. A manual of botany. Botany. GYMNOSPERMiE 179 in all parts of the world ; but they abound most in temperate climates. There are about 250 species. Propertiei and Uses.—They possess very important proper- ties. Many supply valuable timber, and most of the species contain an oleo-resinous juice or turpentine, which is composed of a volatile oil and resin. Order 2. Taxaoe/e, the Yew Order.—Character.—Trees or shrubs, with continuous branches. Leaves usually narrow, rigid, and veinless; sometimes broad, with forked veins. Flowers unisexual, naked, bracteate. Male flowers several together, each wi
. A manual of botany. Botany. GYMNOSPERMiE 179 in all parts of the world ; but they abound most in temperate climates. There are about 250 species. Propertiei and Uses.—They possess very important proper- ties. Many supply valuable timber, and most of the species contain an oleo-resinous juice or turpentine, which is composed of a volatile oil and resin. Order 2. Taxaoe/e, the Yew Order.—Character.—Trees or shrubs, with continuous branches. Leaves usually narrow, rigid, and veinless; sometimes broad, with forked veins. Flowers unisexual, naked, bracteate. Male flowers several together, each with one or several stamens, which, in the latter case, are united or distinct; anthers bursting longitudinally. Female flowers solitary, and consisting of a single erect naked ovule, which is either terminal or placed in the axil of a bract. Seed small, usually more or less surrounded by a cup-shaped fleshy mass or aril, albiuninous; embryo straight. This order Fig. 933. Fig. 934. Fig, 93a. Male flower o£ the Common Yew (Taxns bac- cata), with numerous mo- nacTelphous stamens. Fig. 934. Vertical section of the seed of the same. ar. Tlie succulent cup-shaped ma=s which surromids the seed. pi. Embryo, alb. Al- bumen, ch. Chalaza. mu is noiv frequently incUidcd in the ConifercB, forming the tribe or sub-order Taxece or Tarinece. Distribution and Numbers.— Natives of the mountains of tropical countries, and of temperate regions. Illustrative Genera:—Taxus, Linn.; Salisburia, Smith. There are about 50 species. Properties and. Uses.—In their general properties they re- semble the Coniferse. Order 3. Gnetace^, the Jointed Fir Order.—Character. Small trees or shrubs, with usually jointed stems and branches. Leaves opposite, entire, net- or parallel-veined, or sometimes small and scale-like. Flowers unisexual or rarely hermaphro- dite, in catkins or heads. Male flowers with a 1-leaved cahjx ; anthers 2—3-ceUed, with porous dehiscence. Female flowers naked or
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
