. The botany of crop plants : a text and reference book. Botany, Economic. LEAVES 43 -itendnis jleajleh As examples of the latter, may be mentioned the small, scale leaves on underground stems, the scales enwrapping the growing point in buds, the bracts in grass inflorescences, and the petals, stamens and car- pels of flowers. We look upon ordinary foliage leaves as the most common, and hence "normal," sorts of leaves. We would regard scale leaves, bracts, bud scales, and flower parts as "modified" leaves. Leaves may function as (i) food-making organs (foliage leaves), (2)
. The botany of crop plants : a text and reference book. Botany, Economic. LEAVES 43 -itendnis jleajleh As examples of the latter, may be mentioned the small, scale leaves on underground stems, the scales enwrapping the growing point in buds, the bracts in grass inflorescences, and the petals, stamens and car- pels of flowers. We look upon ordinary foliage leaves as the most common, and hence "normal," sorts of leaves. We would regard scale leaves, bracts, bud scales, and flower parts as "modified" leaves. Leaves may function as (i) food-making organs (foliage leaves), (2) protective structures (scales), (3) reproductive organs (floral organs), and (4) as storage organs. The fleshy leaves that make up the bulb of onion are good examples of leaves used for storage. Foliage leaves are either par- allel-veined or netted-veined. In leaves with parallel venation, there are many veins, about equal in size, running parallel, and joined by inconspicuous veinlets. This type of venation is characteristic of the leaves of grasses, sedges, rushes, lilies and most all other monocotyledonous plants. In leaves with netted venation, which is so well illustrated in leaves of apple, oak, maple, potato, cabbage and other dicotyledonous plants, there are a few. ^sUpules Fig. 19.—A single compound leaf of sweet 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 Robbins, Wilfred William, 1884-1952. Philadelphia : P. Blakiston's Son
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectbotanyeconomic
