. Plant studies; an elementary botany. Botany. 136 PLANT STUDIES the uusuitablo insects, wliieli Kenier calls " unbiilden guests," are ants, and adaptations for reducing their visits to a minimum may be taken as illustrations. (1) Hairs.âA common device for turning back a,nts, and other creeping insects, is a barrier of hair on the stem, or in the iiowcr cluster, or in the flower. (:.') Ghtiiduliir scrrcfioHS.âIn some cases a sticky secretion is exuded fr(jm the surface of plants, which eifoctively stops the smaller creep- ing insects. In certain species of catch-lly a sticky ring gi
. Plant studies; an elementary botany. Botany. 136 PLANT STUDIES the uusuitablo insects, wliieli Kenier calls " unbiilden guests," are ants, and adaptations for reducing their visits to a minimum may be taken as illustrations. (1) Hairs.âA common device for turning back a,nts, and other creeping insects, is a barrier of hair on the stem, or in the iiowcr cluster, or in the flower. (:.') Ghtiiduliir scrrcfioHS.âIn some cases a sticky secretion is exuded fr(jm the surface of plants, which eifoctively stops the smaller creep- ing insects. In certain species of catch-lly a sticky ring girdles each joint of the stem. [o) Isolation.â The leaves of cer- tain plants form â \i'atcr reservoirs about the stem. To ascend such a stem, , a creejiing insect must cross a. series lit' such I'csei'voirs. Teasel furnishes a common illustration, the (i])posite leaves being united at the l)ase and forming a sei'i(>s of cups. ]\Iore extensive water reservoirs are found in BiJbrrijia, sometimes called "traveler's tree," whose gi'eat flower clusters are pro- tected by large reservoirs formed by the rosettes of leaves, which cr(H'[)ing insects cannot cross. (4) Lati'.r.â'Idiis is a milky secretion fouiul in some jilants, as in niillvweeds. t'adutchouc is a latex secretion of certain tropical trees. When latex is ex])osed to the air it stilfens immediately, becoming sticky and linally. Fin. 14'i. A tii'C cer;i])ini; frmn flie pouch of Ctjj jri'd'nnn. iiiid rnbljiiig a^aill^L an aiitlRT,â\i CJlI'. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
