. Nature and development of plants. Botany. 484 THE CAMPANULALES anthers are aggregated and usually cohere, forming a sheath about the style which is frequently covered with hairs and acts like a piston rod in the cylinder of anthers. The flowers are protandrous with few exceptions, the anthers opening on their inner sides and discharging the spores upon the style which later sweeps them out as it elongates. The pistils are generally re- duced to a single one-ovuled carpel that ripens as an akene. Leaving out of consideration the gourds which include the melons, pumpkins, cucumber and gourd, a
. Nature and development of plants. Botany. 484 THE CAMPANULALES anthers are aggregated and usually cohere, forming a sheath about the style which is frequently covered with hairs and acts like a piston rod in the cylinder of anthers. The flowers are protandrous with few exceptions, the anthers opening on their inner sides and discharging the spores upon the style which later sweeps them out as it elongates. The pistils are generally re- duced to a single one-ovuled carpel that ripens as an akene. Leaving out of consideration the gourds which include the melons, pumpkins, cucumber and gourd, as a family of uncertain. Fig. 337. Lower forms of the Campanulales: A, inflorescence of the bellflower {Campanula). B, section of a young flower. The hairy style is pushing up between the encircling anthers and sweeping the spores out of them. Note the closed stigmatic lobes. C, older flower. The anthers are withering and the stigmas are curving back towards the spore-covered style. D, flower of Lobelia. The tubular corolla is opened at one side, per- mitting the style and encircling stamens, g, to protrude. E, section of flower, showing the anthers, a, united about the style and stigma. F, relation of stigma to anthers. At right the section shows the anthers cohering about the bushy style, which acts later as a brush sweeping out the spores. At the left the style has grown beyond the anthers and the stigmatic lobes are spreading 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
