icula gregaria.=

21b. Fruit sessile, 6-7 mm. long
=Black Snakeroot, Sanicula marilandica.=

22a. Umbel unsymmetrical, its branches irregular in length; plant
slender (3-8 dm. tall; early summer)
=Honewort, Cryptotaenia canadensis.=

22b. Umbel symmetrical with regular branches; plants tall and stout
--23.

23a. Stem and leaves very pubescent (10-25 dm. high; summer)
=Cow Parsnip, Heracleum lanatum.=

23b. Stem and leaves glabrous or nearly so (5-15 dm. high; early summer)
=Masterwort, Imperatoria ostruthium.=

24a. Ovary and fruit bristly (4-10 dm. high) --25.

24b. Ovary and fruit smooth or winged, never bristly --27.

25a. Umbels loose, open, few-flowered; woodland plants blooming in
spring (Sweet Cicely) --26.

25b. Umbels densely flowered; weedy plants blooming from summer to fall
=Wild Carrot, Daucus carota.=

26a. Stem villous-pubescent =Sweet Cicely, Osmorhiza claytoni.=

26b. Stem glabrous except at the joints
=Sweet Cicely, Osmorhiza longistylis.=

27a. Leaflets merely serrate (flowers in summer) --28.

27b. Leaflets coarsely incised, so that the leaf appears dissected --30.

28a. Umbel densely pubescent (8-15 dm. high)
=Angelica, Angelica villosa.=

28b. Umbel smooth --29.

29a. Leaf-segments broadly ovate (8-15 dm. high)
=Angelica, Angelica atropurpurea.=

29b. Leaf-segments lanceolate (8-15 dm. high)
=Water Hemlock, Cicuta maculata.=

29c. Leaf-segments linear (4-10 dm. high)
=Water Hemlock, Cicuta bulbifera.=

30a. Principal branches of the umbel 2-5; fruit linear-oblong;
woodland plants blooming in spring (2-4 dm. high)
=Chervil, Chaerophyllum procumbens.=

30b. Principal branches of the umbel 7 or more; fruit ovate to
broadly elliptical (summer) --31.

31a. Native plants, growing in swamps (5-15 dm. high)
=Hemlock Parsley, Conioselinum chinense.=

31b. Introduced plants, in waste places and along roads --32.

32a. Stems conspicuously spotted