. Botany for agricultural students . Botany. 492 ANGIOSPERMS weeds that are poisonous. The Horse Nettle (Solanum caro- linense) {Fig. JfA2) is troublesome on account of its spiny stems, and it has a deep rootstock, which is difficult to eradicate. Another troublesome weed of this family is the Buffalo Bur (Solanum rostratum) {Fig. 443), which has spiny fruits that catch into the wool and hair of livestock. The Madder Family {Rubiaceae). — This is one of the largest families of the Dicotyledons. There are more than 4000 species be- longing to this family, but the majority of them are tropical.
. Botany for agricultural students . Botany. 492 ANGIOSPERMS weeds that are poisonous. The Horse Nettle (Solanum caro- linense) {Fig. JfA2) is troublesome on account of its spiny stems, and it has a deep rootstock, which is difficult to eradicate. Another troublesome weed of this family is the Buffalo Bur (Solanum rostratum) {Fig. 443), which has spiny fruits that catch into the wool and hair of livestock. The Madder Family {Rubiaceae). — This is one of the largest families of the Dicotyledons. There are more than 4000 species be- longing to this family, but the majority of them are tropical. They include herbs, shrubs, and trees. Their flowers are epigynous, and the stamens and lobes of the calyx and corolla are the same in number (usually 4-5). The Coffee tree {Fig. 444), which is grown extensively in Brazil, Arabia, and Java, is the most important plant of the family. The fruit {Fig. 445) of the Coffee tree is a cherry-like drupe containing two seeds, and these seeds are the coffee of commerce. The Cinchona tree, growing wild in the Andes and cultivated in India, furnishes Cinchona bark from which quinine is made. Gourd Family {Cucurbitaceae). — This family includes the Gourds, Pumpkins, Squashes, Melons, and Cucumbers. The flowers are epigynous, and the plants are monoecious or dioecious {Fig. 6). The stamens are usually more or less united. In our region there are only a few species of this family and none of much importance except those mentioned above. Composite Family (Compositae).—This is an immense fam- ily and is of world-wide distribution. It is the highest group. Fig. 443.— a plant of the Buffalo Bur bearing flowers and fruits, showing the character of the plant (X xV) J ^nd a single flower, showing the prickly calyx and gamopetalous corolla. After 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
