=Rose Pink, Sabbatia angularis.=

2b. Corolla bell-shape, each petal with a spur at the base,
purplish or white, and not over 1 cm. long (1-4 dm. high;
summer) =Spurred Gentian, Halenia deflexa.=

2c. Corolla bell-shape, tubular, funnel-form, or salver-form, not
spurred --3.

3a. Corolla-lobes fringed (flowers bright-blue) (Fringed Gentian) --4.

3b. Corolla-lobes entire --5.

4a. Leaves lanceolate (2-8 dm. high; autumn)
=Fringed Gentian, Gentiana crinita.=

4b. Leaves linear (1-4 dm. high; late summer)
=Fringed Gentian, Gentiana procera.=

5a. Corolla 2 cm. long or a little less --6.

5b. Corolla 2.5-5 cm. long (late summer and autumn) (Gentian) --7.

6a. Upper leaves linear or narrowly lanceolate (2-4 dm. high;
flowers pink-purple, late summer)
=Centaury, Centaurium umbellatum.=

6b. Upper leaves ovate, with several principal veins (1-5 dm. high;
flowers blue, late summer and autumn)
=Gentian, Gentiana quinquefolia.=

7a. Calyx-lobes rough or ciliate at the margin (flowers blue, or rarely
white) --8.

7b. Calyx-lobes smooth (2-8 dm. high) --10.

8a. Corolla-lobes spreading; leaves narrowly lanceolate,
indistinctly veined (2-5 dm. high)
=Gentian, Gentiana puberula.=

8b. Corolla-lobes erect or incurved; leaves ovate to
ovate-lanceolate, with 3-7 principal veins (3-6 dm. high) --9.

9a. Calyx-lobes equaling or exceeding the calyx-tube
=Gentian, Gentiana saponaria.=

9b. Calyx-lobes shorter than the calyx-tube
=Gentian, Gentiana andrewsii.=

10a. Leaves ovate or ovate-lanceolate, somewhat cordate at base
(flowers greenish-white or yellowish-white)
=Gentian, Gentiana flavida.=

10b. Leaves narrowly lanceolate or nearly linear, not cordate
(flowers blue) =Gentian, Gentiana linearis.=

APOCYNACEAE, the Dogbane Family

Herbs, with opposite simple entire leaves and regular flowers; sepals,
petals, and stamens each 5; petals united; stamens attached to the
corolla; ovaries 2, with a single style or st