estris.=

13b. The lowest flowers axillary; leaves opposite or whorled
=Loosestrife, Lysimachia 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.=

OLEACEAE, 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.

1a. Leaves simple (shrub 2-5 m. high; flowers blue or white, in showy
clusters in spring) =Lilac, Syringa vulgaris.=

1b. 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 quadrangulata.=

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.

1a. Leaves reduced to small scales (1-4 dm. high; flowers small,
greenish-yellow, in summer) =Bartonia, Bartonia virginica.=

1b. Leaves rounded, floating (flowers white, summer)
=Floating Heart, Nymphoides lacunosum.=

1c. Leaves compound (2-4 dm. high; flowers white or bluish, early
summer) =Buckbean, Menyanthes trifoliata.=

1d. Leaves simple, whorled (1-2 m. high; flowers yellowish-white,
summer) =American Columbo, Frasera caroliniensis.=

1e. Leaves simple, opposite --2.

2a. Corolla rotate, with spreading lobes, 2-4 cm. broad, pink (5-8 dm.
high; summer)