. The families of flowering plants. Plants; Phanerogams. 144 FAMILIES OF FLOWEEING PLANTS Family Erythroxylaceae. Eedwood family. Contains two genera, Erythroxylon, with about 90 species, natives of South America and Africa, and Aneukyphus, with a single species, A. Africana, a shrub of Upper Guinea. The plants are all shrubs or trees with small flowers, having 5 sepals and petals, and 10 stamens, the latter monadelphous, as we noted those of the Leguminosae to be. The fruit is a drupe con- taining a single seed. The bark, as the name indicates, contains a red- dish coloring matter, from which
. The families of flowering plants. Plants; Phanerogams. 144 FAMILIES OF FLOWEEING PLANTS Family Erythroxylaceae. Eedwood family. Contains two genera, Erythroxylon, with about 90 species, natives of South America and Africa, and Aneukyphus, with a single species, A. Africana, a shrub of Upper Guinea. The plants are all shrubs or trees with small flowers, having 5 sepals and petals, and 10 stamens, the latter monadelphous, as we noted those of the Leguminosae to be. The fruit is a drupe con- taining a single seed. The bark, as the name indicates, contains a red- dish coloring matter, from which a dye is prepared. The most inter- esting of the Erythroxylons is undoubtedly E. Coca, which yields the famous drug known as cocaine (Fig. 125 no. 3). Family Zygophyllaceae. Caltrop or Bean-caper Family. Con- tains about 20 genera and 150 species, of wide distribution in warm and tropical regions. They are herbs, shrubs, or trees, with leaves mostly opposite and more or less divided. The flowers are perfect, with the parts chiefly in fives; ovary 4-12 celled, capsular or baccate in fruit. Several low herbs with pinnate leaves and yellow flowers, belonging to the re- lated genera Tribulus and Kallstroemia, are common in the southwest, as is also the interesting creosote bush {Govillea Mexicana). So strong is the odor of the resinous principle in this plant, that I have known herbarium specimens many years old to cause a violent attack of hay- fever in a person subject to that disease. The shrub thrives in the desert region of Arizona and New Mexico and Mexico, and is very ornamental when in full bloom, although valueless either as fuel or for forage (see Fig. 126). The genus Guiacum consists of trees noted for the remarkable hardness of their wood, and for the resin which they contain. G. officinale, which is highly ornamental in culti- vation, with its blue flowers and pinnate leaves, yields the heavy wood known as lignum-vitae. The leaves of G. sanctum are frequently used in
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