. Introduction to structural and systematic botany, and vegetable physiology. Botany. 424 ILLUSTRATIONS OF THE NATURAL ORDERS. crop, Orpine, Live-for-ever), Crassula, Sempervivum (Houseleek), &c. They mostly grow in arid places, and are of no economical im- portance. 8iil. Ord. SElxifragacca) {Saxifrage Family). Herbs or shrubs, with alternate or opposite leaves. Calyx of four or five more or less united sepals, either free from or more or less adherent to the ovary, persistent. Petals as many as the sepals, rarely want- ing. Stamens as many, or commonly twice as many, as the pistils or se
. Introduction to structural and systematic botany, and vegetable physiology. Botany. 424 ILLUSTRATIONS OF THE NATURAL ORDERS. crop, Orpine, Live-for-ever), Crassula, Sempervivum (Houseleek), &c. They mostly grow in arid places, and are of no economical im- portance. 8iil. Ord. SElxifragacca) {Saxifrage Family). Herbs or shrubs, with alternate or opposite leaves. Calyx of four or five more or less united sepals, either free from or more or less adherent to the ovary, persistent. Petals as many as the sepals, rarely want- ing. Stamens as many, or commonly twice as many, as the pistils or sepals, or rarely indefinitely numerous, perigynous. Ovaries mostly two (sometimes three or four), usually united below and distinct above, sometimes completely united and even the styles also. Seeds numerous, with a straight embryo in fleshy albumen. The order, taken in the largest sense, includes four tribes, as they should probably be called, rather than suborders, which some botanists regard. even as distinct orders, viz.: The SaxifragejE, or true Saxifrage Family, which are herbs, with no manifest stipules, except the wings or appendages at the base of the petiole or radical leaves. Ex. Sax- FIG. 839. SulHvantia Ohionia. 840. Flower with the calyx laid open, Bomewhat enlarged. 841. Fruit surrounded by the persistent calyx and withered petals, enlarged. 842. Section of the lower part of the capsule, magnified ; showing the central placenta covered with the as- cending seeds. 843. A magnified seed, with its cellular, wing-like testa. 844. Section of the nucleus, showing the embryo in the midst of 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 Gray, Asa, 1810-1888. New York [etc. ] Ivison, Blakeman, Taylor & Co.
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