40 BOTANICAL GAZETTE [JULY 
diaphanis. Achaenia linearia, subplana, nigra, ciliata, ad facies 
sparsim hispida, 1.3 cm. longa, ad apicem nonnullis erectis setis 
coronata, biaristata aristis retrorsum hamosis et divaricantibus. 
E.W. D. Holway 816, Quezaltenango, Guatemala, January 31, 1917 (type 
in Herb. Gray). 
BIDENS SAMBUCIFOLIA Cav. Icon et Descript. 3:15. pl. 229. 
1794; Bidens alamosana Rose, Contrib. U.S. Nat. Herb. 1:104 
pl. 6. 1891. 
A comparison of the type illustration of Bidens alamosana with 
that of B. sambucifolia reveals a remarkable similarity. Further- 
more, the descriptions of the two species are very close and differ 
materially only in that the ligules of B. sambucifolia are described 
as scarlet; those of B. alamosana are yellow or orange-yellow. 
CAVANILLES’ description was based upon material from the 
Royal Garden at Madrid and which was stated by him to have 
come originally from Peru and Mexico. It may well be that his 
citation of Peru was entirely erroneous, as I have never been able 
to find a specimen from elsewhere than Mexico. An examination 
a numerous specimens collected in Mexico shows the ligules to be 
: y yellow or orange-yellow, but in certain rare cases the ligules 
nae the dried specimens) have a color so reddish as to explain quite 
plausibly how Cavanilles was led to call them scarlet (“corolla 
<e  Ceree Thus, for example, a specimen by T. S. Bran- 
_ degee, collected at Culiacan, Sinaloa, Mexico, September 12, 1904 
; Gn Herb. Univ. on has one flowering head with a distinct — 
reddi it ge ligules. The other two flowering heads 
: present on ‘Se same ne have yellow-orange ligules. Clearly, 
_ CAVANILLES and Rose were dealing with the same species, and the 
. Bidens dersagi antedating . ue alamosana sd neety = 
SOUL SIV LCGLLCL Get Lillis tial eee ce Be 
