir. 



11. P.fraseri Pursh : leaves solitary, flat, shorter, emarginate, glau- 

 cous" beneath, subsecund, erect above ; strobile ovate-oblong, erect ; 

 bracts elongated, reflexed, bblong-cuneate, emarginate, shortly mucro- 

 nate, incisely toothed. P. balsamea var./raseri Nutt. 



HAB. Broad Mountains. Penn. Pursh. May. f>. Resembles 

 the former, but differs in being a smaller tree, the leaves shorter 

 and more erect, and the cones not one-fourth the size. 



Double Balsam Fir. 



12. P. canadcnsls Linn. : leaves solitary, flat, denticulate, somewhat 

 distichous ; strobile ovate, terminal, scarcely longer than the leaves. 

 -"Abies canadensis Mich. 



HAB. Mountains. Can. to Car. May. *>. A tree sometimes 

 attaining a very large size. Leaves 68 lines long. Cones very 

 small. -Bark contains a great quantity of tannin. 



lltmlnck 



13. P. nigra Alt. : leaves solitary, 4-sided, every where scattered, 

 erect, straight; strobile ovate ; scales elliptical, undulate on the mar- 

 gin, erosely denticulate at the apex. A. nirn Mii-li.f. 



HAB. Swamps. Subarc. Amer. to Car. May. *>. A large 

 tree, usually having a pyramidal summit. Leaves half an inch 

 long, dark green. Cones oval, 1 2 inches long. Black &jtnn / . 



14. P. rubra Lamb. : leaves solitary, subulate ; strobile oblong, ob- 

 tuse ; scales rounded, somewhat 2-lobed, entire on the margin. 



HAB. Hudson's Bay. Pursh. Maine. Torr. May. ^>. 



Red Sprwe. 



15. P. alba Ait. : leaves solitary, 4-sided, incurved ; strobile subcy- 

 lindrical, loose ; scales obovate, very entire. 



HAB. Swamps. Subarc. Amer. to Car. May. *?. A small 

 tree. Leaves 5 8 lines long, less crowded than in the preced- 

 ing. Cones slender, 2 inches long. White Spruce* 



