. Flowers of the field. Botany. CATKIN-BEARING TRIBE 265 P. tremula (Aspen).—Smaller than the last ; leaves smaller, orbicular, toothed, not cottony beneath, borne on slender stems, and therefore agitated by the least breath of air ; suckers from the POPULUS (Poplar) P. nigra (Black Poplar). — A tall tree of pyramidal growth. Leaves rhomboid, serrated, not cottony beneath ; buds sticky ; no suckers from the root. Not indigenous, but common by streams and rivers. The Lombardy Poplar is not indigenous, having been introduced from the East. Suh-order II. —Sweet-Gale Tribe 3. Myric
. Flowers of the field. Botany. CATKIN-BEARING TRIBE 265 P. tremula (Aspen).—Smaller than the last ; leaves smaller, orbicular, toothed, not cottony beneath, borne on slender stems, and therefore agitated by the least breath of air ; suckers from the POPULUS (Poplar) P. nigra (Black Poplar). — A tall tree of pyramidal growth. Leaves rhomboid, serrated, not cottony beneath ; buds sticky ; no suckers from the root. Not indigenous, but common by streams and rivers. The Lombardy Poplar is not indigenous, having been introduced from the East. Suh-order II. —Sweet-Gale Tribe 3. Myrica (Sweet-Gale).—Stamens and pistils on difterent plants ; scales of the catkin concave ; stamens 4-8 ; stigmas 2 ; fruit drupe- like, i-seeded. (Name, the Greek name ot the Tamarisk.) The only British species is M. Gale (Sweet-Gale).—A low shrub, about 3 feet high, which has a sweet resinous smell when bruised. Leaves ovate-lanceolate, toothed towards the upper end. The catkins appear before the leaves in the spring. Found in bogs in Scotland and the north of England, and occasionally in the south. Siib-order III. Betuline^..—Birch Group 4. Betula (Birch).—Stamens and pistils in separate flowers (monoecious) ; scales of the barren catkins in threes ; stamens 10-13 ; scales of the fertile catkin 3-Iobed, ^-flowered ; stigmas 2 ; fruit flattened, i-seeded, winged. (Name, the Latin name of the tree.) There are two British species, viz.— B. alba (Common, White, or Silver Birch).—A very graceful tree, with silvery-white bark, which peels= from the trunk in a curious manner. The branches are slender and somewhat pendu- lous, and the leaves, borne on long stalks, are broadly ovate, pointed, and serrate. A common forest Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Johns, C. A. (Charles Al
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1908
