Red or Soft Maple (_Acer rubrum_) April. Alders (_Alnus_) April. Elm (_Ulmus_) April. Willows (_Salix_) Apr.-May. _Dandelion_ (_Taraxacum taraxacum_ = _T. officinale_ of Gray's Manual) Apr.-May. _Sugar_, _Rock_, or _Hard Maple_ (_Acer saccharum_ = _A. saccharinum_ of Gray's Manual) Apr.-May. _Juneberry_, or _Service Berry_ (_Amelanchier canadensis_) May. Wild Crab Apples (_Pyrus_) May. GOOSEBERRY and CURRANT (_Ribes_) May. PEACH, CHERRY, and PLUM (_Prunus_) May. PEAR and APPLE (_Pyrus_) May. Huckleberries and Blueberries (_Gaylussacia_ and _Vaccinium_) May-June. COMMON, BLACK, or YELLOW LOCUST (_Robinia pseudacacia_) May-June. European Horse-chestnut (_Æsculus hippocastanum_) May-June. Common Barberry (_Berberis vulgaris_) May-June. TULIP TREE, or "WHITEWOOD" (_Liriodendron tulipifera_) May-June. Grapevines (_Vitis_) May-June. Rape (_Brassica napus_) May-June. _White Mustard_ and _Black Mustard_ (_Brassica alba_ and _B. nigra_) June. RASPBERRY (_Rubus_) June. WHITE CLOVER (_Trifolium repens_) June-July. ALSIKE CLOVER (_Trifolium hybridum_) June-July. Edible Chestnut (_Castanea dentata_ = _C. sativa_ var. _americana_ of Gray's Manual) June-July. ALFALFA, or LUCERN (_Medicago sativa_) June-July. LINDEN, or BASSWOOD (_Tilia americana_) July. Smooth Sumac (_Rhus glabra_) July. _Buttonbush_ (_Cephalanthus occidentalis_) July. MELILOT, BOKHARA, or SWEET CLOVER (_Melilotus alba_) July-Aug. Indian Corn (Zea mags) July-Aug. Melon, Cucumber, Squash, Pumpkin (_Citrullus_, _Cucumis_, and _Cucurbita_). July-Aug. _Fireweed_ (_Erechthites hieracifolia_) July-Sept. Chicory (_Cichorium intybus_) July-Sept. GREAT WILLOW-HERB (_Epilobium angustifolium_) July-Aug. KNOTWEEDS (_Polygonum_, especially _P. pennsylvanicum_ and _P. persicaria_). Aug.-Sept. BUCKWHEAT (_Fagopyrum fagopyrum_ = _F. esculentum_ of Gray's Manual). Aug.-Sept.