Abstract
It is quite generally accepted now that the wind-borne pollens are responsible for the seasonal symptoms of hay fever and asthma. Insect-pollinated plants cannot be blamed for the causation of allergic manifestation by ordinary exposure. For these reasons the numerous insect-pollinated plants and flowers, among which are the roses, chrysanthemums, goldenrod and fruit trees, have been absolved from blame. However, some of these insect-borne pollens are toxic and are capable of producing allergic symptoms if contact with the mucous membranes is assured. In this group may be mentioned particularly the goldenrod and pyrethrum families. The pyrethrum flower is a member of the large order of Carduales, to which the ragweeds also belong. Very close contact with the ordinary garden species of pyrethrum has been known to cause allergic reactions among gardeners. However, the most important source of allergy to pyrethrum is exposure to insecticides made from the latter. For this
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