Deweiid. UMBKLLIFEH.E. 257 



liojiils dense, 3 lines in dianieter : llowers ptirple or sometimes yellowisli ; involucels 

 very sliort : fruit eovercd with hooked liristles. — Hook. ¥\. i. 2r>S, t. 1)2 ; Torrcy, 

 ]Jot. Wilkes Exp. 314. 



From the Sacramento Valley to the Columbia ; Sierra Co., Lcmmon. 



* * Leaver twice or thrice pinnate, the segmenta small and not decurrent : Jlowers 

 ydlow : fruit sesxile : erect, very slender, hranchin;/. 



6. S. bipinnata, Hook. S: Am. Koot fusiform, slender: steins a foot higli or 

 more : ultimate .segments of the leaves 3 or 4 lines long, acutely toothed : umbels 

 about 3-rayed, with a leafy involucre ; heads small, two lines in diameter, with a 

 small membranaceous - 8-parted involueel : fruit tuberculate at base, armed above, 

 H lines long. — Bot. Beechey, 347. 



From Monterey to tlie Upper Sacramento Valley. 



7. S. tuberosa, Torrey. Stem 3 inches to a foot high, from a small tuberous 

 root : leaves usually very finely divided, the segments less than a line in length : 

 rays 1 to 4 ; involucres leafy ; involucels small, of unetpial lobed segments : heads 

 small, the sterile flowers on long pedicels : fruit few, depres.sed, strongly tuberculate, 

 unarmed. — Pacif IJ. Hep. iv. 91. 



I)?y hills, Mendocino County, to the Sacrnmcnto Valley. In the Sierm Nevada (DuflTiekl's 

 IJancli, lii(jdoK\ and Plumas County, Mrs. Ames) there is found a low form with less finely 

 divided leaves. 



5. DEWErA, Torr. & Gray. 

 Calyx-teeth small or obsolete. Di.sk and stylopodium depressed or wanting. 

 Fruit oblong-elliptical or orbicular, compressed laterally ;ribs somewhat prominent, 

 and with 2 or 3 obscure secondary lines between each pair ; oil-tubes 2 to 3 in the 

 intervals, conspicuous. Seed terete, involute, often enclosing a central cavity. 

 Carpophore entire. — Smooth erect perennial herbs, 1 or 2 feet high ; leaves pin- 

 nate or })i pinnate, mostly radical ; flowers yellow, in large umbels ; involucre none 

 or partial, the involucels 1 -sided. 



An exclusively Califoinian genus, distinguished from Conium by the conspicuous oil-tubes, 

 from Arracacia (to which it is refeired by JJcntii. k Hook, in Oen. PI. i. SS.*)) by the depressed 

 stylojiodiuni and terete seed, and from botli by tlio undivided cinpophoro and more involute 

 seed. 



1. D. arguta, Torr. k Gray. Leaves simply pinnate; leaflets 7, ovate to oblf)ng- 

 ovate, the lowest shortly pctiolulate and often subcordate, 1 to 1^ inches long, 

 finely and sharply serrate with niucronate teeth, the terminal one often 3-lolied : 

 peduncle elongated: rays about 12, without involucre, 2 or 3 inches long: invo- 

 lucels of 2 or 3 linear acuminate entire or toothed bracts : pedicels two lines long : 

 fruit oblong, three lines long, acutely ribbed, with rather broad commissure and 

 somewhat prominent erect calyx-teeth. — V\. i. 041 ; Torr. I'ot. Mex. Bound, t. 26. 



Southern California, near the const, from Santa Paibnra to Snu I>iego. In woods and on dry 

 hillsides, rarely collected : root large and fusiform. 



2. D. HartTVegi, Hray. Bather .<5tout : leaves bitcrnato and quinate, the leaf- 

 lets more deeply lobed and less sharply toothed than in the ]a.st : umbels similar ; 

 involucre none or of 1 or 2 loallets : fruit broader, 3 lines long ; calyx-teeth obso- 

 lete ; ribs iirominent, and oil-tubes marked by intervening ridges: S5ed involute, 

 enclosing a central cavity. — Proc. Am. Acad. vii. 342. 



Hills liordering the lower Sacramento (Hartirrg) ; near Snii Francisco, Kdloffg. 



3. D, Kelloggii, Gray. More slender, leafy at bnse : leaves 3-ternate, the leaf- 

 lets a half to an inch long, mostly 3-lobed, murronately toothed : involucre none : 

 rays 10 to 12, an inch long or more; involucels of very small subulate bracts : 



