THE ORCHIDS OF NEW ENGLAND. AI 
of the other species, is curved upwards, so that the front of 
the flower is made somewhat tubular, and is divided into 
halves. Thus a moth is compelled to goto the one or other 
side, and its face will almost certainly be brought into contact 
with one of the discs. Professor Gray has seen a butterfly 
from Canada with a pollen-mass of this species attached to 
each eye.” HY. Hookert has. the muskiness characteristic of the 
family but no “strong, 
sweet odor,” such as is at- 
tributed to H. chlorantha. 
A variety, oblongifolia, oc- 
curs in New York State, 
differing, as the adjective 
implies, simply in the Fic. aL aatay ee CHLORANTHA. (From vai tains 
A. Front view of flower. a, a, anther-cells; d, disc ; 
shape of the leaves. m,nectary; z’, entrance to nectary ; Z, labellum; s, 
: stigma. 
The first time I analyzed B. A pollinium (this has hardly a sufficiently elon- 
’ gated appearance). The drum-like pedicel is hidden 
a> flower: of Ttooket’s +9 caraiay 
Habenaria I was struck C. Diagram giving a section through the viscid disc, 
the drum-like pedicel and the attached end of the 
with the prominent beak  caudicle. The disc is formed of an upper mem- 
brane, with a layer of viscid matter beneath. 
between the bases of the D. Side view of flower of H. Hookeri. 
anther-cells. “In both divisions of the Ophree,” Darwin says, 
“namely the species having naked discs, and those having discs 
enclosed in a pouch—whenever the two discs come into close 
juxtaposition a medial crest or process, sometimes called the 
rostellate process, appears. When the two discs stand widely 
apart, the summit of the rostellum between them is smooth, or 
nearly smooth.” In the illustration of O. mascula, fig. 4, B, 
D, we see the developed crest; in the illustration of Perz- 
stylus viridis, fig. 11, “the first stage in the formation of the 
folded crest, the overarching summit bent like the roof of 
a house.” It is his belief that “whilst the two discs were grad- 
ually brought together, during a long series of generations, the 
intermediate portion or summit of the rostellum became more 
and more arched, until a folded crest, and finally a solid ridge 
