. The biology of flowering plants. Phanerogams; Plant physiology; Plant ecology; Plant Physiology. Above, erect (left) and creeping (right) shoots of Periwinkle, the latter with twisted petioles. Below, horizontal shoot of Buddleia with twisted 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 Skene, Macgregor. New York, The Macmillan Company

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Keywords: ., book, bookcentury1900, bookdecade1920, booksubjectplantphysiology