98 SELECTED WESTERN FLORA 



2. OSMOKRHiZA. Sweet Cicely. 



Calyx teeth wanting; petals incurved at the apex; fruit narrow, 

 linear, bristly on the ribs, with short beak but tapering to a long 

 slender base. Perennial herbs from fleshy clustered roots, with 

 decompound leaves and small umbels of white flowers. 



1. O. Claytonii, (Miohx.) Clarke. ■ 



Rather slender, 1-2 ft. high, pubescent; leaves 2 or 3-ternate, hairy, 

 leaflets deeply cut; style very short. Rich damp woods, Man.-Alta. 



2. O. longistylis, (Torr.) DC. 



Coarser than the preceding, 1-3 ft. high, glabrous or nearly so ; leaflet 

 less deeply cut; style longer. Rich woods, less common, Man.-Alta. 



3. O. obtusa (Coult. and Rose) Fernald. 



Slender, 12-20 in. high, glabrous or nearly so ; rays of the umbels spreading 

 or the lateral deflexed. (O. nuda, Torr.) Rocky Mts. and eastward. 



3. CICUTA. Water Hemlock. 



Calyx teeth prominent; fruit orbicular; herbs with pinnately 

 compound leaves and white flowers. 



1. C. maculata, L. Spotted Cowbanb. 



Stem stout, 1-6 ft, high, marked with purple lines; leaves 2-3-pinnate, 

 the lower on long petioles. A coarse poisonous plant frequent in wet places, 

 Man.-Alta. This includes C. virosa in early references. 



2. C. bulbifera, L. 



Similar but more slender, with narrower leaflets, and bulbleta clustered 

 in the axils of the upper leaves, which are often simple or but little divided. 

 Swamps, chiefly northward. 



4. SiUM. Water Parsnip. 



Cajyx teeth minute; fruit oblong. Smooth perennial plants with 

 simple pinnate leaves and large compound umbels of white flowers. 



1. S. cicutaefdlium, Schrank. 



Stout, 3-6 ft. high; leaflets 3-8 pairs, sharply serrate, the lower finely 

 dissected when submerged. Wet places, Man.-Alta. and far northward. 



5. ZfZU. 



Calyx teeth prominent; fruit oblong. Smooth perennials with 

 ternate or ternately compound leaves, — sometimes the root leaves 



