,82 



17a. Leaves palmately or ternately once-compound 18. 

 17b. Leaves 2 3 times compound or decompound 24. 



18a. Flowers short-pedicelled, crowded in head-like umbels, 

 greenish; ovary bristly (4 9 dm. high; early summer) (Black 

 Snakeroot) 19. 



18b. Flowers in open umbels, white 22. 

 19a. Styles short, not projecting beyond the bristles of the mature 



fruit 20. 

 19b. Styles long, projecting beyond the bristles of the fruit, and 



recurved 21. 



20a. Staminate flowers on pedicels 3 4 mm. long, equaling or 



barely exceeding the fruit Black Snakeroot, Saniciila trifoliate. 



20b. Staminate flowers short-pedicelled, concealed among the 



fruits Black Snakerootj Sanicula canadensis. 



21a. Fruit short-stalked, 4 mm. long or less 



Black Snakeroot, Sanicula 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 (410 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 yillosa. 

 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 maculate. 

 29c. Leaf-segments linear (4 10 dm. high) 



Water Hemlock, Cicuta bulbifera. 



