Text-book of structural and physiological botany . carlet pimpernel, A nagallisarvensis^ with axillary flowers. Fig. 140.—2/5 phyllotaxis of the oak. always easy to recognize in practice. Of the leaves ofgrasses, for example, one half follow a right-handed, theother half a left-handed spiral. The spiral arrangementis often obscured by the leaves standing in a fasciculate The External Form of Plants. 89 manner on a branch which has remained undeveloped, asin the larch. Since the secondary axes (branches) generally springfrom axillary buds, it follows that their arrangement on thestem is depende
Text-book of structural and physiological botany . carlet pimpernel, A nagallisarvensis^ with axillary flowers. Fig. 140.—2/5 phyllotaxis of the oak. always easy to recognize in practice. Of the leaves ofgrasses, for example, one half follow a right-handed, theother half a left-handed spiral. The spiral arrangementis often obscured by the leaves standing in a fasciculate The External Form of Plants. 89 manner on a branch which has remained undeveloped, asin the larch. Since the secondary axes (branches) generally springfrom axillary buds, it follows that their arrangement on thestem is dependent on the phyllotaxis of those leaves in theaxils of which they arise, as is seen at once in any labiateplant. It is also easily understood that an apparently alto-gether irregular arrangement of the branches on the stemmay be the result of the abortion of a number of buds. A leaf of the most perfect development may be dividedinto its sheath, its petiole or leaf stalk, and its lamina orflatly expanded blade, although one or other of these parts.
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