or silicate back, and face with a broad sliallow concavity and cen- 

 tral longitudinal ridge. (Fig. 90. ) 



Common in the mountains of Colorado, and extending into Utah 

 (Ward), N. Arizona {Palmer 176, Lemmon 393, Rushy 630), and New 

 Mexico (Bigelow, Walcotf, RuHby). Fl. June to August. This is Hall ct- 

 Harbour 218. 



So far as we can discover, this species does not occur outside of the 

 Eocky Mountains, and chiefly in Colorado, even the range widely separat- 

 ing it from L. apiifoUum, with whi.'h it has often been confused. Certain 

 Colorado forms, commonly referred to this species, are Conioselinum 

 Canadense. In some cases the fruit is necessary to distinguish these 

 species. Collectors should carefully note whether any so-called specimens 

 of L- Hcopulorum develop fruit with lateral wings. 



4. L. Porteri. Rather stout, 2 to 8 feet high, more leafy, 

 with glabrous or puberulent inflorescence: leaves large, biternate 

 then bipinnate; the numerous rather crowded segments lanceolate 

 to lanceolate-ovate, laciniately pinnatifid, toothed or entire: umbel 

 of numerous rays, mostly with neither involucre nor involucels; 

 rays (fruiting) 1 to 2 inches long; pedicels 3 to 4 lines long; 

 flowers white or pinkish: fruit (immature) oblong-ovate, 2 lines 

 long, with more prominent winged ribs than in other species: oil- 

 tubes 4 to 6 in the intervals, 8 to 10 on the commissural side: seed 

 somewhat dorsally flattened, with very sharply angled back, and 

 face with a broad shallow concavity and central longi'tudinal ridge. 



In the mountains and foothill* of Colorado, Bear Creek {Vasey 223, in 

 1868), headwater* of Platte Eiver {Coulter, in 1873, distribed as L. apiifol- 

 ium, and described as such in Fl. Colorado); Arizona (Palmer 176, in 1877), 

 Huachuca Mts {Pringle, in 1884, distributed as L. filicirmm); New Mexico, 

 mountains near Las Vegas (G. R. Vasey, in 1881, distributed as L. apiifnl- 

 ium), near top of mesa, Eaton (Tracy 52, in 1887)- Fl. June and July. 



This is also the Colorado form referred doubtfully to L. apiifolmm by 

 Brewer & Watson in Bot. Calif, i. 264. It is a curious fact that this species 

 has always been referred to L apiifoUum or L. filicinum, two species with 

 which it cannot be confounded, and has never been referred to L scopu- 

 lorum, to which it is most nearly allied. It differs from that species chiefly 

 in its more leafy habit, more numerous crowded smaller and narrower leaf- 

 segments, naked often glabrous umbels, more ovate fruit, which is more 

 prominently wingei than in any other species, more numerous oil-tubes, 

 and seed with a very sharply angled back. 



5. L. Canbyi. Stem about 2 feet high, leafy at base, with 

 a small cauline leaf or two, and glabrous inflorescence: leaves 

 large, biternate; leaflets lanceolate, 3 to 4 inches long, pinnately 



