102 THE ORCHIDS OF NEW ENGLAND, 
culata, the “ Heal-all” of Pennsylvania. Its glossy silver-lined 
leaves, often nine inches across, lie, like those of H. Hookeri 
(the Small Round-leaved Orchis), close to the needle-strewn 
ground, and the waspish green and white flowers are lifted from 
one to two feet above then. “ Many light-colored flowers,” 
writes Miiller, “ which often grow in shady places, are inconspic- 
uous by day but conspicuous by night (e. g. Platanthera). 
These are chiefly visited by crepuscular Lepidoptera,* but in- 
sects are excluded not so much by the color as by the situation 
of the honey at the base of long, nar- 
row tubes.” | 
The arrangements for fertilization 
are substantially the same as those of 
FH. Hookert. “The way,” says Gray, 
“in which the anterior (lower) por- 
Fic. 31.—HeEap oF Motn, Sphinx. . 
drupiferarum,with attached andde- tion of the anther-cells with the com- 
ressed pollen-masses of Habenaria . . 
Pe hnulate, bined arms of the stigma taper and 
Front view of flower of H. orbi- 
culata, showing anther-cells and ex- 
posed viscid discs. discs on a sort of beak,a little in 
Disc and part of pedicel. (All ; 
from Gray’s Botanical Text Book.) advance of the orifice of the nec- 
project forward, so as to raise the 
tary, is well exhibited in Hooker’s figure of this species (/7. 
macrophylla) in the Flora Bor. Amer., but the discs do not look 
outwardly in the manner there represented. These, being 
affixed to the stalk of the pollen-mass laterally, by that inter- 
mediate body called the “ drum-like pedicel” (here developed 
perhaps even more than in H. Hookert) really look forward and 
inward—in fact are so placed that they will be sure to stick 
fast, one to each side of the head of a humble bee or of a large 
moth that thrusts its proboscis down into the spur so as to 
reach the nectar. As the divergent bases of the anther-cells 
are so separated by the broad stigma that the viscid discs 
stand nearly a quarter of an inch apart and the full-grown spur 
is from one inch to an inch and a half long, it is evident that 
* Butterflies, moths, etc., that fly after sunset. 
