Summary
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1.
The wild speciesH. Lupulus is composed of a number of forms with distinctive morphological and physiological characters.
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2.
Forms similar morphologically (for the characters taken) possess distinctive physiological characters (e.g., immunity from, or degrees of susceptibility to, mildew).
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Salmon, E.S., Wormald, H. A study of the variation in seedlings of the wild hop (Humulus lupulus L.). Journ. of Gen. 11, 241–267 (1921). https://doi.org/10.1007/BF02983062
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DOI: https://doi.org/10.1007/BF02983062