360 MONOECIA.— MOiVADELPHIA. 



oblong-conical, as long as the leaves ; spines of 

 the scales subulate, straight. 

 HAB. Pine barrens. A middle sized tree; leav. 

 1 — 2 in. long; cones 2 in. long. 



7. P. resinosa : leaves elongate, by pairs, with long 



sheaths ; cones ovate-conical, rounded at the base, 

 mostly solitary, half as long as the leaves ; scales 

 dilated, unarmed. 

 HAB. Dry woods. A large tree; bark red, smooth; 

 cones large ; scales not mucronate. 



8. P. Banksiana : leaves short, by pairs, rigid, divari- 



cate, oblique ; cones recurved and twisted ; scales 

 unarmed. 

 HAB. Barren rocky places. A small straggling 

 tree ; leav. 1 — 2 in. long. 



9. P. variabilis : leaves slender, geminate and by 



threes, canaliculate ; cones mostly solitary, ovate- 

 conical ; scales with a subulate incurved point. 

 HAB. Woods. A large tree; leav. mostly by pairs, 

 4 — 5 in. long ; cones small. 



10. P. rigida : leaves by threes, with short sheaths ; 

 sterile aments erect-incumbent : cones ovate, 

 scattered or clustered ; spines of the scales re- 

 flexed. 



HAB. Barren sandy soils. A large tree ; bark thick 

 and rough; cones large. 



11. P. scrotina: leaves by threes, elongate; sterile, 

 aments erect, incumbent ; cones ovate ; spines of 

 the scales straight, very slender. 



HAB. Swamps. A large tree resembling the pre- 

 ceding. 



12. P. Slrobus : leaves by fives, slender ; sheaths very 

 short ; cones pendulous, cylindrical, longer than 

 the leaves ; scales loose. 



HAB. Fertile soil. A very large tree ; leav. very 

 delicate ; cones 3 in. long. 



*** Leaves fasciculate, [deciduous.) i.arix. 



13. P. microcarpa : cones roundish, few-flowered ; 

 scales inflexed ; bracts elliptic, obtusely acumi- 

 nate. 



HAB. Swamps and low grounds. A pretty large 

 tree f scales red, brown, or white. 



