reenish or purplish
in late spring, on stalks 5-10 dm. high) (Alum Root) --21.

20b. Stamens 10 (flowers white, in spring) --23.

21a. Flowers regular =Alum Root, Heuchera americana.=

21b. Flowers irregular, the calyx oblique, longer on the upper side than
on the lower --22.

22a. Stamens projecting beyond the calyx
=Alum Root, Heuchera hirsuticaulis.=

22b. Stamens not projecting beyond the calyx
=Alum Root, Heuchera hispida.=

23a. Stem-leaves alternate or none --24.

23b. Stem with a pair of opposite leaves (2-4 dm. high)
=Bishop's Cap, Mitella diphylla.=

24a. Petals deeply fringed (1-2 dm. high)
=Bishop's Cap, Mitella nuda.=

24b. Petals entire (1-3 dm. high)
=False Mitrewort, Tiarella cordifolia.=

HAMAMELIDACEAE, the Witch Hazel Family

Shrubs, with alternate simple leaves; sepals, petals, and stamens each
4; ovary 2-lobed.

One species in Michigan; tall shrub with obovate leaves and yellow
flowers appearing late in autumn =Witch Hazel, Hamamelis virginiana.=

PLATANACEAE, the Plane Tree Family

Trees, with broad, palmately veined and lobed leaves, and minute flowers
in dense spherical heads.

One species in Michigan =Sycamore, Platanus occidentalis.=

ROSACEAE, the Rose Family

Trees, herbs, or shrubs, with alternate, frequently compound leaves;
petals and sepals usually 5, stamens numerous, pistils 1 to many;
receptacle expanded into a saucer-shape or cup-shape organ, bearing the
sepals, petals, and stamens at its margin, the pistils at its center,
and resembling a calyx-tube or flattened calyx.

1a. Shrubs or trees --2.

1b. Herbaceous plants --48.

2a. Leaves compound --3.

2b. Leaves simple --24.

3a. Flowers in large panicles or corymbs, each flower 5-10 mm. across;
leaflets 7 or more --4.

3b. Flowers solitary or in small clusters, each flower usually 20-80 mm.
wide; leaflets frequently only 3 or 5 --7.

4a. Flowers in a pyramidal or oblong panicle, the ovaries superior
(1-2 m. high; flowers white, in summer) --70b.

4b. Flowers in rounded or hemispheric clusters, the ovary inferior
--5.

5a. Leaves pubescent on the lower surface