pijSte family 



15 



4. p. virginiana ]\Iill. Scrub Pine. A small tree, usually 20-30 ft. 

 high, but sometimes much taller; bark of the trunk i^ugh, nearly 

 black; twigs smooth and with a bloom. Leaves in "twos, 1-2 in. 



Fjg. 1. Scotch pine (Pinus syhe/>tris) 



1, a twig showing: a, stamiuate catkins; 6, pistillate catkins; c, a cone; d, 

 needles. 2, an anther: a, side view; b, outer surface. 3, a carpel scale: 

 a, inner surface ; 6, outer surface. 4, a a cone scale, 6 a seed wing, and 

 c a seed. 5, section of a seed, showing the embryo. 1 is natural size; 

 parts 2, 3, and 5 are magnified by the amount indicated by comparison 

 with the vertical line alongside each. (After Wossidlo) 



long, rigid, sheaths very short. Staminate catkins dull, yellowish- 

 purple, 1 in. long. Cones solitary, short-peduncled, often reflexed, 

 ellipsoid-conic, about 2 in. long; scales thickened at the apex and 



