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Vegetable secretions and the means by which by are effected by Kate L. Hudson, 1888

Vegetable secretions and the means by which by are effected by Kate L. Hudson, 1888, Page 45

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41. identification, in taking transverse sections of the fruit, are first, the various number, position and size of the ribducts, then the outline of the seed section, the nature of the pericarp and the rib sections. In the different genera, the oil-ducts occur in varying number, size and positions and are found to be sufficiently constant to afford characteristics. The most common position for oil-ducts, is in the space between the ribs, where they occur singly or in groups. We have in the umbelliferae one of those orders in which plants recur with extremely different secretions.
 
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