ple)
=Blue Hearts, Buchnera americana.=

35a. Stem finely pubescent (3-6 dm. high; flowers pale-violet, late
spring) =Beard-tongue, Pentstemon hirsutus.=

35b. Stem glabrous below the inflorescence (6-12 dm. high) --36.

36a. Corolla-tube gradually enlarged from base to tip (flowers
pale-violet, in early summer)
=Beard-tongue, Pentstemon laevigatus.=

36b. Corolla-tube abruptly enlarged just beyond the calyx (flowers
white, early summer)
=Beard-tongue, Pentstemon laevigatus var. digitalis.=

37a. Corolla distinctly irregular, 2-lipped (1-4 dm. high; flowers
yellowish or white, summer) --38.

37b. Corolla regular or nearly so and 2-lobed, or none --6a.

37c. Corolla regular or nearly so, 4-lobed --40.

38a. Leaves narrowed at the base, with mid-vein
=Hedge Hyssop, Gratiola virginiana.=

38b. Leaves rounded or somewhat clasping at the base, with 3-5
principal veins (False Pimpernel) --39.

39a. Peduncles longer than the subtending leaves
=False Pimpernel, Ilysanthes anagallidea.=

39b. Peduncles shorter than the subtending leaves
=False Pimpernel, Ilysanthes dubia.=

40a. Leaves whorled (8-20 dm. high; flowers white or pale-blue, in
spikes, summer) =Culver's Root, Veronica virginica.=

40b. Leaves alternate or opposite (Speedwell) --41.

41a. Flowers in racemes, which arise from the axils of the opposite
leaves (flowers pale-blue to nearly white, late spring and summer)
--42.

41b. Flowers solitary in the axils of leaf-like bracts, or in terminal
bracted racemes (1-4 dm. high; spring and summer) --46.

42a. Stem and foliage glabrous; swamp plants 2-7 dm. high --43.

42b. Stem and foliage pubescent; plants of dry ground, 1-3 dm. high
--45.

43a. Leaves linear or narrowly lanceolate
=Marsh Speedwell, Veronica scutellata.=

43b. Leaves ovate or ovate-lanceolate --44.

44a. Stem-leaves sessile and somewhat clasping
=Water Speedwell, Veronica anagallis-aquatica.=

44b. Stem-leaves on short petioles
=Brooklime, Veronica americana.=

45a. Leaves narrowed at base