2 PINACEAE 



B. Cone-scales with dorsal usually spine-armed appendages : leaves mostly in 

 2's or 3's. 

 Leaves 2 together in each sheath. 

 Appendages of the cone-scales with obsolete spines : bark smooth except 



when old. 2. P. resinosa. 



Appendages of the cone-scales with well-developed spines : bark rough 

 or furrowed 

 Cones 4-7 cm. long, slender, conic. 



I,eaf-sheaths over i cm. long. 3. P. echitiata. 



lyCaf-sheaths less than i cm. long. 4. P. Virginiana. 



Cones 10-13 <^iii- long : stout, ovoid. 5. P. ptingens. 



Leaves 3 together in each sheath. 



Cones narrow, conic, much longer than thick. 3. P. cchinala. 



Cones ovoid, globose or depressed when old. 



Upper cone-scales with incurved spines, the lower with recurved : base 



of cone rounded. 5. P. pungens. 



LTpper and lower cone-scales with straight spines : base of cone flat. 



6. P. rigida. 



1. Pinus Strobua L. White Pine. (Man. p. 31 ; I. V.f. no.) Often 

 forming dense forests, or scattered in rocky soil, Newf. to Man., Ga., Ind. 

 and la. — Pennsylvania : Chester ; Lancaster ; Blair ; Hunting- 

 don ; Montour ; Erie ; Tioga ; Delaware ; Luzerne ; York ; Al- 

 legheny. Common in the mountainous regions. 



2. Pinus resinosa Ait. Red Pine. (Man. p. 31 ; I. V.f. in.) In 

 woods, Newf to Man., Mass., Pa. and Minn. — Pennsylvania : Hunting- 

 don; Luzerne; Wayne. 



3. Pinus echinata Mill. Yellow Pine- (Man. p. 32; I. F./ 116.) 

 In sand}- soil, N. Y. to Kans., Fla. and T^s..— Pennsylvania : Lancas- 

 ter, Manheim ; Columbia, Berwick. 



4. Pinus Virginiana Mill. Jersey Pine. (Man. p. 32 ; I. F./. //J.) 

 In sandy soil, N. Y. to Ind., Ga. and Ala. — Pennsylvania: Northamp- 

 ton ; Lancaster ; Franklin ; York ; Allegheny. 



5. Pinus pungens Michx. f Table Mountain Pine. (Man. p. 32 ; 

 I. F.y. 117.) In rocky soil, N. J. to Pa., Ga. and Tenn. — Pennsylvania : 

 Blair ; Huntingdon ; Mifflin ; Franklin ; Lancaster ; Schuyl- 

 kill ; York. 



6. Pinus rigida Mill. Pitch Pine. (Man. p. 33 ; I. F./. iig.) In 

 dry sandy or rocky soil, N. B. to Ont., Ga. and Tenn. — Pennsylvania : 

 Northampton ; Bucks ; Chester ; Lancaster ; Monroe ; Hunting- 

 don ; Franklin ; Tioga ; Luzerne , Schuylkill ; Delaware ; York. 



2. PICEA Link. 



Leaves merely green : sterigmata pubescent. 1. P. Mariana. 



Leaves glaucous : sterigmata glabrous. 2. P. brevifolia. 



1. Picea Mariana (Mill.) B.S.P. Black Spruce. (Man. p. 34; I. 

 F.y. 122.) In rocky or stony soil, Newf. to the N. W. Terr., N. J. and 

 Minn., and in the mountains to N. C — Pennsylvania : Monroe ; Cen- 

 tre ; Cambria ; Lackawanna. 



