358 



BOTANICAL GAZETTE 



[NOVEMBER 



(Hb. U.S. 648981); White Heath (Piatt Co.), ballast of railroad, May 4, 

 1007, idem 1432 (Hb. U.S. 649007); Evanston, near walk, July 4, 1919, 

 Earl E. Slier jf 3089 (Hb. Field 484466 and 484467). 



Missouri: Vicinity of Springfield, pastures, August 28, 191 1, Paul C. 

 Standley 8287 (Hb. U.S. 687249). 



Nebraska: Omaha and vicinity, street, August 16, 1905, Amy C. Lawton 

 65 (Hb. Field 193610). 



New Mexico: Chama (Rio Arriba Co.), alt. 2380 m., May 26, 191 1, 

 tt\ jr. Eggleston 6665 (Hb. U.S. 660876). 



Alberta: Athabasca Landing, July 28, 1914, -4. S. Hitchcock 12158 (Hb. 

 U.S. 885176). 



Idaho: Coeur d'Aleur, abundant in lawns at city limits, August n, iQi3> 

 Henry J. Rust 396 (Hb. U.S. 870324). 



Wyoming: Yellowstone National Park, June 4, 1902, Edgar A. M earns 

 939 (Hb. U.S. 486330). 



British Columbia: Beavermouth, floodplain of Columbia, alt. 2400 ft., 

 August 18, 1905, C. H. Shaw 1149 (Hb. U.S. 622044). 



This species should not be confused with T. laevigatum A. Gray 

 (Proc. Acad. Phil. 1863:70), which was synonymous with T. lyra- 

 tum (Led.) DC. In recent American literature it has been known 

 as T. erythrospermum, but Handel-Mazzetti (Monogr. Taraxacum 

 109. 1907) has seen Willdenow's original specimen of Leontodon 

 laevigatum and found that T. erythrospermum is purely synonymous 

 with it. Britton (loc. cit.), familiar only with the name Taraxacum 

 erythrospermum, but rejecting the generic name Taraxacum, has 

 lately used the name Leontodon erythrospermum for this species; 

 but this last combination (made by Eichw t ald in 1830) is untenable 



* 



of course, since under the appellation Leontodon, the name Leon- 

 todon laevigatus antedates it by a number of years. Wooton and 

 Standley (loc. cit.) have confused this species with T. mexicanum 

 DC. (T. vulgar e). From their herbarium determinations and also 

 from their description, "achenes red/ 7 it is seen that their plants 

 were purely T. laevigatum. 



Specifically, T. laevigatum is much the most clearly ma 



rked 



and sharply defined of any of our native or introduced North 

 American species of Taraxacum. 



University of Chicago 



