358 BOTANICAL GAZETTE [ November 



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

 1907, idem T4S2 (Hb. U.S. 640007); Evanston, near walk, July 4, 1919, 

 Earl E. Sherff 3089 (Hb. Field 484466 and 484467). 



Missouri: Vicinity of Springfield, pastures, August 28, 1911, Paul (.'. 

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



Nebraska: Omaha and vicinity, street, Augusl [6, 1905, Amy C. Lawton 

 65 (Hb. Field 193610). 



New .Mexico: Chama (Rio Arriba Co.), alt. 2380 m., May 2(1, 101 1, 

 II'. II. Eggleston 6665 (Hb. U.S. 660876). 



Vlberta: Athabasca Landing. July 28, [914, A. S. Hitchcock 12158 (Hb. 

 U.S. 885176) 



Idaho: Coeur d'Aleur, abundant in lawns at city limits, August n, 1913, 

 Henry J . Rust .596 (Hb. U.S. 870324). 



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

 939 (Hb. U.S. 486330). 



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

 August 18, 1005, C. II. 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- 

 I inn (Led.) DC. In recent American literature it lias been known 

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

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

 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 Eichwald in 1830) is untenable 

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

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

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

 DC. (T. vulgare). From their herbarium determinations and also 

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

 were purely T. laevigatum. 



Specifically, T. laevigatum is much the most clearly marked 

 and sharply defined of any of our native or introduced North 

 American species of Taraxacum. 



University of Chicago 



