50 Trans. Acad. Sci. of St. Louis. 



longer than in Carolinianus while in elatus they are dis- 

 tinctly shorter. 



3. Elephantopus elatus Bertol. 



Misc. Bot. 11:21. 1851. 



This very striking form from the Southern States has 

 occasioned no little trouble. Dr. Robinson kindly furnished 

 a transcription of the original description and a tracing of 

 the plate. Here is referred the tall, heavily clothed, much 

 branched form with radical leaves narrowed at base, and with 

 short heads and pappus, as is beautifully illustrated by speci- 

 mens of Chapman's, and by Rolf's No. 657, both from 

 Florida. It apparently occurs throughout the Southern 

 States east of the Mississippi and is somewhat variable. In 

 the short heads it resembles nudatus. In its leaf forms it 

 resembles var. nudicaulis of tomentosus. In its vestiture and 

 length of pappus it is distinct from either. Some of the 

 forms under consideration may be hybrids, though only 

 actual experimentation can give us any direct evidence. 

 There seems to be no reason why the name elatus is not avail- 

 able here. 



4. Elephantopus nudatus Gray. 



Proc. Am. Acad. 15 : 47. 1880. 



Dr. Gray separated this species on the very short and broad 

 paleae of the pappus, and the character of the vestiture. It 

 occurs from Delaware to Florida and Louisiana. It is most 

 typical in the Northeast, while towards the Southwest 

 some very puzzling forms occur, though whether these are 

 due to extreme variability within the species or to hybridiza- 

 tion is impossible to say. With Prof. Earle, the author 

 distributed some of these very peculiar forms from the Her- 

 barium of the Ala. Biol. Survey. 



The above species may be compared as to length of achene 

 and pappus by the following table prepared by averaging in 

 millimetei-s a number of measurements taken from fairly 

 typical specimens. 



