2a. Flower-stalks bearing a single flower
=Wood Sorrel, Oxalis acetosella.=

2b. Flower-stalks bearing an umbel of several flowers
=Wood Sorrel, Oxalis violacea.=

3a. Stem prostrate and creeping Wood Sorrel, Oxalis repens.

3b. Stem erect or ascending --4.

4a. Pedicels with spreading pubescence
=Wood Sorrel, Oxalis corniculata.=

4b. Pedicels with appressed pubescence
=Wood Sorrel, Oxalis stricta.=

GERANIACEAE, the Geranium Family

Herbs, with deeply lobed or divided leaves; flowers regular, with 5
sepals, 5 petals, 5 or 10 stamens, and a 5-celled ovary.

1a. Anthers 5 (spreading or ascending plants, 2-4 dm. high; flowers pink
or purple, spring and summer) --2.

1b. Anthers 10 --3.

2a. Leaves pinnately dissected =Stork's-bill, Erodium cicutarium.=

2b. Leaves palmately divided into cuneate lobes
=Crane's-bill, Geranium pusillum.=

3a. Leaves ternately divided, the lobes pinnatifid (2-4 dm. high;
flowers purple, late spring and summer)
=Herb Robert, Geranium robertianum.=

3b. Leaves palmately 3-11-lobed --4.

4a. Petals 12 mm. long or more (3-6 dm. high; flowers pale purple,
spring) =Wild Geranium, Geranium maculatum.=

4b. Petals less than 10 mm. long (Crane's-bill) --5.

5a. Seed-bearing portion of the pistil smooth, glabrous or nearly so
(low spreading plant; flowers purple, late spring and summer)
=Crane's-bill, Geranium columbinum.=

5b. Seed-bearing portion of the pistil transversely wrinkled (widely
branching. 1-3 dm. tall; flowers purple, summer)
=Crane's-bill, Geranium molle.=

5c. Seed-bearing portion of the pistil pubescent (widely branching. 1-5
dm. tall) --6.

6a. Leaves divided almost to the base (flowers pinkish or white,
spring and summer) --7.

6b. Leaves divided one-half to two-thirds the way to the base
(flowers purple, summer)
=Crane's-bill, Geranium rotundifolium.=

7a. Petals white or pale pink; flowers in compact clusters
=Crane's-bill, Geranium carolinianum.=

7b. Petals pink-