6 4 



PINACEAE. 



Vol. I 



so, the scales thick and woody, rhomboid, fitting closely together by their margins, each 

 marked with a triangular scar at its base. Seeds large, sharply triangular-pyramidal. [Name 

 Greek, referring to the yew-like leaves.] 



Three known species, the following of southeastern North America, one Mexican. Type 

 species : Taxodium distichum (L.) L. C. Rich. 



Leaves linear, 2-ranked, spreading. i. T. distichum. 



Leaves awl-shaped, closely appressed to the twigs. 2. T. ascendens. 



i. Taxodium distichum (L.) L. C. Rich. Bald Cypress. Fig. 150. 



Cupressus disticha L. Sp. PI. 1003. 1753. 



T. distichum L. C. Rich. Ann. Mus. Paris, 16 : 298. 1810. 



A large forest tree, attaining a maximum height 

 of about 150° and a trunk diameter of 14 , the old 

 bark flaky in thin strips. Leaves narrowly linear, 

 flat, thin, s"-io" long, i" or less wide, rather light 

 green, acute, those on some of the flowering branches 

 smaller, scale-like; cones globose or slightly longer 

 than thick, pendent at the ends of the branches, very 

 compact, about 1' in diameter; surfaces of the scales 

 irregularly rugose above the inversely triangular scar ; 

 seeds 4"-s" long. 



In swamps and along rivers, southern New Jersey to 

 Florida, west to Texas, north in the Mississippi Valley 

 region to southern Indiana, Missouri and Arkansas. 

 Wood soft, not strong, brown, very durable ; weight 

 per cubic foot 27 lbs. The roots develop upright conic 

 " knees " sometimes 4° high and 1 ° thick. Called also 

 White, Red, Black or Virginia Swamp-cypress ; Sabino- 

 tree. March-April. 



2. Taxodium ascendens Brongn. 

 Pond Cypress. Fig. 151. 



Cupressus disticha imbricaria Nutt. Gen. 2 : 

 224. 1818. 



Taxodium ascendens Brongn. Ann. Sci. Nat. 

 30: 182. 1833. 



Taxodium imbricarium Harper, Bull. Torr. 

 Club 20, : 383. 1902. 



A tree with maximum height of about 

 8o° and trunk diameter of about 3 above 

 the greatly enlarged base, tapering upward, 

 its thick fibrous bark deeply furrowed. 

 Leaves awl-shaped, closely appressed to the 

 slender twigs, 2"-s" long, long-pointed, 

 keeled above, concave beneath, the tips 

 somewhat spreading; cones similar to those 

 of T. distichum. 



In ponds and swamps, southern Virginia to 

 Florida and Alabama. Wood heavier and 

 stronger than that of the Bald cypress. 



7. THUJA L. Sp. PI. 1002. 1753. 

 Evergreen trees or shrubs with frond-like foliage, the leaves small or minute, scale-like, 

 appressed, imbricated, opposite, 4-ranked, those of the ultimate branchlets mostly obtuse, those 

 of some of the larger twigs acute or subulate. Aments monoecious, both kinds terminal, the 

 staminate globose ; anthers opposite, 2-4-celled, the sacs globose, 2-valved. Ovule-bearing 

 aments ovoid or oblong, small, their scales opposite, each bearing 2 (rarely 2-5) erect ovules. 

 Cones ovoid or oblong, mostly spreading or recurved, their scales 6-10, coriaceous, opposite, 

 not peltate, dry, spreading when mature. Seeds oblong, broadly or narrowly winged or wing- 

 less. [Name ancient] 



About 4 species, natives of North America and eastern Asia. Besides the following, another 

 occurs from Montana, Idaho and Oregon to Alaska. Type species : Thuja occidentalis L. 



