. Beginners botany. Botany. 78 BEG/XXEKS' HOTAXY from leaves. As a rule leaves can be distiiiguishcd by the foll<.)\ving tests: (i) fi^/Ji/o/ti/j's/j/zc/zors, sooner or later falling. (2) Usually /'/u/s arc borne in their axi/s. (3) Leaves are usually borne at joints or nodes. (4) They arise on wood of the cnrrent years groivth. (5) They have a more or less iiejinite arrangement. When leaves fall, the twig that bore them remains; when leaflets fall, the main i:)etiole or stalk that bore them also falls. Shapes. — Leaves and leaflets are infinitely variable in shape. Names have
. Beginners botany. Botany. 78 BEG/XXEKS' HOTAXY from leaves. As a rule leaves can be distiiiguishcd by the foll<.)\ving tests: (i) fi^/Ji/o/ti/j's/j/zc/zors, sooner or later falling. (2) Usually /'/u/s arc borne in their axi/s. (3) Leaves are usually borne at joints or nodes. (4) They arise on wood of the cnrrent years groivth. (5) They have a more or less iiejinite arrangement. When leaves fall, the twig that bore them remains; when leaflets fall, the main i:)etiole or stalk that bore them also falls. Shapes. — Leaves and leaflets are infinitely variable in shape. Names have been given to some of the more definite or regular shapes. These names are a part of the language of bot- any. The names represent ideal or typical shapes; there are no two leaves alike and very few that perfectly con- form to the definitions. The shapes are likened to those of familiar ob- jects or of geometrical figures. Some of the commoner shapes are as follows (name original examples in each class): Linear, several times longer than broad, with the sides \ nearly or quite parallel. Spruces and most grasses are examples (Fig. 102). In linear leaves, the main veins are usually parallel to the midrib. Oblong, twice or thrice as long as broad, with the sides \ parallel for most of their length. Fig. 103 shows the short-oblong leaves of the box, a plant that is used for permanent edgings in gardens. Fig. 102.— Linear- acuminate Leaf of Fig. 103. — Short-oblong Leaves of 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 Bailey, L. H. (Liberty Hyde), 1858-1954. Toronto : Macmillan
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1921
