=Wild Columbine, Aquilegia canadensis.=

7b. Spurs strongly incurved; flowers blue or white (spring, early
summer) =Columbine, Aquilegia vulgaris.=

8a. Flowers yellow --9.

8b. Flowers of various colors, but never yellow --28.

9a. Petals none; sepals petal-like; leaves crenate or dentate (2-4 dm.
high, flowers in early spring) =Cowslip, Caltha palustris.=

9b. Petals small; sepals petal-like; leaves deeply palmately lobed (4-6
dm. tall; flowers in late spring) =Globe-flower, Trollius laxus.=

9c. Petals yellow; sepals green or yellowish --10.

10a. Leaves linear to narrowly oblong, entire or with minute teeth
(flowers 10-15 mm. wide, in summer) --11.

10b. Leaves broader, some or all of them lobed or divided, or
cordate-ovate and not lobed --12.

11a. Stems ascending (4-8 dm. high), rooting at the lower joints; fruits
pointed with a long slender beak
=Spearwort, Ranunculus laxicaulis.=

11b. Stems prostrate and trailing, rooting at the joints; fruits tipped
with a minute short beak
=Spearwort, Ranunculus flammula var. reptans.=

12a. Basal leaves, or most of them, merely serrate or crenate, and
not obviously lobed --13.

12b. All the leaves lobed or divided --16.

13a. Stem-leaves resembling the basal ones, and not lobed (1-2 dm. high;
summer) =Sea-side Crowfoot, Ranunculus cymbalaria.=

13b. Stem-leaves deeply divided into oblong or linear segments --14.

14a. Flowers 1.5 cm. wide or more (1-3 dm. high; spring)
=Buttercup, Ranunculus rhomboideus.=

14b. Flowers 1 cm. wide or less (2-5 dm. high; spring) --15.

15a. Foliage glabrous or minutely pubescent; basal leaves cordate
=Small-flowered Crowfoot, Ranunculus abortivus.=

15b. Foliage villous; basal leaves barely cordate or not at all
=Small-flowered Crowfoot, Ranunculus micranthus.=

16a. Stem erect or essentially so --17.

16b. Stem prostrate, creeping, or ascending. Early in spring
stems may be found which appear almost erect. Common
spring-flowering buttercups are all classified here --22.

17a. Flowers 2 cm. broad or larger (Buttercup) --18.

17b. Flowers 1 cm. broad or smaller --19.

18a. Ter