338 BOTANICAL GAZETTE [November 



Harbor, lat. 68° 37' 38" N., long. 96 23' 40" W., and T.eurylepium 

 Dahlst, from Herschell Island (cf. pi. XXXI rig. c). Dahlstedt 

 had seen no achenes for either of his two proposed species, but a 

 study of Walpole 1987 reveals the black achenes, as in typical 

 T. lyratum. Numerous variations in foliage and involucre con- 

 nect the form clearly with true T. lyratum, and make it impossible 

 to draw any specific distinctions. 



2. Taraxacum ceratophorum (Led.) DC. Prodr. 7:146. 1838; 

 Leontodon ccratophorus Ledebour, Icon. PI. Fl. Ross. 1:9. pi. 34. 

 1829; Fl. Altaica 4:149. 1833; T. montanum Nutt. (non Mey. et 

 DC), Trans. Amer. Phil. Soc. n.s. 7:430. 1841; Wooton and 

 Standley, Contrib. U.S. Nat. Herb. 19:627. 1915; T. lividum 

 Heller, Bull. Torr. Bot. Club 24:480. 1897 (exclud. synon. Waldst. 

 et Kit.); T. Chamissonis Greene, Pittonia 4:228. 1901; T. lacerum 

 Greene, loc. cit. 230; T. dumetorum Greene, loc. cit. 230; T. mutilum, 

 Greene, loc. cit. 239; T. leiospermum Rydb., Bull. Torr. Bot. Club 

 32:137. 1905; T. oblanceolatum Nels. ex Rydb., Fl. Colorado 410. 

 1906 (ex synon. T. dumetorum Greene); 5 T. lapponicum Handel- 

 Mazzetti, Monogr. Taraxacum 73. 1907 (saltern quantum ad plantas 

 americanas, forsan non Kihlm.); Leontodon dumetorum Rydb., 

 Fl. Rocky Mts. 1035. 1917; L. leiospermum Rydb., loc. cit.; L. 

 monticola Rydb., loc. cit. — PI. XXXII. 



Herba valde polymorphs, plerumque robustior, 7-25 ( -35) 

 cm. alta. Radix crassiuscula, nigrescenti-corticata, collo haud vel 

 vix squamato, glabro vel sparsissime lanato. Folia laxe procum- 

 bentia, adscendentia vel erecta, herbacea, viridia vel pallida, 

 glabra vel infra sparsissime pilosa, lanceolata' vel oblanceolata, 

 1-6 ( -9) cm. lata, infra saepe longe attenuata, ad apicem acuta 

 vel obtusa, leviter sinuato-dentata vel variis modis runcinato- 

 incisa, raro integra vel tenuissime dissecta, lobis acutis, latius 

 angustiusve triangularibus, integris vel dentatis, acutis, lobo 

 terminal! plerumque maiore. Scapi singuli vel numerosi, suberecti, 

 florendi tempore foliis plus minusve aequilongi, denique elongati, 

 iuveniles plus minusve lanato-pilosi. Capitula magna, 1 . 5-2 . 5 cm. 

 alta et 2-5 cm. lata. Involucrum griseo-viride vel nigrescens, 

 interdum pruinosum. Involucri foliola corniculis plus minusve 



s Aven Nelson 8236, distributed by Nelson as T. oblanceolatum, is likewise 

 referable to T. ceratophorum. 



