88 



ISa. Flowers all in racemes; leaves opposite or some of them alternate 



Loosestrife, Lysimaehia terrestris. 

 13b. The lowest flowers axillary; leaves opposite or whorled 



Loosestrife, Lysimaehia producta. 

 14a. Leaves ovate, on slender ciliate petioles 



Loosestrife, Steironema ciliatum. 



14b. Leaves lanceolate, sessile or short-petioled, pinnately veined 



Loosestrife, Steironema lanceolatum. 

 14c. Leaves linear, with one mid-vein 



Loosestrife, Steironema quadriflorum. 



OLE ACE AE, the Olive Family 



Trees or shrubs, with opposite leaves and regular flowers; sepals 

 4, or calyx none; petals 4, united, or none; stamens usually 2; ovary 

 2-celled, superior. 



la. Leaves simple (shrub 2 5 m. high; flowers blue or white, in 

 showy clusters in spring) Lilac, Syringa yulgaris. 



Ib. Leaves compound (trees; flowers greenish, inconspicuous, in 

 spring) (Ash) 2. 



2a. Lateral leaflets sessile Black Ash, Fraxinus nigra. 



2b. Lateral leaflets stalked 3. 



3a. Twigs sharply 4-angled Blue Ash, Fraxinus quadrangnlata. 



3b. Twigs not distinctly angled 4. 



4a. Leaves pubescent beneath Red Ash, Fraxinus pennsylvanica. 



4b. Leaves glabrous beneath 5. 



5a. Leaves pale-green beneath, obscurely -serrulate 



White Ash, Fraxinus americana. 

 5b. Leaves bright-green beneath, sharply serrulate 



Green Ash, Fraxinus pennsylvanica var. lanceolata. 



GENTIANACEAE, the Gentian Family 



Herbs, with opposite or basal, entire, usually simple leaves and 

 regular flowers; sepals, petals, and stamens equal in number, 4 12; 

 ovary superior, 1-celled. 



la. Leaves reduced to small scales (14 dm. high; flowers small, 

 greenish-yellow, in summer) Bartonia, Bartonia Yirglnica. 



Ib. Leaves rounded, floating (flowers white, summer) 



Floating Heart, Nymphoides lacunosum. 



Ic. Leaves compound (24 dm. high; flowers white or bluish, early 



summer) Buckbean, Menyanthes trifoliate. 



Id. Leaves simple, whorled (12 m. high; flowers yellowish- white, 



summer) American Cohimbo, Frasera caroliniensis. 



le. Leaves simple, opposite 2. 



