. Botany for agricultural students. Plants. plants are like those of the preceding families in character of the ovary and seeds but differ from them in having a perianth differentiated into a showy corolla and a large calyx (Fig. 1^.26). They are regarded as a transition group between the Apetalae and Poly- petalae. Among them are some garden favorites, such as the Carna- tions, Pinks, Sweet Wilhams, and Lychnis, and also some weeds of which the Chickweeds, Corn Cockle, Cow-herb, and Bouncing Bet are common ones. Polijpetalae As previously stated the Poly- petalae have petals and the petals ar
. Botany for agricultural students. Plants. plants are like those of the preceding families in character of the ovary and seeds but differ from them in having a perianth differentiated into a showy corolla and a large calyx (Fig. 1^.26). They are regarded as a transition group between the Apetalae and Poly- petalae. Among them are some garden favorites, such as the Carna- tions, Pinks, Sweet Wilhams, and Lychnis, and also some weeds of which the Chickweeds, Corn Cockle, Cow-herb, and Bouncing Bet are common ones. Polijpetalae As previously stated the Poly- petalae have petals and the petals are generally separate. The colored corolla is usually distinct from the green calyx, and the flowers are pol- linated chiefly by insects. Among the lower families of the Polypeta- lae, as the Buttercups (Ranunculaceae) illustrate, the flower usu- ally has numerous stamens and a number of separate pistils. The calyx and corolla are also attached below the stamens and pistils or, in other words, the flowers are hypogynous. In passing to the more ad- vanced families of the Polypetalae, the number of stamens and carpels become more definite, and assume the cyclic ar- rangement. There is also a tendency for the carpels to join and a tendency of the flower toward epigyny in the higher families. Crowfoot or Buttercup Family (Ramrn- culaceae). — This family includes numer- ous species, mostly herbs, having in common separate petals, and separate sepals. The stamens and connnonly the carpels Fig. 426. — A portion of a plant of Corn"" Cockle {Agro- stemma Githago) (X|). The flowers have a perianth consist- ing of a calyx and showy corolla. Modified from Fig. 427. — A flower of a Buttercup, .showing the many stamens and pistils. 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 Martin, John N.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1919
