. A manual of botany. Botany. DICOTYLEDONES—MONOCHLAMYDE^ 253 Fig. 1011. with little or no albumen ; embryo straight; cotyledons folia- ceous; radicle superior. Division of the Order and Illustrative Genera.—This order may be divided into two sub-orders or tribes as follows :— Sub-order 1. Celtece.—Ovary 1-oelled, with drupaceous fruit. Illustrative Genera :—Celtis, Tourn.; Mertensia, H. B. K. Sub-order 2. TJlmece.—Ovary 2-celled, with usually samaroid fruit. Il- lustrative Genera :—Planera, Gmel.; Ulmus, Linn. Distribution and. Numbers.—They are chiefly natives of the northern regions of the
. A manual of botany. Botany. DICOTYLEDONES—MONOCHLAMYDE^ 253 Fig. 1011. with little or no albumen ; embryo straight; cotyledons folia- ceous; radicle superior. Division of the Order and Illustrative Genera.—This order may be divided into two sub-orders or tribes as follows :— Sub-order 1. Celtece.—Ovary 1-oelled, with drupaceous fruit. Illustrative Genera :—Celtis, Tourn.; Mertensia, H. B. K. Sub-order 2. TJlmece.—Ovary 2-celled, with usually samaroid fruit. Il- lustrative Genera :—Planera, Gmel.; Ulmus, Linn. Distribution and. Numbers.—They are chiefly natives of the northern regions of the world. There are about 60 species. Properties and Uses.—Some are valuable timber trees. The bark and fruit of others are bitter, tonic, and astringent; and a few possess aromatic properties. Order 37. Platanace^, the Plane Order.—Character. — Trees with a watery juice. Leaves alternate, pal- mately lobed, with deciduous sheathing stipules. Flowers unisexual, monoe- cious in globular amentaceous heads ; achlamydeous. Male flowers with 1 stamen and a two-celled linear anther. Female flowers consisting of a 1-celled ovary and a thick style ; ovules 1—2, pendulous. Fruits arranged in a com- pact rounded head, consisting of clavate achsenia with persistent styles, Seeds 1 or rarely 2, pendulous; embryo straight, in very thin albumen, with an inferior radicle. Distribution and Numbers.—They are natives principally of North Ame- rica and the Levant. Platanus, Linn., is the only genus, of which there are 5 or 6 species. Properties and Uses.—Of no particular importance, except that, from their being large handsome trees, and flourishing well in large towns, they are commonly planted in our parks and squares. The leaves closely resemble in appearance those of. Fig. 1011. Branch of the Place tree {Platanus orientoZis), with amentaceous heads of aclilamydeous female Please note that these images are extracted from scanned page images that may have been
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