. Notes on the life history of British flowering plants. Botany; Plant ecology. 296 BRITISH FLOWERING PLANTS CHAP. up to the level of the stigma, so that in the absence of insects it fertilises itself. The leaves are bright green, with spreading hairs. Fig. 189 represents a flower of M. versicolor when just opened. It will be ob- served that the pistil pro- jects above the corolla and stamens, so that it must be touched first by any insect alighting on the flower. Gradually, how- ever, the corolla elongates, carrying up the stamens with it, until at length they come opposite the stigma, as sho
. Notes on the life history of British flowering plants. Botany; Plant ecology. 296 BRITISH FLOWERING PLANTS CHAP. up to the level of the stigma, so that in the absence of insects it fertilises itself. The leaves are bright green, with spreading hairs. Fig. 189 represents a flower of M. versicolor when just opened. It will be ob- served that the pistil pro- jects above the corolla and stamens, so that it must be touched first by any insect alighting on the flower. Gradually, how- ever, the corolla elongates, carrying up the stamens with it, until at length they come opposite the stigma, as shown in Fig. 190. Thus, if the flower has not already been fertilised by insects, it is almost sure to fertilise Fig. 190. versicolor. Young Fig. 189. Fig. 189.âMyosotis flower. Fig. 190.âOlder flower ; nrnch enlarged a, anther ; Cft, calyx ; co, corolla ; â nectary ; oy, ovary ; st, stigma. Anchusa Homogamous bee flowers. Corolla-tube straight, with honey at the base. Nuts attached by the broad end. Two species occur in Britain, but both are rare, and have presumably been introduced by human agency. A. officinalis has terminal forked spikes, A. semper- virens short axillary spikes. A. oificinalis.âThe corolla is at first violet, then deep blue. The entrance to the tube is guarded by five hairy, closely fitting scales. Immediately below them is the stigma, and about the middle of the tube are the anthers, so that visiting insects touch the stigma first and then the anthers. The corolla eventually detaches itself and falls ofi", carrying some of the pollen with it, and thus, in the absence of insects, fertilising the stigma. In some places, besides the usual complete flowers, others occur in which the stamens are rudimentary. The flowers difi"er also in size and in the exact position of the stamens, which, according to Schulz and Warming,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabili
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Keywords: ., bookauthorlub, bookcentury1900, bookdecade1900, booksubjectbotany
