- 6 S - 



5a. Seed-bearing portion of the pistil smooth, glabrous or nearly so 

 (low spreading plant; flowers purple, late spring and sum- 

 mer) Crane's-bill, Geranium columbinum. 



5b. Seed-bearing portion of the pistil transversely wrinkled (widely 

 branching, 1 3 dm. tall; flowers purple, 'summer) 



Crane ? s-bill, Geranium molle. 



5c. Seed-bearing portion of the pistil pubescent (widely branching, 

 15 dm. tall) 6. 



6a. Leaves divided almost to the base (flowers pinkish or white, 



spring and summer) 7. 



6b. Leaves divided one-half to two-thirds the way to the base 

 (flowers purple, summer) 



Crane's-bill, Geranium rotundifolium. 

 7a, Petals white or pale pink; flowers in compact clusters 



Crane's-bill, Geranium carolinianum. 

 7b. Petals pink-purple; flowers in loose clusters 



Crane's-bill, Geranium bicknellii. 



KUTACEAE, the Rue Family 



Shrubs or low trees, with compound leaves frequently dotted with 

 translucent glands; flowers small, greenish-white, with 3 5 sepals, 

 petals, and stamens. 



la. Leaflets 5 9; stems thorny 



Prickly Ash, Zanthoxylum americanum. 

 Ib. Leaflets 3; stems not thorny Hop Tree ? Ptelea trifoliata. 



SIMARUBACEAE, the Quassia Family 



Trees, with pinnately compound leaves and small greenish-yel- 

 low flowers in large panicles in early summer, ripening into winged 

 fruits. 



One species in Michigan, escaped from cultivation chiefly in towns 



Tree of Heaven, Ailanthus glandulosa. 



POLYGALACEAE, the Milkwort Family 



Small herbs, with alternate or whorled simple leaves, and small 

 irregular flowers; sepals 5, petals 3, stamens 6 or 8, more or less 

 united with each other and with the petals. 



la. All of the leaves alternate 2. 



Ib. Some or all of the leaves in whorls (1 4 dm. high; flowers 

 greenish, purple, or white; summer) (Milkwort) 6. 



2a. Flowers few, loosely clustered, 15 20 mm. long (1 3 dm. 

 high; flowers purple; early summer) 



Flowering Wintergreen, Polygala paucifolia. 



2b. Flowers numerous, in a spike or raceme 3. 



