. Elementary botany . Botany. 226 MOVEMENTS that some flowers { Lychnis vespertina) are closed by day but open by Fig. 253.—Capitulum of Dandelion open. Fig. 254.—Ditto closed. Name. Opening Time. Closing Time. Capitulum of Tragopogon pratense 4-5 9-10 ("Go to bed at noon "): Capitulum of Taraxacum officinale 5-6 „ 5 (Dandelion). Flower of Anagallis arvensis (Scarlet 8 „ Pimpernel, Poor-man's Weather- glass). Capitulum of Calendula arvensis 9 ,, (Marigold). Flower of Lychnis vespertina (Evening 7 Lychnis). IRRITABILITY OF MOVING ORGANS. These regularly
. Elementary botany . Botany. 226 MOVEMENTS that some flowers { Lychnis vespertina) are closed by day but open by Fig. 253.—Capitulum of Dandelion open. Fig. 254.—Ditto closed. Name. Opening Time. Closing Time. Capitulum of Tragopogon pratense 4-5 9-10 ("Go to bed at noon "): Capitulum of Taraxacum officinale 5-6 „ 5 (Dandelion). Flower of Anagallis arvensis (Scarlet 8 „ Pimpernel, Poor-man's Weather- glass). Capitulum of Calendula arvensis 9 ,, (Marigold). Flower of Lychnis vespertina (Evening 7 Lychnis). IRRITABILITY OF MOVING ORGANS. These regularly recurring (periodic) movements of leaves and flowers are liable to be disturbed by changes in the temperature or moisture of the air, or by changes' iii' the illumination of the plant, These changes act as stiiiiuli and cause "itiduced ; If at daytime we put a Clover. 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 Groom, Percy, 1865-1931. London : G. Bell
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1898
