. Introduction to structural and systematic botany, and vegetable physiology. Botany. EXOGENOUS OR DICOTYLEDONOUS PLANTS. 449 (Fig. 408), or very rarely antheriferous, or often only two, one pair being either suppressed or reduced to sterile filaments. Ovary free, two-celled, with the placentiB united in the axis. Capsule two- valved. Seeds indefinite, or sometimes few, albuminous. Embryo small. — Ex. Scrophularia, Verbascum (Mullein, which is remarkable for the almost regular corolla, and the five often nearly perfect sta- mens), Linaria, Antirrhinum (Snapdragon), &c. — The plants of this
. Introduction to structural and systematic botany, and vegetable physiology. Botany. EXOGENOUS OR DICOTYLEDONOUS PLANTS. 449 (Fig. 408), or very rarely antheriferous, or often only two, one pair being either suppressed or reduced to sterile filaments. Ovary free, two-celled, with the placentiB united in the axis. Capsule two- valved. Seeds indefinite, or sometimes few, albuminous. Embryo small. — Ex. Scrophularia, Verbascum (Mullein, which is remarkable for the almost regular corolla, and the five often nearly perfect sta- mens), Linaria, Antirrhinum (Snapdragon), &c. — The plants of this large and important order are generally to be suspected of delete- rious (bitter, acrid, or drastic) properties. The most important me- dicinal plant is the Foxglove (Digitalis purpurea), so remarkable for its power of lowering the pulse. Numerous species are cultivated for ornament. 874. Ord. TerbenaceBB ( Vervain Family). Ilerbs, shrubs, or often trees in the tropics, mostly with opposite leaves. Corolla bilabiate, or the four- or five-lobed limb more or less irregular. Stamens mostly four and didynamous, occasionally only two. Ovary free,. entire, two- to four-celled. Fruit drupaceous, baccate, or dry, and splitting into two to four indehiscent one-seeded portions. Seeds with little or no albumen. Embryo straight, inferior. — Ex. Verbena (Vervain) is the principal representative in cooler regions. There are many others in the tropics; one of which is the gigantic Indian Teak (Tectona grandis), remarkable for its veiy heavy and durable ri&. 979 and 980. Flower of a Verbena enlarged. 981. The corolla laid open. 982. Pistil. 983. The fruit. 984. Cross-section of the young fruit and the contained seeds. 985. Fruit separating into its four cocci. 986. Cross-section of one of the cocci, and a vertical section of the lower part, showing the surface of the contained seed. 987. Vertical section through the pericarp, seed, and embryo. 38*. Please note that these images are
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1850, booksubjectbotany
