Leptot.enia. UMBELLIFERi^. 



C29 



Rocky plains, particularly near the confluence of the Wahlamet and Ore- 

 gon Rivers, Nullall! Mr. Tnlwie! — Root ful)r'rous. Stern from a few inches 

 to a foot or more in Ifiiijih, (]ecunil)oiit. Pe(ir)lf ternately (hvidcil down to 

 the dilated hasc. Peduncles terminal and opposite the leaves, rniljcl of 

 from 12 to 20 very uneciual rays. Leaflets of the involucel often toothtil ai liie 

 suinmit. Flowers bright yellow. Petals ohcordate, with an indexed [lolnt. 

 Fruit about one-fourtli of an inch long, about the len;,nli of the perlieel : dorsal 

 ribs prominent. Intervals filled with broad thin vitt<c. — The root is used as 

 food by the aborigines. Auttall. 



P. Ludovicianuin, Raf. fl. Ludov. 



27. EURYPTERA. NuU. mss. 



Margin of the calyx 5-loothed ; the teeth lanceolate, deciduous. Petals 

 cuneate-oblong ; the point cuspidate and inflexed. Fruit reniform-orbicular, 

 emarginate at each end, flat ; the margin very broad and tliin ; tlie disk im- 

 pressed. Carpels with 5 obtuse slightly prominent approximated e(|uidistant 

 ribs. Intervals with single large vitla;. Commissure with 2 vitt<T. Seed 

 flat, somewhat concave on the back. — A perennial glabrous herb. Leaves 

 ternately divided ; the segments broadly cordate, somewhat lobed, coarsely 

 and mucronately toothed. Involucre none. Involucels unilateral, many- 

 parted. " Flowers yellowish." 



E. ludda (Nutt. ! mss.) 



Woods of St. Diego, California, Nuttall! April. — Root tuberous. 

 Leaves all radical or nearly so, simply ternately divided : segments an incli 

 or more in diameter, somewhat coriaceous ; the teeth widely spreading : 

 petioles with a large ovate sheathing base. Fructiferous peduncle very stout, 

 8-10 inches long. Rays of the umbel 10-14. Involucel 6-7-parted; the 

 segments lanceolate. Fruit about 5 lines wide, the breadth exceeding the 

 length, glabrous and somewhat sliining. 



28. IMPERATORIA. Linn. ; DC. prodr. A. ^j. 183. 



Flowers and fruit the same as in Peucedanum ; but the margin of the 

 calyx obsolete. — Perennial glabrous herbs. Stem terete, striate. Leaves 

 2-3-ternately di\dded; the segments ovate or oblong, serrate. Umbels 

 larger, compound. Involucre none. Involucel few-leaved. Flowers 

 white. DC. 



1. /. Oslruthium (Linn.): leaves ternately divided; segments broadly 

 ovate, 3-lobed, inciscly serrate ; the lateral ones unequal at the base; sheaths 

 large. DC. — Linn. spec. 1. p. 25!); Lam. ill. t. 199, /. 1.; Engl. hoi. t. 

 1380 ; DC. 2}rodr. 4. p. 183 ; Hook. Jl. Bor.-Am. l.p. 269. Peucedanum 

 Ostruthium, Koch, Umb. p. 95 ; Hook. Brit. Jl. p. 118. 



Newfoundland, Pylaie, ex DC. — Master- Wort. 



29. LEPTOTiENIA. Nutt. mss. 



Calyx-teeth nearly obsolete. Petals obovate or oblong, with an acumi- 

 nate inflexed point. Styles slender, diverging. Stylopodium inconspicuous. 



