626 UMBELLIFERtE. Peuckuanum. 



the lateral ones slightly petiolulate ; rays of the umbel elongated, rather 

 slender ; peduncle short and very thick ; friiit eUipticai-oblong, with a very 

 narrow winged border; dorsal ribs slightly prominent; intervals with 2-3 

 minute vittsc ; commissure with 6 distant vittfe. 



Plains east of Wallawallah River, Oregon, Nuttall! — Leaves with rather 

 long narrow sheathing petioles : segments about an inch and a half long and 

 an inch broad ; the terminal one cuneate at the base and almost retuse ; the 

 summit witli 3-8 broad raucronate teeth. Peduncles 4-5 lines in diameter, 

 somewhat thickened at the summit. Rays of the umbel 2-5 inches long. 

 Fruit about 3i lines long, rather acute : vitt;e scarcely visible through the 

 cuticle. 



2. p. leiocarpum (Nutt. ! mss.) : nearly stemless, somewhat glaucous ; 

 leaves triternately divided ; segments petiolulate, oblong, entire or toothed at 

 the apex ; rays of the umbel slender and elongated, unequal ; fruit shorter 

 than the pedicel, narrowly elliptical, with a narrow winged border ; dorsal 

 ribs slightly prominent ; intervals with single vittse ; commissure with . 4 

 (rarely 6) closely approximated vittte. — Seseli leiocarpum. Hook. ! fl. Bor.- 

 Am. 1. 2J. 262, t. 93. 



/?. camiiestre (Nutt. mss.) : segments of the leaves linear-oblong ; fruit 

 longer than the pedicel. 



Plains of the Oregon near Fort Vancouver &c. Douglas, Dr. Scouler! 

 Nuttall! On Lewis River, Mr. Tolmie! June-July. — "Root long and 

 fusiform," Nutt. Leaves with long narrow sheaths; the segments about an 

 inch long, narrower in the sterile than in the fertile plant, often 2-3-toothed 

 towards "the apex. Peduncle about a foot in length, stout ; in the fructiferous 

 plant tumid at the summit. Rays of the umbel 1-5 inches long. Fruit 

 half an inch long ; the border much narrower than the dorsal disk. Vittse of 

 a light brown color ; sometimes 2 in the lateral intervals, one of them much 

 smaller than the other. 



3. P. ambiguum (Nutt. mss.) : caulescent and somewhat branching, glab- 

 rous ; leaves triternately divided ; segments linear-lanceolate, entire, obtuse ; 

 sheaths large and ventricose. — Eulophus ambiguus, Nutt. ! in jour. acad. 

 Philad. 7. p. 27. 



Borders of Flat-Head River, Oregon, Mr. Wyeth. April. — About a span 

 high (when in flower). " Root consisting of smaU'round edible tubers," Nutt. 

 Middle division of the leaf sometimes pinnately 5-7-parted. Umbels lateral 

 and terminal. Flowers polygamous. Fruit unknown. 



* * Involucre none : involucels of numerous setaceous leaflets : calyx-teeth obso- 

 lete : flotoers yellow : leaves 1-3-ternately divided ; the segments narrow, elon. 

 gated and entire. 



-/"' 4. P. triternatum (Nutt.! rass.) : peduncle, petioles, and margin of the 

 ' leaves minutely pubescent ; leaves sometimes simply but usually 2-3-ter- . 

 nately divided ; the segments lanceolate-linear, or narrowly linear, attenu- 

 ated at each end ; sheaths somewhat inflated^ fruit twice as long as the pedi- 

 cels, narrowly elliptical ; the winged margin half the breadth of the disk ; 

 intervals with single vittEE ; commissure with 2-vittfe. — Seseli biternatum, 

 Pursh. fl. 1. p. 197; DC. prodr. 4. p. 196; Hook.! fl. Bor.-Am. 1. p. 

 204, t. 94; Hook. ^- Am. hot. Beechey, sujopl. p. 348. Eulophus triternatus, 

 Nutt.! in jour. acad. Philad. 7. p. 21. 



/?. leptocarpum : glabrous ; fruit lanceolate-elliptical, narrowly Avinged ; 

 pedicels very short. — P. leptocarpum, Nutt.! mss. 



Plains of the Rocky Mountains ! and throughout Oregon to the Pacific ! 

 /?. plains of the Oregon near the confluence of the Wahlamet, Nuttall ! July. 



