340 CONIFERS. 



Rocky grounds. Subarct. Amer. to Maine. April, May. — A small tree, with 

 long spreading flexible branches. JSanJcs' Scrub Pine. 



4. P. variabilis Lamb : leaves elongated, in pairs and threes, channelled, 

 the sheaths long ; cones ovoid-conic, mostly sohtary ; spines of the scales 

 very slender, pointing outw^ard. P. mitis Mick. 



Forests. N. Eng. N. Y. 1 to Geor. May.— A tree 40—60 feet high, with a 

 pyramidal head. Leaves 3 — 5 inches long, dark-green. Cone solitary, 2 — 3 

 inches long. Timber fine grained and durable. Abundant in New Jersey. 



Yellow Fine. 



5. P. rigida Linn. : leaves in threes ; sheaths short ; sterile araenls 

 erect-incumbent ; cones ovoid, often in clusters ; spines of the scales rigid, 

 reflexed. 



Sandy soils. Maine to Virg. May. — A tree 30 — 50 feet high, with nume- 

 rous branches and a rough fissured bark. Leaves 4 — 6 inches long. Cones 

 usually clustered in threes or fours, 2 — 4 inches long. The wood abounds in 

 turpentine and is chiefly used as fuel. Pitch Pine. . 



6. P. serolina Mich. : leaves elongated, in threes ; sterile aments incum- 

 bent, nearly erect ; cones ovpid ; spines of the scales straight, slender. 



Margins of swamps. N. J. to Car. May. — A small tree. Leaves 6 — 8 inches 

 long. Cones larger and more globular than in the preceding. Pond Pine. 



7. P. Slrobus Linn. : leaves in fives, slender ; sheaths very short ; cones 

 cylindric-oblong, pendulous, much longer than the leaves; scales loose, 

 flattish, without spines. 



Fertile soils. Can. to Virg. May. — A very large and valuable tree, some- 

 times attaining the height of 200 feet or more. Leaves 4 inches long, sharply 

 triangular and more slender than in any of our species. Cone sohtary, very 

 long. Timber soft, fine grained and light. White or Weymouth Pine. 



** Leaves fasciculate, deciduous. Larix. 



8. P. pendula Ait. : leaves fasciculate, deciduous, short ; cones ovoid- 

 roundish, consisting of a few nearly orbicular thin scales ; bracts broad- 

 ovate, with the point attenuated, P. microcarpa Lamb. Larix Americana 

 Mich. 



Swamps. Can. N. Eng. and N. Y. N. to Arct. Amer. April, May. — A tree 

 from 30 — 7.0 feet high, which diflJirs from the preceding by its leaves growing 

 in tufts or fascicles, and in their being deciduous. Cones about half an inch 

 long, covered with soft scales. The wood is strong and durable. 



Hackmatack. Tamarack. 



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

 uated. Abies. 



9. P. BgZsaviea Linn. : leaves solitary, flat, emarginate or entire, glau- 

 cous beneath, somewhat pectinate at the Summit, nearly erect, below re- 

 curved-spreading ; cone cylindric, erect; bracts short, obovate, conspicu- 

 ously mucronate, somewhat serrulate. Abies balsamifera Mich. 



Mountains. Subarct. Amer. to Car. W. to the Rocky Mountains. May. — 

 A tree 40 — 50 feet high. Leaves 6 — 10 lines long. Cone solitary, erect. It 

 yields a kind of turpentine known by the name of Canada balsam, which is used 

 medicinally and for optical purposes. American Silver Fir. Balsam Fir. 



10. P. Fraseri Pursh. : leaves solitary, flat, short, emarginate, glau- 



