126 Rhodora [JUNE 
The genus which was long called in America and which is maintained 
by Dalla-Torre & Harms as Trorimon Nutt. should be known as 
Agoseris Raf. The question was cleared by Greene in 1891,! but 
more recently Hall,? who has been followed by other western botanists 
has urged the retention of Troximon in the following words. 
“The reinstatement of the genus Agoseris Raf. (1817) has been 
proposed for those species of Troximon in which the achenes are 
beaked. But the two groups are best received into one genus, being 
connected by the thick-beaked 7. glaucum. Troximon was first 
used as a generic name by Gaertner (1791) but since his genus is 
not sustained, we may properly write Troximon Nutt. (1813) as the 
name of the present group." 
In Hall's argument several fundamental facts seem to have been 
overlooked. In 1791 Gaertner? published Troximon as a genus based 
upon three Linnean species of Tragopogon, Trag. Dandelion, T. vir- 
ginicum and T. lanatum. The three species were, according to Index 
Kewensis, formally named Troximon Dandelion, T. virginicum and 
T. lanatum by F. W. Schmidt in 1795 and they were certainly de- 
scribed under these binomials by Persoon in 1807. The first two are 
species of Krigia Schreber (1791), belonging to the subgenus Cynthia 
(D. Don) Gray, which is often maintained as a distinct genus Cynthia 
D. Don (1829).* The third species, Trox. lanatum, is generally referred 
to Scorzonera L. (1753). By whichever principle we reasor, whether 
we typify Troximon Gaertn. by its first species, by the greater number 
of species or by the exclusion from it of the species (T. lanatum) 
which belongs to the earlier-published Scorzonera, we arrive at the 
same conclusion, that 
'TTRoxXIMoN Gaertn. (1791) = Cynruta D. Don (1829) and should 
be used by those who maintain Cynthia as generically distinct from 
Krigia Schreb. (1791). Whether Krigia (1791) has priority over 
Troximon (1791) I have as yet been unable to determine. 
Hall, apparently considering Troximon Gaertner as a “genus 
not sustained” would retain “Troximon Nutt. (1813).” 
But what was Trorimon Nutt. (1813)? The reference ordinarily 
given is to Nutt. in Fraser’s Cat. nos. 83 and 84. Fraser's Catalogue 
1Greene, Pittonia, ii. 176 (1891). 
? Hall, Univ. Cal. Pub. Bot. iii. No. 1: 276 (1907). 
3 Gaertn. Fruct. ii. 360 (1791). 
ID. Don, Edinb, New Phil. Journ. vi. 309 (1829). 
