116 UMBELLIFER.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, mucronate. Head-waters of Madison, 

 Gallatin, and Snake Rivers. 



7. CICUTA, 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. maculata, 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 & to 8 narrow lanceolate leaflets : flowers 

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

 Washington Territory 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 ternatelt/ decom- 

 pound, segments flli form : involucre and involucels of I to 3 small subulate leaflets: 

 flowers yellow: fruit twin-ovate. Bibl. Index, i. 417. Thaspium track i/pleu- 

 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. lineare, Michx. 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-teruately com- 

 pound : involucre small or none. 



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

 cent with spreading hairs : umbel long-peduncled, 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, nearly as long as the 

 ovary. From Dakota eastward across the continent. 



