Development of bicellular foliar secretory cavities in white snakeroot, Eupatorium rugosum (Asteraceae)

Bicellular secretory cavities in Eupatorium rugosum occur only in foliar mesophyll, distributed uniformly from leaf tip to base, with a mean density of 450 per mm2. They are absent from petiole and all other vegetative and floral organs. Each cavity contains an oily droplet, which is surrounded by t...

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