116 {JMBELLIFER^E. (PARSLEY FAMILY.) 



6. BUPLEURUM, Tourn. Thorough-wax. 



Calyx-teeth obsolete. Fruit somewhat twin. — Herbs with simple entire 

 leaves. 



1. B. ranunculoides, L. Radical leaves linear-lanceolate; cauline 

 ones clasping, cordate-oblong, striate : involucre about 3-leaved, unequal ; 

 leaflets of the involucel 5, ovate, mucrouate. — Head-waters of Madison, 

 Gallatin, and Snake Rivers. 



7. CI CUT A, L. Water Hemlock. 



Calyx-teeth small, acute. Stylopodium depressed. Commissure narrow. — 

 Smooth, tall branching marsh perennials, with stout hollow stems : umbels 

 many-rayed : roots thick and fascicled, very poisonous : flowering in summer. 



1. C. maeulata, L. Stout, 3 to 6 feet high : lower leaves on petioles 

 1 or 2 feet long, bipinnate ; leaflets oblong-lanceolate, coarsely serrate: invo- 

 lucre usually wanting: involucels of 6 to 8 narrow lanceolate leaflets: flowers 

 white : fruit broadly ovate. — Across the continent from the Atlantic to 

 Washington and the Sierras 



2. C. (?) trachypleura, Watson. Stem a foot or more high, striate, 1 

 to 3-leaved, bearing 2 to 3 umbels on long peduncles : leaves ternatcly decom- 

 pound, segments fl/i form : invuhirre and involucels of\ to 3 small subulate leaflets: 

 flowers yellow : fruit twin-ovate. — Bibl. Index, i. 417. Thaspium trachypleu- 

 rum, Gray. Colorado. 



8. SIUM, L. Water Parsnip. 



Calyx-teeth obsolete (in ours). Stylopodium depressed and styles short 

 Commissure narrow. — Smooth perennial aquatics, with angled stems: leaves 

 pinnate and leaflets serrate : involucre and involucels of several bracts : 

 flowers white. 



1. S. cicutsefolium, Gmelin. Tall: leaflets linear, lanceolate, or ob- 

 long-lanceolate, tapering to a sharp point. — S. linearc, Jlichx. From Colo- 

 rado to the Saskatchewan and the Atlantic ; also along the Pacific slope. 



9. OSMORRHIZA, Raf. Sweet Cicely. 



Calyx-teeth obsolete. Carpels 5-angled. Seed terete, sulcate on the face 

 or with margins contiguous and enclosing a central cavity. — Perennials, with 

 thick aromatic roots, more or less hirsute : leaves large, 2 to 3-ternately com- 

 pound : involucre small or none. 



1. O. nuda, Torr. Rather slender, 2 or 3 feet high, more or less pubes- 

 cent with spreading hairs : umbel long-peduncleil, 3 to 5-rayed, usually naked : 

 style and stylopodium very short. — Pacif. R. Rep. iv. 93. From Colorado 

 westward and along the coast from California to Alaska. Closely allied to 

 the Eastern 0. brevistylis. 



2. O. longistylis, DC Branching, 2 or 3 feet high : leaflets sparingly 

 pubescent or smooth with age, short-pointed : style slender, nearlt/ as (onq as_ the 

 ovary. — From the Dakotas eastward across the continent. 



