Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . nate to the calyx, andcrowned by its minute or obsolete limb, two- to six-celled with oneor two pendulous ovules in each cell: but the fruit is a one-celledand one-seeded nut (Fig. 576). Seed without albumen. Embryowith thick and fleshy cotyledons, which are sometimes coalescent. —Ex. Quercus (the Oak), Fagus (the Beech), Corylus (the Hazel-nut), Castanea (the Chestnut), &c. Some of the principal forest-trees in norther
Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . nate to the calyx, andcrowned by its minute or obsolete limb, two- to six-celled with oneor two pendulous ovules in each cell: but the fruit is a one-celledand one-seeded nut (Fig. 576). Seed without albumen. Embryowith thick and fleshy cotyledons, which are sometimes coalescent. —Ex. Quercus (the Oak), Fagus (the Beech), Corylus (the Hazel-nut), Castanea (the Chestnut), &c. Some of the principal forest-trees in northern temperate regions. The valuable timber andedible nuts they furnish are too well known to need astringent bark and leaves of the Oak abound in tannin, gallicacid, and a bitter extractive called Quercine ; they are used in tan-ning and dyeing. Quercitron is obtained from the Quercus tine- EXOGENOUS OR DICOTYLEDONOUS PLANTS. 477 toria. Galls are swellings on the leafstalks, &c., when wounded hycertain insects ; those of commerce are derived from Q. infectoria ofAsia Minor. Cork is the exterior corky layer of the bark of theSpanish Quercus 919. Ord. Myricacece (Sweet-Gale Family). Shrubs, with alter-nate and simple aromatic resinous-dotted leaves, monoecious or dioe-cious. Differs from the next principally by the one-celled ovary,with a single erect orthotropous ovule, and a drupe-like nut. — , Comptonia, the Sweet Fern. The drupes of M. cerifera(our Candleberry or Bayberry) yield a natural wax. 920. Old. BetlllaceSB (Birch Family). Trees or shrubs, with al-ternate and simple straight-veined leaves, and deciduous monoecious ; those of both kinds in aments (Fig. 312), andcommonly achlamydeous, placed three together in the axil of eachthree-lobed bract. Stamens definite. Ovary two-celled, each cellwith one suspended ovule: styles or stigmas distinct. Fruit mem-branaceous or samara-like, one-celled and one-seeded, forming withthe
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1860, booksubjectbotany
