. American bee journal. Bee culture; Bees. 1921 AMERICAN BEE JOURNAL 307 poplar (Liriodendron tulipifera), will serve to show the influence these fac- tors have on the nectar resources of the State. White and alsike clovei's occur in considerable quantities and tulip-poplar forms a generous per- centage of the forest areas. By na- ture, however, the clover and tulip are opposites. Clover, a resident of the North, is found in cultivated or open lands, while tulip-poplar, a rela- tive of tropical plants, is confined to the forests. Therefore, to state that clover and tulip are common through- ou
. American bee journal. Bee culture; Bees. 1921 AMERICAN BEE JOURNAL 307 poplar (Liriodendron tulipifera), will serve to show the influence these fac- tors have on the nectar resources of the State. White and alsike clovei's occur in considerable quantities and tulip-poplar forms a generous per- centage of the forest areas. By na- ture, however, the clover and tulip are opposites. Clover, a resident of the North, is found in cultivated or open lands, while tulip-poplar, a rela- tive of tropical plants, is confined to the forests. Therefore, to state that clover and tulip are common through- out the State is misleading. Clover Since clover is confined to lands not under constant cultivation, its abundance will be determined largely by the character of the agriculture. In the Midland, where dairying is an industry or hay is raised in large amounts, alsike and white clover are extensively found. On the Eastern Shore, wherever clover will grow, it does well, but here again the agricul- ture limits its abundance, and in some soils it is impossible to secure a stand of it. In the mountain region clover is not found to any extent. Clover is not at its optimum except where lime is abundant and its fame as a honey plant comes from glaci- ated regions where the soil is rich in lime. None of the soils of Maryland are of glacial origin, and the lack of native lime is shown by the vegeta- tion. Chestnut and chestnut oak are commonly found and neither of these are tolerant of lime. There is more lime in the Midland region than else- where. Temperature also has a decided bearing on the nectar secretion from clover, and where clover thrives best in the State the temperature is not long favorable. It has been shown by Hawkins that, in Wisconsin, on glaciated soils rich in lime, the nectar yield from clover ends when the daily mean temperature reaches 74 de- grees, although clover continues to bloom thereafter. The following shows the mean daily temperature for a ten-year period in M
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