Peuckda.mjm. UMBELLIFERyE. 626 



Leaves witli narrow sheailis, on ralhor lontj ])oiiolrs. Umbel 5.mall, of 8-10 

 rays. Petals lanceolate, willi a lonix incurved point. Involneels verv short. 

 Flowers yellow. Wings of the carpels thin, scarcely nniUilated ; the in- 

 tervals with 3-4 viit;e. — Scarcely distinct from ihe preceding speci<!s. 



7. C. albijlorus (Nutt. ! mss. under Pteryxia) : "somewhat glaucous; 

 stem low, branching at the base ; leaves |)iiniately dcconii)ound ; the ulti- 

 mate segments divaricate and often .■3-clefi, short, acute; involneels about 

 7-parted, nearly as long as the flowering umbels ; carpels with 5 undulate 

 wings ; vittie of the commissure tJ." 



"llillsof Bear River, in the Rocky Mountain range. — Allied to the pre- 

 ceding; but the segments of the leaves arc much wider and divaricate; the 

 flowers arc also white, and the involneels conspicuous. Petals lanceolate 

 with an acuminate point. Styles long and iiliform. Fruit roundish-oval; 

 the wings undulate, ihickish and corky, so as almost to conceal the intervals." 

 Nultall. 



8. C. thapsoides (Nutt. mss. under Pteryxia) : glaucous; leaves [(innately 

 decompound, the divisions confluent; segments short, linear, obtuse, not 

 wider than the rachis ; involneels 5-7-i)arted, the lobes lanceolate ; fruit 

 oblong-oval, willi narrow dorsal wings; vitta^ of the commissure 8. 



" Rocky places in the Blue Mountains of Oregon. — Allied to C. firnicu- 

 laecus, but witli A'cry different fruit. About a span high ; the root tuberous 

 and tap-shajjcd. Petals lanceolate, with an inflexed point. Wings of the 

 fruit yellowisli. Vitta; of the lateral intervals 4, of the dorsal ones 3. The 

 plant exudes an aromatic resin." Nuttall. — We have received no specimens 

 of this Species, which is perhaps too near C. terebinthinus. 



Tribe VI. PEUCEDANE^. DC. 



Fruit mofc or less compressed dorsally, surrounded with a 

 single dilated entire smooth margin, wliich is flattened or sligiitly 

 convex, but not thickened at the edge. Carpels with .5 filiform or 

 rarely winged ribs, of which the lateral ones are contiguous to the 

 dilated margin or unitedwitli it. Seed flattened, or convex on the 

 back. 



26. PEUCEDANUM. Kodi, Umh. f. 28 c^ 29 ; DC prodr. 4. p. 17G. 



Margin of the calyx minutely .5-toothed. Petals obovate, emarginate or 

 entire, the point inflexed. Fruit flatly or lenficularly compressed on the 

 back, with a flat dilated or winged border. Carpels with 5 equidistant ribs ; 

 the 3 dorsal ones filiform; the lateral ones indistinct, contiguous to the 

 margin, or dilated into the wings. Intervals usually with single vitt;c ; the 

 lateral ones sometimes with 2 or 3 vittae. Commissure with 2-4- (rarely G-) 

 vittae. Carpophore 2-parted. Seed flat or slightly concave on tlie face. — 

 Herbaceous mostly perennial and glabrous plants. Leaves temately or 

 pinnately divided or decompound. Involucre various. Involucels many- 

 leaved. Flowers white, yellow, or yellowish-green. 



* Involucre and involucels none : flowers yellow : calyx-teeth obsolete : leaves 

 temately or 2-3-ternately divided. 



1. P. latffoUum (Nutt.! mss.): stemless and dwarfish; leaves temately 

 or biternately divided ; segments broadly ovate, obtuse, toothed at the apex, 



79 



