. Foundations of botany. 2. P. Taeda, L. Loblolly Pine, Oldfield Pine. A largetree ; bark very thick and deeply f m-rowed, becoming flaky with age,twigs scaly. Leaves in threes, 6-10 in. long, slender, very flexible;sheaths §-1 in. long. Cones solitary, oblong-conical, 3-5 in. long;scales thickened at the apex, the transverse ridge very prominentand armed with a short, stout, straight, or recurved spine. Commonand often springing up in old fields ; trunk containing a large pro-portion of sap wood; timber of little value for outside work.*^ 3. P. rigida, Mill. Northern Pitch Pine. A stout tree,
. Foundations of botany. 2. P. Taeda, L. Loblolly Pine, Oldfield Pine. A largetree ; bark very thick and deeply f m-rowed, becoming flaky with age,twigs scaly. Leaves in threes, 6-10 in. long, slender, very flexible;sheaths §-1 in. long. Cones solitary, oblong-conical, 3-5 in. long;scales thickened at the apex, the transverse ridge very prominentand armed with a short, stout, straight, or recurved spine. Commonand often springing up in old fields ; trunk containing a large pro-portion of sap wood; timber of little value for outside work.*^ 3. P. rigida, Mill. Northern Pitch Pine. A stout tree,30-80 ft. high, with rough scaly bark. Leaves in threes, 3-5 , stiff and flattened. Cones ovoid-conical, 2-3 in. long, their 1 Descriptions followed by an asterisk are taken (more or less simplified) fromProfessor Tracys flora in the Southern States Edition. GYMNOSPERMS 15 scales tipped with a short, abruptly curved spine. Wood hard,coarse and resinous, mainly used for fuel. Poor, sandy soil,especially Fig. 1. —Scotch Pine (P. sylvestris). 1, a twig showing : a, staminate catkins ; b, pistillate catkins ; c, a cone ; d, , an anther, a, side view ; b, outer surface. 3, a carpel-scale, a, inner surface ;b, outer surface. 4, a cone-scale, a seed-wing, and a seed. 5, section of a seed,showing the embryo. (1) is natural size ; the other parts of the figure are magni-fied by the amount indicated by comparison with the vertical line alongside each. 4. P. inops, Ait. Scrub Pine. A small tree, usually 20-30 , but sometimes much taller; bark of the trunk rough, nearlyblack; twigs smooth and with a bloom. Leaves in twos, 1-2 in. 16 FOUNDATIONS OF BOTANY long, rigid, sheaths veivy short. Staminate catkins dull yellowish-puiple, 1 in. long. Cones solitary, short-peduncled, often reflexed,ellipsoid-conic, about 2 in. long ; scales thickened at the apex andarmed with a slender, straight, or recurved prickle. On dry, sandysoil; wood light, soft, weak, and o
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