hy 



Dewei/a. OIBELLIFEIU3. 257 



heads dense, 3 lines in diameter : flowers purple or sometimes yellowish ; involucels 

 very short : fruit covered with Looked bristles. — Hook. Fl. i. 258, t. 92 ; Torrey, 

 Bot. Wilkes Exp. 31 4. 



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



* * Leaves twice or thrice pinnate, the segments small and not decurrent : flowers 

 yellow : fruit sessile: erect, very slender, branching. 



G. S. bipinnata, Hook. & Arn. Root fusiform, slender : stems a foot high or 

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

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

 small membranaceous 6 - 8-parted involucel : fruit tuberculate at base, armed above, 

 H lines long. — Bot. Beechcy, 347. 



From Monterey to the 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 unequal lobed segments : heads 

 small, the sterile flowers on long pedicels : fruit few, depressed, strongly tuberculate, 

 unarmed. — Paeif. R. Hep. iv. 91. 



Dry hills, Mcndo.-ino County, to the Sacramento Valley. In the Sierra Nevada (Duflield's 

 Ranch, Biycloin, and Plumas County, Mrs. Ames) there is found a low form with less finely 

 divided leaves. 



5. DEWETA, Torr. & Gray. 



Calyx-teeth small or obsolete. Disk 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 hipinnate, mostly radical ; flowers yellow, in large umbels ; involucre none 

 or partial, the involucels 1-sided. 



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

 from Arracacia (to which it is referred by Benth. .v Hook, in Gen. PI. i. SS5) by the depressed 

 stylopodium and terete seed, and from botli by the undivided carpophore and more involute 

 seed. 



1. D. arguta, Tun-, & Gray. Leaves simply pinnate ; leaflets 7, ovate to oblong- 

 ovate, the lowest shortly petiolulate ami often subcordate, 1 to 1A incites long, 

 finely and sharply serrate with mucronate teeth, the terminal one often 3-lobed : 

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

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

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

 somewhat prominent erect calyx-teeth. — Fl. i. (ill ; Tun'. Bot. Mex. Bound, t. 2G. 



Southern California, near the coast, from Santa Barbara to San Diego. In woods and on dry 

 hillsides, rarely collected : toot large and fusiform. 



2. D. Hartwegi, t liny. Rather stout : leaves biternate and quinate, the leaf- 

 lets more deeply lobed and less sharply toothed than in the last : umbels similar ; 



involucre noi r of 1 or 2 leaflets: fruit broader, 3 lines long; calyx-teeth obso 



lete ; ribs prominent, and nil-tubes marked by intervening ridges: ssed involute, 

 enclosing n central cavity. Proc. Am. Acad. vii. .">IJ. 



Hills bordering the lowor Sacramento (Hartweg) \ near San Francisco, A' 



3. D. Kelloggii, Gray. More Blonder, leafy at base : leaves 3-tornato, the leaf- 

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

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



