998 Compositae Echinops 



state. Variety umbratilis Greenman usually has basal leaves which are 

 "oblong-ovate to oblong-elliptic, 2-8 cm long, 1.5-5.5 cm wide, with petioles 

 2-12 cm long." The type was collected near New Albany and it has been 

 reported from Porter County. Greenman has referred some of my speci- 

 mens from Posey and Starke Counties to this variety. Fernald (Rhodora 

 23: 299. 1921) refers this variety to Senecio pauperculus var. Balsamitae 

 (Muhl.) Fern., where it seems to belong. 



The species and the two varieties are combined on one map. 



Vt. to Mo., southw. to Fla. and Tex. 



5. Senecio aureus L. (Senecio aureus var. semieordatus (Mack. & 

 Bush) Greenman.) Golden Groundsel. Map 2189. Infrequent to fre- 

 quent in all parts of the state. It is usually found in wooded ravines on 

 wet, alluvial plains along streams, wet borders of ponds, bogs, lakes, and 

 marshes. This species is also variable and var. semieordatus has been 

 segregated. This variety is described by Greenman as having the "lower 

 leaves rotund-ovate to oblong-ovate, 1-8 cm long, 1-4 cm broad, usually 

 rounded at the apex, shallowly cordate." Greenman has referred some of 

 my specimens from Lagrange and Wells Counties to this variety. Since I 

 am not convinced that this variety has taxonomic value, I am including 

 it in the species. 



Lab., Ont. to N. Dak., southw. to Fla. and Tex. 



5. Senecio aureus L. (Senecio aureus var. semieordatus (Mack. & 

 is infrequent to rare, and I am not able to say with certainty whether it 

 is found with the species or not. My recollection is that it is not. It is 

 always found in very wet places such as bogs and marshes and never 

 common where it is found. I have made no study of it in the field to 

 ascertain how closely it is related to the species. Greenman gives the dis- 

 tribution as : "Occurring with the species." 



6. Senecio pauperculus Michx. var. Balsamitae (Muhl.) Fern. (Rhodora 

 23 : 299. 1921.) (Senecio Balsamitae Muhl. and Senecio yawpercidus Michx. 

 in part.) Map 2191. This plant prefers moist, mucky or sandy soil and 

 is usually found in fallow fields where it sometimes covers acres (near 

 Griffith, Lake County) . Less frequent in prairie habitats along roadsides 

 and in open flats in woods. Local in its distribution. Reported also from 

 St. Joseph and Wabash Counties. 



N. S. to Minn., southw. to Va. and Mo. 



9442. ECHINOPS L. 



See excluded species, no. 685, p. 1103. 



9452. ARCTIUM L. Burdock 



[Fernald and Wiegand. A synopsis of the species of Arctium in North 

 America. Rhodora 12: 43-47. 1910.] 



Involucre less than 2 cm wide; outer bracts about 10 mm long, inner bracts not ex- 

 ceeding the flowers; heads racemose; petioles usually hollow 1. A. minus. 



