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1. The flowers must be wind pollinated. 2. The flowers must be very numerous. 3. The flowers are generally unscented and not conspicuouslycoloured. Some plants, like the goldenrods {Solidago), when used in largequantities in a room may prove irritant, but the pollen is not windborne and thus it is not a true hay-fever plant. Dandelions havebeen known to cause irritation when children press the flowers tooclosely to their nostrils; but the dandelion is not a true hay-fever plant.The list of plants given below has been divided into two parts: (a)those plants which are active hay-fever producers, and (b) those whichare mild. None of these plants should be used about hospitals, norwhere hay-fever sufferers are likely to come in contact with them. |
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