5a. A tendril or flower-cluster opposite each leaf 



Fox Grape, Yitis labrusca. 

 5b. No tendril opposite each third leaf 



Summer Grape, Yitis aestiyalis. 



6a. Pith continuous through the joints of the stem 



Fox Grape, Yitis rotund if olia, 



6b. Pith interrupted by the solid joints 7. 



7a. Leaf-lobes with rounded angles between them 



Summer Grape, Yitis bicolor. 



7b. Leaf-lobes with sharp angles between them 8. 



8a. Leaves coarsely toothed, unlobed or slightly 3-lobed 



Frost Grape, Yitis cordifolia, 

 Sb. Leaves sharply toothed, prominently lobed 



Frost Grape, Yitis yulpina. 



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. 



la. Flowers yellow (summer and autumn) 2. 



Ib. Flowers pale-yellow, with a dark center (2 4 dm. high; late sum- 

 mer) Flower-of-an-hour, Hibiscus trionum. 

 Ic. Flowers white to red or blue, never^ yellow 3. 



2a. Leaves broadly heart-shape (10 15 dm. tall) 



Yelvet 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. 



