458 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



covered T. anmdelana. There are intermediates in appendage 

 width and hairiness but as indicated before some of the inter- 

 mediate series are lacking. 



The short-stemmed, appendaged series consists chiefly of a lot 

 of plants found only in two or three colonies. They tend to have 

 lanceolate, ovate, or oblong leaves. They are generally broader- 

 leaved and less hairy than T. corollata and seem to be nearest 

 related to T. zinniiflora, some specimens being very close to the 

 T. zinniiflora type. Some otherwise similar are later-blooming and 

 longer-stemmed and so included in the next series. 



The T. corollata series, characterized by appendages and long 

 stems, has several rather clearly marked groups. Nearly all the 

 plants from the central prairie region fall into the group with 

 hairless stem and leaves. They also have thick, ascending leaves 

 and tend to be pubescent on the Involucre or capsule, thus forming 

 a rather distinct morphological as well as geographical form. 

 Nearly all this series are In the four oblong- or oblanceolate-leaved 

 groups, with more or less pubescence, which may then be considered 

 the dominant form of the species locally. There is, however, a 

 marked variation in the open woodland form which tends to be 

 more hairy and to have oblanceolate leaves. 



