. Botany for agricultural students. Plants. forming the structure called involucre {Fig. 446)'- The flowers are epigynous, the corolla is usually tubular or strap-shaped, and the five stamens are in- serted on the corolla and usually have their anthers united in a tube around the style. The calyx is often a tuft of hairs (pappus). They have developed very effective means of dis- seminating their seeds. In many, as the Dande- lion and Thistles illus- trate, the pappus forms a parachute-like ar- rangement, which enables the fruit to l^e easily transported by the wind. In others, as the B u r d o
. Botany for agricultural students. Plants. forming the structure called involucre {Fig. 446)'- The flowers are epigynous, the corolla is usually tubular or strap-shaped, and the five stamens are in- serted on the corolla and usually have their anthers united in a tube around the style. The calyx is often a tuft of hairs (pappus). They have developed very effective means of dis- seminating their seeds. In many, as the Dande- lion and Thistles illus- trate, the pappus forms a parachute-like ar- rangement, which enables the fruit to l^e easily transported by the wind. In others, as the B u r d o c k, Cocklebur, and Spanish Needles illustrate, the fruits have hooks or spines, which catch onto pass- ing animals. Although the family is a large one, it contains only a few food plants, of which Let- tuce, Chicory, Oyster plant, the Globe Artichoke, and Jerusalem Artichoke are the chief ones. Some, as Arnica, Boneset, Camomile, DandoHon, Tansy, and Wormwood, are used some for Medicine, and from the seeds of the Sunflower oil is extracted. Fig. 444. — A Coffee tree in fruit. After Fig. 445. — Flower, fruit, and seeds of the Coffee. At the left, a flower, and at the right, a fruit with the upper portion of the ovary removed to show the two seeds. 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 resemble the original Martin, John N. (John Nathan), b. 1875. New York, John Wiley ; London, Chapman & Hall
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1919
