MAR. 19, 1923 BLAKE: TWO NEW GENERA RELATED TO NARVALINA 103 
One of these, to which belong Narvalina corazonensis and N. homo- 
gama of Hieronymus, includes also the Peruvian plant lately described 
as Bidens mirabilis Sherff. Dr. Earl E. Sherff, who has been occupied 
for some years in a revision of the genus Bidens, ascribed his new 
species to that genus with some hesitation, and as the result of re- 
newed study of the plant has come independently to the conclusion 
that it must be distinguished generically. The new genus, which it is 
proposed to name Fricentrodea! in allusion to its numerous pappus 
awns, is accordingly published jointly by Dr. Sherff and the writer. 
It is distinguished from Narvalina by having the achene distinctly 
contracted at apex into a short neck or collar produced, at least in 
two of the species, into two very short branches each bearing about 
3 to “8” fragile, retrorsely hispid awns. It differs from Bidens in the 
same features, as well as in the presence of achene wings, which, 
however, are nearly obsolete in N. homogama, or even completely so 
in B. mirabilis. 
Fig. 1. a, achene of Narvalina domingensis (Cass.) Less. (Leonard 4832) ; b, Ericentrodea 
corazonensis (Hieron.) Blake & Sherff (Sodiro 44/2); c, E. homogama (Hieron.) Blake 
& Sherff (Sodiro 44/1); d, Cyathomone sodiroi (Hieron.) Blake (Sodiro 44/3). All 
x 3. 
The other genus, represented only by Narvalina sodiroi Hieron., 
has a very broadly winged achene (similar in aspect to that of Ver- 
besina, but obcompressed), bearing a pappus consisting of 2 very 
fragile awns and a turbinate spinulose-ciliolate corona about 1 mm. 
high, often adnate to the wings. 
The distinctive characters of the three genera here considered are 
given in the following key. 
lépi, much, xevrpwons, prickly. 
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