422 Karl M. Wiegand and Arthur J. Eames 



b. Leaves 2-3-pinnatifid, the divisions 0.2-0.8 mm. wide, entire. 2. A. Abrotanum 

 a. Leaves more or less gray- or white-woolly on both surfaces, 1-2-pinnatifid (see also 

 3d a). 



b. Divisions of the leaves 1 mm. wide or less. 3. A. pontica 



b. Divisions of the leaves 2-5 mm. wide. 4. A. Absinthium 



a. Leaves green and glabrous above, white-woolly beneath. 



b. Leaves coarsely pinnatifid and cleft, broadly ovate or oval. [A. vulgaris] 



b. Leaves merely serrate, lanceolate. 5. A. serrata 



1. A. BIENNIS Willd. 



Dry gravelly railroad banks and yards; rare. Aug. 15-Sept. 



L. V. R. R. freight yards near the Ithaca station, 1917 {A. R. Bechtel & K. M. 

 W.) ; waste soil, Montezuma Marshes, 1918. 



Ohio to Mo. and B. C, southw. to Tenn., Nebr., and Calif. Adventive as a weed 

 eastw. 



2. A. Abrotanum L. Southernwood. 



Roadsides and waste places, in light soils; rare. Sept. 



Yard, Railroad Ave., Ithaca {W . IV. Rowlee) ; garbage dump at Union Springs. 

 Mass. to s. Ont., N. Y., and Nebr. Adventive from Eu. 



A specimen in the C. U. Herbarium, collected by Dudley at Junius and labeled 

 Artemisia Abrotanum, is A. pontica. 



3. A. pontica L. Roman Wormwood. 



Roadsides and waste places, in sandy or gravelly soil ; rare. July-Aug. 



By road along creek above Enfield Falls, 1917; large area by roadside 

 s. w. of Pout Pond, 1885 (£>. in C. U. Herb.) and 1919 (L. F. Randolph, A. J. E., 

 & K. M. W.). 



Mass. to Colo., southw. to N. J., Pa., and Ohio. Adventive from Eu., or an escape 

 from cultivation. 



4. A. Absinthium L. Common Wormwood. 



Roadsides and waste places, in gravelly, rarely heavier, soils ; rare. July 20-Oct. 



Escaped from gardens: near foundation of old Agricultural College barn, 1914, 

 this station now destroyed; roadside n. of Willets station, 1879 (D.) ; w. of Lowery 

 Ponds (L. H. MacDaniels & A. J. £.). 



Newf. to Hudson Bay and Mont., southw. to N. C, w. Ont., and N. Dak. 



Native of Eu. 



[A. vulgaris L. Common Mugwort. 

 Doubtfully reported from Union Springs. 

 Native of Eu.] 



5. A. SERRATA Nutt. 



Gravelly waste places ; rare. Aug.-Sept. 



Roadside, Renwick, 1916 and 1919. 



111. to Dak. Sparingly adventive in N. Y. State. 



27. Tussilago (Tourn.) L. 

 1. T. Farfara L. Coltsfoot. 



Damp open banks, usually in heavy clay soils; common. April. 



Generally distributed throughout the basin, in the clays ; rare in other soils. 



E. Que. to Minn., southw. to Pa. and Ohio; infrequent on the Coastal Plain and in 

 other sandy regions. Naturalized from Eu. 



