8a. Leaves coarsely toothed, unlobed or slightly 3-lobed =Frost Grape, Vitis cordifolia.= 8b. Leaves sharply toothed, prominently lobed =Frost Grape, Vitis vulpina.= TILIACEAE, the Linden Family Trees, with alternate, simple, palmately veined leaves, and clusters of fragrant white flowers in late spring arising from the middle of a leaf-like bract; sepals and petals each 5; stamens numerous, but united into 5 sets. One species in Michigan =Basswood, Tilia americana.= MALVACEAE, the Mallow Family Herbs with alternate leaves; sepals and petals each 5; stamens numerous, united by their filaments to form a tube surrounding the styles; ovary many-celled. 1a. Flowers yellow (summer and autumn) --2. 1b. Flowers pale-yellow, with a dark center (2-4 dm. high; late summer) =Flower-of-an-hour, Hibiscus trionum.= 1c. Flowers white to red or blue, never yellow --3. 2a. Leaves broadly heart-shape (10-15 dm. tall) =Velvet Leaf, Abutilon theophrasti.= 2b. Leaves ovate-lanceolate (2-5 dm. tall) =Sida, Sida spinosa.= 3a. Calyx subtended by 6 to many bractlets which are sometimes united at base (summer) --4. 3b. Calyx subtended by 3 bractlets, or by none --6. 4a. Flowers 2-4 cm. wide (5-10 dm. high; flowers pink) =Marsh Mallow, Althaea officinalis.= 4b. Flowers 7-15 cm. wide (8-15 dm. high; flowers pink to nearly white) (Rose Mallow) --5. 5a. Leaves densely pubescent below =Rose Mallow, Hibiscus moscheutos.= 5b. Leaves glabrous =Rose Mallow, Hibiscus militaris.= 6a. Petals prominently notched at the end or reverse heart-shape (Mallow) --7. 6b. Petals obtuse or truncate (summer) --11. 7a. Flowers 1-1.5 cm. wide --8. 7b. Flowers 2-5 cm. wide (3-8 dm. high; flowers in summer) --9. 8a. Stems procumbent, prostrate, or spreading (spring, summer, and autumn) =Mallow, Malva rotundifolia.= 8b. Stems erect (10-15 dm. high; summer) =Mallow, Malva verticillata.= 9a. Leaves with prominent but shallow lobes; flowers axillary =Mallow, Malva sylvestris.= 9b. Leaves deeply lobed or cleft; flowers in the upper axils, producing a raceme-like cluster --10. 10a. Lobes of the leaf dentate or incised =Mallow, Malva alcea.= 10b. Lobes of the leaf pinnately cleft into linear or narrowly oblong divisions =Mallow, Malva moschata.= 11a. Flowers white (1-2 m. high) =Virginia Mallow, Sida hermaphrodita.= 11b. Flowers purple or pink (3-5 dm. high, spreading) =Poppy Mallow, Callirhoe triangulata.= HYPERICACEAE, the St. John's-wort Family