A University Text-Book of Botany

Cover A University Text-Book of Botany
A University Text-Book of Botany
Campbell Douglas Houghton
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Mesembryanthemum).
The more specialized types, like Dianthus, Silene, Portulaca^ etc., 3?C.
Fig. 406. — Aaarum Canadense.
have showy petals, and the calyx is often tubular. In Mesembry- anthemum (Fig. 409) many of the numerous stamens are transformed into petaloid staminodia.
In the higher Choripetalae the calyx is usually composed of united sepals, and the parts of the flower are constant in number. The sta- mens, however (Myrtaceas, Rosaceas), may be more numerous, and sometimes the carpels a
...lso, suggesting an afl&nity with the Ranales.
With the exception of some .of the Rosiflorae, also, the carpels are almost always united into a compound pistil.
Among the less specialized forms the flowers are radially sym- Digitized by Google 424 BOTANY metrical (actinomorphic), — e.g. Rosa, Papaver, Oxalis, — but many are markedly zygomorphic, as Viola, Tropseolum, Leguminosse. All degrees of cohesion of the ovary with the floral axis are found, even in the same order. Thus in the Kosales, the Crassulaceae have all the parts of the flower quite separate; in Pyrus, the carpels are more or less completely united with the floral axis, and in Kibes there is a true inferior ovary.


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