UMBELLIFER^E. (PARSLEY FAMILY.) 115 



Var. Hookeri, Torr. & Gray. Rhachis narrow: fruit scabrous. Loc. cit. 

 M. trachyspermum, Nutt. From the Saskatchewan to the Upper Missouri, the 

 Platte, and S. W. Montana. 



2. M. tenuifolium, Nutt. Acaulescent, erect and somewhat cespitose, of 

 glaucous hue: leaves trip innately divided; segments linear: flowers white: fruit 

 nearly glabrous; oil-tubes with a more aromatic oil than in the former species. 

 Loc. cit. " Rocky Mountains," Nutlall. 



3. OROGENIA, Watson. 



Calyx-teeth minute. Commissure with 2 to 4 oil-tubes : carpophore aduate 

 to the carpels and forming a thick corky midrib dividing the hollowed face 

 of the commissure longitudinally. Dwarf, scarcely caulescent, glabrous : 

 root tuberous : leaves radical, 1 to 2-ternate, with entire linear segments : 

 umbel with few very short unequal rays. 



1. O. linearifolia, Watson. Stem an inch or two above ground and 

 very slender : leaves 2 or 3, upon filiform petioles, equalling the stem : umbels 

 with 2 or 3 rays ; umbellets 3 to 5-flowered : involucre none ; involucels of 

 1 to 3 linear leaflets exceeding the rays. Bot. King's Exp. 120, pi. 14. 

 Wahsatch Mountains, on damp shaded ridges. 



4. CAKUM, L. 



Calyx-teeth small. Stylopodium conical. Smooth, erect, slender biennial 

 herbs or acaulescent, with tuberous or fusiform fascicled roots : leaves mostly 

 simply pinnate with a few leaflets. 



1. C. Gairdneri, Benth. & Hook. Stem I to 4 feet high, from a tuberous 

 root: leaves few, with 3 to 7 linear entire leaflets ; the lower leaves rarely pin- 

 nate with entire or toothed divisions ; upper leaves usually simple : involucre 

 of a single linear leaflet, or often wanting ; involucels of several linear bracts : 

 flowers white. From Washington through Idaho to Wyoming, and thence 

 to S. California. A common article of food among the Indians, who call it 

 "yamp." 



2. C. (?) Hatlii, Watson. Acaulescent from a stout caudex branching at 

 the summit: leaves pinnate or pinnatisect; leaflets or segments oblong or sub- 

 ovate in outline, pinnately 3 to 7-lobed and few toothed: scape very simple, naJced, 

 surpassing the leaves, 10 inches high: involucel deeply parted : flowers yel- 

 low. Bibl. Index, i. 416. Seseli Hallii, Gray. Musenium Greenei, Gray. 

 Colorado. 



5. BE HULA, Koch. 



Calyx-teeth minute. Stylopodium conical and styles short. Commissure 

 broad. Seed terete. A smooth perennial aquatic : leaves pinnate : involucre 

 and involucels of several leaflets. 



1. B. angustifolia, Koch. Erect, to 3 feet high, the stem stout and 

 angled : leaflets about 6 pairs, ovate-oblong to linear, often laciniately lobed at 

 base, and the upper ones especially more or less deeply cut-toothed : involucre 

 and involucels of 6 to 8 entire linear-lanceolate leaflets. Sium angustifolium, 

 L. From Colorado northward, and eastward across the continent ; also in 

 California. 



