. Botany of the living plant. Botany. 536 BOTANY OF THE LIVING PLANT outer short, the inner long, with black tips. These suj-round numerous tubular disc-florets. Ray-florets are usualh- absent. The single disc-floret consists of : Calyx, represented by numerous bristles (pappus), rising from the top of the inferior ovary. Corolla, petals 5, gamopetalous, superior, rather longer than the pappus. The five equal teeth are borne at the end of the corolla-tube, which is narrower below and widens upwards into a bell. Androecium, stamens 5. epipetalous, alternating with the petals, inserted by five d
. Botany of the living plant. Botany. 536 BOTANY OF THE LIVING PLANT outer short, the inner long, with black tips. These suj-round numerous tubular disc-florets. Ray-florets are usualh- absent. The single disc-floret consists of : Calyx, represented by numerous bristles (pappus), rising from the top of the inferior ovary. Corolla, petals 5, gamopetalous, superior, rather longer than the pappus. The five equal teeth are borne at the end of the corolla-tube, which is narrower below and widens upwards into a bell. Androecium, stamens 5. epipetalous, alternating with the petals, inserted by five distinct filaments on the throat of the corolla-tube at the point where it dilates. Anthers united into a tube (syngenesious).. Fig. 44:. I. Whole (\iu\\in\ oi\^Chrysantk:inian. II. same in median section. III. disc- floret in earlier fmalel condition. I\'. same in later (female) condition. \'. ray- flnret. \'I. style and stigma. \TI. disc-floret in section. \'III. floral diagram. Gvnoecium, carpels 2, syncarpous, ovary inferior, unilocular, \rith one anatropous ovule. Style elongated, bearing in fully matured flowers two antero-posterior lobes, which diverge beyond the tube of the anthers. Fruit, a brown striated nut, bearing the wide-spread pappus at the tip, b)- means of which it is distributed by the wind. Pollination. If several flowering heads be examined from above it will be seen that the flowers mature in acropeial succession, the oldest being outside. The corolla bursts, the syngenesious and introrse anthers protrude, and the pollen is driven out of them by the elongating style, the stigmatic lobes being still appressed ; later these expand, exposing their inner receptive surfaces. The flowers are thus protandrous. There is honey-secretion in the corolla- tube, but the flowers are rarely visited by insects, and self-polUnation is certainly common. (43) The Ox-Eye Daisy [Chrysanlheiniini leucaniheinuui, L.), belonging also to the Tubuliflorac, is a common perennial
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
