vary 2-celled (flowers white)
=Wild Potato Vine, Ipomoea pandurata.=

6b. Stem with reflexed hairs; ovary 3-celled (flowers of various
colors) =Morning Glory, Ipomoea purpurea.=

7a. Introduced weed, growing as a parasite on clover
=Dodder, Cuscuta epithymum.=

7b. Native species, on various shrubs and herbs --8.

8a. Flowers sessile --9.

8b. Flowers distinctly pedicelled --12.

9a. Sepals united below into a gamosepalous calyx --10.

9b. Sepals separate from each other --11.

10a. Calyx-lobes obtuse =Dodder, Cuscuta arvensis.=

10b. Calyx-lobes acute =Dodder, Cuscuta obtusiflora.=

11a. Flowers in dense rope-like twists on various species of herbs
=Dodder, Cuscuta paradoxa.=

11b. Flowers in dense clusters on various species of shrubs
=Dodder, Cuscuta compacta.=

12a. Tips of the petals inflexed =Dodder, Cuscuta coryli.=

12b. Tips of the petals erect or spreading --13.

13a. Capsule depressed at the summit =Dodder, Cuscuta cephalanthi.=

13b. Capsule pointed at the summit =Dodder, Cuscuta gronovii.=

POLEMONIACEAE, the Polemonium Family

Herbs with alternate or opposite leaves and conspicuous regular flowers;
sepals 5, united; petals 5, united and bearing the 5 stamens in the
corolla-tube; ovary superior, 3-celled.

1a. Leaves pinnately compound and alternate (2-4 dm. high; flowers blue,
in spring) =Greek Valerian, Polemonium reptans.=

1b. Leaves fascicled, narrowly linear (about 1 dm. high; flowers
pink-purple, in spring) =Moss Pink, Phlox subulata.=

1c. Leaves simple, strictly opposite --2.

2a. Corolla-lobes deeply 2-cleft to the middle (1-2 dm. high;
flowers pink, in spring) =Cleft Phlox, Phlox bifida.=

2b. Corolla-lobes entire and rounded, or somewhat notched at the
apex --3.

3a. Flowers in summer (8-15 dm. high; flowers purple)
=Garden Phlox, Phlox paniculata.=

3b. Flowers in spring (3-6 dm. high) --4.

4a. Corolla blue-purple; stems ascending
=Sweet William, Phlox divaricata.=

4b. Corolla pink or red-purple; stems erect