The Plants of Michigan Part 42

NYMPHAEACEAE, the Water Lily Family

Aquatic plants, with usually large and floating leaves which are round or elliptical and palmately veined.

1a. Floating and emersed leaves centrally peltate --2.

1b. Leaves rounded but not peltate, with a deep sinus --3.

2a. Leaves round, 3 dm. in diameter or more; flowers very large, pale yellow =Lotus, Nelumbo lutea.=

2b. Leaves oval, 5-15 cm. long; flowers small, purple =Water s.h.i.+eld, Brasenia schreberi.=

3a. Flowers yellow (Pond Lily) --4.

3b. Flowers white or tinged with pink (Water Lily) --5.

4a. Leaves more than 1 dm. long =Pond Lily, Nymphaea advena.=

4b. Leaves less than 1 dm. long =Pond Lily, Nymphaea microphylla.=

5a. Flowers very fragrant; leaves purplish beneath =Water Lily, Castalia odorata.=

5b. Flowers not fragrant; leaves green beneath =Water Lily, Castalia tuberosa.=

RANUNCULACEAE, the Crowfoot Family

Herbs with alternate (rarely opposite) leaves, acrid watery juice, separate sepals and petals, numerous stamens, and several or many (rarely only 1) simple pistils. Petals present or absent, in the latter case the sepals are usually petal-like in appearance.

1a. Climbing plants with opposite leaves (flowers in late summer) (Virgin's Bower) --2.

1b. Aquatic plants with dissected submerged leaves (flowers in late spring and summer) (Water Crowfoot) --3.

1c. Terrestrial or mud plants, not agreeing with 1a or 1b --6.

2a. Flowers white, 2-3 cm. wide =Virgin's Bower, Clematis virginiana.=

2b. Flowers pink-purple, 5-8 cm. wide =Virgin's Bower, Clematis verticillaris.=

3a. Flowers white --4.

3b. Flowers yellow --5.

4a. Leaves rigid, not collapsing when removed from the water =Water Crowfoot, Ranunculus circinatus.=

4b. Leaves soft, collapsing when removed from the water =Water Crowfoot, Ranunculus aquatilis var. capillaceus.=

5a. Submerged leaves divided into hair-like segments =Water Crowfoot, Ranunculus delphinifolius.=

5b. Submerged leaves palmately divided into linear lobes =Water Crowfoot, Ranunculus purs.h.i.+.=

6a. Flowers blue, irregular, with one spur (4-8 dm. high, summer) =Larkspur, Delphinium ajacis.=

6b. The five petals each prolonged into a spur; flowers showy (4-8 dm. tall) (Columbine) --7.

6c. Flowers regular, without spurs --8.

7a. Spurs nearly straight; flowers scarlet and yellow (spring) =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 pal.u.s.tris.=

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) =b.u.t.tercup, Ranunculus rhomboideus.=

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