. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. 86 THE PLAN OF THE 268, Pistillate flower of Balm-of-Gilead. 2G9, Staminate. 270, Diploclinium Evansianum. a, staminate ; b, pistillate. 422. A neutral flower is a periauth or calyx only, having neither stamens nor pistils. Such are the ray-flowers of many of the Composite, and of the cymes of Hydrangea, high cranberry, etc., which in cultivation may all become neutral, as in the snow-ball. 271 423. Unsymmetrical flow-
. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. 86 THE PLAN OF THE 268, Pistillate flower of Balm-of-Gilead. 2G9, Staminate. 270, Diploclinium Evansianum. a, staminate ; b, pistillate. 422. A neutral flower is a periauth or calyx only, having neither stamens nor pistils. Such are the ray-flowers of many of the Composite, and of the cymes of Hydrangea, high cranberry, etc., which in cultivation may all become neutral, as in the snow-ball. 271 423. Unsymmetrical flow- ers. The term symmetry, as used in botany, refers to number only. A flower becomes unsymmetrical by the partial development of any set or circle in respect to the num- ber of its organs. The mustard family affords a good example. 424. Flowers of the cruci-- fers. The flowers of mustard, cress, etc, are understood to bo 4-merous {V)- The sepals aro four, petals four, but the stamens are six and the styles but two. The stamens are arranged in two circles, having two of those in tho outer circle suppressed or reduced to mere glands. Two of the car- pels aro also suppressed. (256.) 425. In the mint family and the figworts one or three of the stamens is generally abortive. Here, while the flowers aro \/, the stamens are four in sorao spe- cies and only two in others. Tho missing stamens, however, often appear in the guise of slender processes—the rudiments of sta- mens—proving in an interesting manner tne natural tendency to symmetry. 426. Other examples. In the V flowers of poppy, the sepais aro but two; in V spring-beauty they are but two; in both cases too few for symmetry. In lark-. 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 Wood, Alphonso, 1810-1881. New York, A. S. Barnes & Burr
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