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Some of the plants with voluble stems ascend other plants spirally east-south-west, as Humulus, Hop, Lonicera, Honey-suckle, Tamus, black Bryony, Helxine. Others turn their spiral stems west-south-east, as Convolvulus, Corn-bind, Phaseolus, Kidney-bean, Basella, Cynanche, Euphorbia, Eupatorium. The proximate or final causes of this difference have not been investigated.
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