23a. Leaves sessile, sepals spreading =Wake Robin, Trillium sessile.=

23b. Leaves short-petioled, sepals reflexed
=Wake Robin, Trillium recurvatum.=

24a. Ovary with 6 distinct wing-like angles --25.

24b. Ovary obtusely 3-angled or lobed --28.

25a. Stamens distinctly longer than the pistil --26.

25b. Stamens equaling or shorter than the pistil --27.

26a. Stigmas erect or nearly so, slender
=Wake Robin, Trillium grandiflorum.=

26b. Stigmas strongly recurved or spreading
=Wake Robin, Trillium erectum.=

27a. Filaments about as long as the anthers
=Wake Robin, Trillium cernuum.=

27b. Filaments half as long as the anthers or shorter
=Wake Robin, Trillium declinatum.=

28a. Leaves obtuse; petals obtuse, white
=Dwarf White Trillium, Trillium nivale.=

28b. Leaves acuminate; petals acute, purple-striped at base
=Painted Trillium, Trillium undulatum.=

29a. Leaves sessile (3-6 dm. high; flowers yellow, spring)
=Bellwort, Oakesia sessilifolia.=

29b. Leaves perfoliate (4-6 dm. high; flowers yellow, in spring) --30.

30a. Leaves minutely pubescent beneath
=Bellwort, Uvularia grandiflora.=

30b. Leaves glabrous and all glaucous
=Bellwort, Uvularia perfoliata.=

31a. Stem bearing 2 whorls of 3-9 leaves (3-6 dm. high; flowers pale
yellow, early summer) =Indian Cucumber-root, Medeola virginiana.=

31b. Stem-leaves not whorled, or all leaves basal --32.

32a. Flowers in umbels --33.

32b. Flowers in racemes or panicles --38.

33a. Plant with the odor of onions or garlic (leaves all or chiefly
basal; flower-stalks 2-8 dm. high, late spring or summer) --34.

33b. Plant not with the odor of onions (leaves basal; flower-stalks 2-3
dm. high, with an umbel of 3-6 greenish-yellow flowers in late
spring) =Clintonia, Clintonia borealis.=

34a. Leaves oblong, 2-5 cm. wide, not present when the plants are
in bloom (greenish-white flowers)
=Wild Leek, Allium tricoccum.=

34b. Leaves l