30 BOTANICAL GAZETTE [yuLy 
altitude of 1525 m., Rio Blanco near Guadalajara, Jalisco, Mexico, October 
6, 1903; C. R. ga and W. J. G. Land 164 and 167, at altitude of 1707 m.» 
Sierra de San Estaban, Jalisco, Mexico, September 28, 1908; idem 180, at 
altitude of 1737 m., Sierra de San Estaban, Jalisco, Mexico, September 28, 1908. 
BIDENS TENUISECTA Gray, Plant. Fendl. 86. 1849; Bidens 
cognata Greene, Leafl. Bot. Crit. 1: 149. 1905. 
In describing Bidens cognata, GREENE (loc. cit.) stated that 
it was “‘allied to B. heterosperma.’’ He then proceeded to differ- 
entiate it from that species, which was very easy to do because 
B. heterosperma was so unlike it. Here, as in certain other cases 
(cf. SHERFF, Bot. Gaz. 56: 494. 1913), GREENE’S error consisted 
20 Soe: the plant to the wrong species and then founding a 
upon the points of dissimilarity. His type material 
o. B. Metcalfe 1436) is merely a low, rather much branched form 
of Bidens tenuisecta Gray, with the type of which (in Herb. Gray) 
it is connected by numerous specimens in American herbaria. 
“Brpens DILtentana’”’ Hill, Veg. Syst. 3: 123. 176r. 
This name seems to have escaped the serious attention of 
botanists for more than a century anda half. The Index Kewensis, 
although it cites the name, does not cite the habitat. Hiri 
himself (loc. cit.) called it the “dwarf hemp agrimony” and stated 
that it was a British n plant (“a petty plant of our own country’’), 
but his g tration and brief description were entirely 
too vague for satisfactory determination. However, on turning 
to his earlier work (Brit. Herb. 461. 1756), we find (under Ver- 
besina) a much fuller description of the dwarf hemp agrimony, 
along with descriptions of what are now known as Bidens cernua 
L. and B. tripartita L. This description and the earlier name 
oe cited there by Hit, Verbesina minima Ray, show positively 
that the plants later named Bidens Dilleniana were merely the 
dwarf bog form of Bidens tripartita L. or the similar form of B. 
oe : cernua L. - very a both these forms without distinction). oe 
was given evidently for the very reason __ 
i - pane (Cat. Plant. Giss. 167, App. 66. 1719; ex Ray, ee 
Syn. eae pl. 7. fig. 2. : 
Flos was the one to introduce the name 
