190 



Carduus acanthoides flourishes. The persistent rosettes of the 

 last are very large and well suggest the Acanthus from which the 

 specific name is derived. 



W. VV. Bailey. 

 Brown University, September 14, 1906. 



An Addition to the Flora of Block Island. — The sum- 

 mer flora of Block Island was described, together with a list of 

 species, by W. W. Bailey, in 1893,* and the writer was able to 

 make a few additions to this list during the summer of 1897. f 

 The locality is isolated and absolutely devoid of trees, so that the 

 flora is necessarily very limited and is restricted to such species 

 as can exist on sea beaches or sand dunes, in open swamps or on 

 dry hills. In the latter habitat a few of the species which were 

 established there when the region was covered with trees still 

 persist, and among these it is interesting to note that this year I 

 found numerous specimens of Botrychiuni obliqmini Aluhl., on the 

 summit of Mohegan bluffs, where it occurs as part of the dense 

 mat of vegetation, consisting largely of Solidago nemoralis Ait., 

 Aster t'imincus Lam., Achillea Millefoliinn L., Potentilla canadensis 

 L. and Paniciun dichotoimnn L., which covers the hill-tops. 



Arthur Hollick, 

 New York Botanical Garden. 



Tubular Ray-flowers in Gaillardia aristata. — Among 

 several specimens of Gaillardia aristata Pursh, collected near 

 Magnolia, Colo, and Eldora, Colo., a few were found in which 

 the ray-flowers had a tubular form. Gaillardia aristata is a very 

 conspicuous species in this region, ranging from the plains to an 

 altitude of 10,000 feet. Examination of the specimens in the 

 University herbarium shows none having these tubular rays. It 

 therefore appears that the abnormality is not common. 



The specimens agree with the description given for this species 

 by Britton and Brown in every particular except in the rays. 

 Some of the rays are normal 3-lobed rays, one of which is repre- 

 sented in Figure i. On the same flower-head were found inter- 

 mediate forms as shown in Figure 2, alongside tubular rays as 



*Bull. Torrey Club 20 : 227-239. 1893. 

 fAnn. N. Y. Acad. Sci. il : 63-70. 1898. 



