. Botany for agricultural students . Botany. UNDERGROUND STEMS 177 Underground Stems. — The Potato, Onion, and Artichoke are familiar examples of underground stems. Many of the plants grown in the greenhouse and on the lawn for decoration, such as the Lilies, Hyacinth, Tulip, Crocus, etc., have un- derground stems. This type of stem is common among plants with the vernal habit. Many of our useful Grasses, as Red Top, Kentucky and Canada Blue Grass, Orchard Grass, and others have peren- nial subterranean stems from which aerial stems are sent up each year. Grasses of this type live many years a
. Botany for agricultural students . Botany. UNDERGROUND STEMS 177 Underground Stems. — The Potato, Onion, and Artichoke are familiar examples of underground stems. Many of the plants grown in the greenhouse and on the lawn for decoration, such as the Lilies, Hyacinth, Tulip, Crocus, etc., have un- derground stems. This type of stem is common among plants with the vernal habit. Many of our useful Grasses, as Red Top, Kentucky and Canada Blue Grass, Orchard Grass, and others have peren- nial subterranean stems from which aerial stems are sent up each year. Grasses of this type live many years and are the Grasses which produce our permanent pastures. Grasses of this type are also chosen for lawns, because their spreading underground stems produce a compact sod and send up a thick aerial growth. Quack Grass, Johnson Grass, some Morning Glories, Poi- son Ivy, and many other weeds have underground stems, and it is due to this feature that such weeds are hard to eradicate. Cutting off the aerial stems of these weeds does not kill the plant; for the underground portion still lives and is able to send up more aerial stems. Underground stems are least adapted for displaying leaves and bearing flowers, and they must either produce leaves and flower stalks long enough to reach above ground or grow branches which become aerial stems upon which the leaves, flowers, and fruit are. Fig. 152. — Mornmg Glory twining around a Corn 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 & Sons, Inc.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
