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=Hackberry, Celtis occidentalis.= 4a. Some of the branches with flat corky wings; leaves smooth above =Cork Elm, Ulmus racemosa.= 4b. Branches without corky wings; leaves more or less rough above --5. 5a. Petioles and axillary buds glabrous =White Elm, Ulmus americana.= 5b. Petioles and axillary buds pubescent with rusty hairs =Slippery Elm, Ulmus fulva.= 6a. Leaves rough above =Red Mulberry, Morus rubra.= 6b. Leaves smooth above =White Mulberry, Morus alba.= 7a. Leaves alternate --8. 7b. Leaves opposite --9. 8a. Leaves 2-5 cm. long, stems pubescent =Pellitory, Parietaria pennsylvanica.= 8b. Leaves 8-20 cm. long; stem armed with stinging hairs =Wood Nettle, Laportea canadensis.= 9a. Twining plant; leaves serrate or cleft =Hop, Humulus lupulus.= 9b. Erect plant; leaves palmately compound =Hemp, Cannabis sativa.= 9c. Erect plants; leaves not lobed or compound --10. 10a. Stems armed with stinging hairs --11. 10b. Stems glabrous or rough, but not with stinging hairs --12. 11a. Leaves ovate, with a heart-shape base =Stinging Nettle, Urtica dioica.= 11b. Leaves lanceolate or ovate-lanceolate, not heart-shape at base =Slender Nettle, Urtica gracilis.= 12a. Stems glabrous, pellucid =Clearweed, Pilea pumila.= 12b. Stems rough, opaque =False Nettle, Boehmeria cylindrica.= SANTALACEAE, the Sandalwood Family Low herbs with alternate entire leaves and terminal clusters of small greenish-white bell-shape flowers without petals in spring and early summer. 1a. Inflorescence of several-flowered clusters terminating the stem and in the upper axils =Toad-flax, Comandra umbellata.= 1b. Inflorescence of axillary clusters of 1-5 flowers =Toad-flax, Comandra livida.= LORANTHACEAE, the Mistletoe Family Parasitic plants, attached to the branches of trees. One species in Michigan, a dwarf brown plant 5-20 mm. long, with minute scale-like leaves, growing on the branches of Black Spruce
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