Inhaltsangabe
This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1909. Not illustrated. Excerpt: ... classification and description of the species. series iii. spermatophyta. seed-plants. Subkingdom, gymnospermae. Gymnosperms. Class, Glnkgoeae. Order, G1nkgoales. Ginkgoaceae. Ginkgo Family. i. Ginkgo Kaempf. Ginkgo. Trees with deciduous, fan-shaped, dichotomously veined leaves on wart-like dwarf branches. Ginkgo biloba. L. Maiden-hair-tree. A large, beautiful and hardy tree with dioecious flowers. Seed large, drupelike. Autumn leaves orange. Introduced from China and Japan; should be commonly cultivated for ornament. Class, Con1ferae. Conifers. Order, P1nales. Pinaceae. Pine Family. 2. Pinus L. Pine. Resinous evergreen trees with small dwarf branches bearing 2-5 narrow foliage leaves; dwarf branches and ordinary twigs covered with scale leaves. Dwarf branches self-pruned after a number of years. Carpellate cones woody, with numerous carpels. Our most important lumber trees. 1. Dwarf branches with 5 foliage leaves; ovuliferous scales little thickened at the tip. P. strobus. 1. Dwarf branches with 2-3 foliage leaves; ovuliferous scales much thickened at the tip. 2. 2. Dwarf branches with 3 foliage leaves, rarely 2 or 4. 3. 2. Dwarf branches mostly with 2 foliage leaves some of them may be with 3. 4. 3. Leaves fi-10 in. long; carpellate cone oblong-conic. P. taeda. 3. Leaves 3-5 in. long; carpellate cones ovoid. P. rigida. 4. Twigs glaucous; resin-ducts parenchymatous; carpellate cones 1J-3 in. long; ovuliferous scales tipped with a prickle or small spine. 5. 4. Twigs not glaucous. 6. 5. Leaves slender, 2J-5 in. long; buds not very resinous; prickles of the ovuliferous scales short and small. P. echinata. 5. ...
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