. Leaves and flowers : or, Object lessons in botany with a flora : prepared for beginners in academies and public schools . Botany. 280 THE FLORA. c Involucre a closed, inflated sac, one-flowered, many together in the pendu- lous, hop-like cluster. Small trees, with very compact, strong timber, called Hop Hnrvbeam. JroTh-wood. Lever-wood. 0?'trta, c Involucre an open, 3-lobed leaf, 1-flowered, Small trees, with a, strong, heavy timber. Hornbeam. Cakpi'nus. Order CXX. BETULACEJE. The Birchworts. Trees or shrubs, witli deciduous stipules, with the alternate leaves simple, having the veinlets run
. Leaves and flowers : or, Object lessons in botany with a flora : prepared for beginners in academies and public schools . Botany. 280 THE FLORA. c Involucre a closed, inflated sac, one-flowered, many together in the pendu- lous, hop-like cluster. Small trees, with very compact, strong timber, called Hop Hnrvbeam. JroTh-wood. Lever-wood. 0?'trta, c Involucre an open, 3-lobed leaf, 1-flowered, Small trees, with a, strong, heavy timber. Hornbeam. Cakpi'nus. Order CXX. BETULACEJE. The Birchworts. Trees or shrubs, witli deciduous stipules, with the alternate leaves simple, having the veinlets running straight to the margin; flowers monoecious, both kinds contained in scaly catkins, 2 or 8 under each bract; calyx and corolla hardly any; ovary 2-eelled and 2-ovuled, but becoming iu fruit a 1-celled and 1-seeded nut, by the suppression of the other seed and cell. Analysis of the Genera, i bracts with 12 stam. each ; 9 bracts with mostly 8 ovaries. Birch. Bet'itla. 1 f bracts with 4^8 stam. each; ? bracts with 2 ova. or fls. each. Alder. Alnds. BET'ULA. Birch. 4 in a cylindrical cat- kin, bracts each with 3 tetrandrous flowers be- neath it. S in an oblong or egg - shaped catkin, bracts 3 lobed, each with 3 2-styled ova- ries or flowers, with no calyx. Samara flattened, broadly winged. — Trees and shrubs, mostly with the outer bark in thin layers with horizontal fibres. Catkins ap- pearing in early spring before the leaves. § Trees with a yellowish bark, and heart-ovate, serrate leaves,.. .1 i Trees with reddish-brown bark, and ovate, doubly serrate .2, 3 § Trees with white bark and long-stalked, long- pointed leaves 4, 5 § Shrubs with brownish bark, and roundish, crenate 6, 7. Fig. 633. S\pcet Black Birch {Betidn lenta\ with staminate and pistillate catkins: a, a scale with stamiriat© flowers; 6, with pistillate flowers. Fig. 683. a, A winged samara cut length- wise, showing its fertile and abortiva coil; h, the sutne cut aci' Please note th
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectbotany, bookyear1869
