ORCHIDACE. 107 
Sus-Srecies Il.—Habenaria chlorantha. Dab. 
Prats MCCCCLXIII. 
Reich. Ic. Fl. Germ. et Helv. Vol. XIII. Tab. CCCCXXX. 
Billot, Fl. Gall. et Germ. Exsicc. No. 2747. 
Bab. Trans. Linn. Soc. Vol. XVII. p. 462. Man. Brit. Bot. ed. vi. p. 330. Hook. 
& Arn. Brit. Fl. ed. viii. p. 437. 
Orchis bifolia, Sm. Engl. Bot. ed. i. No. 22. 
O. montana, Schmid. Gren. & Godr. Fl. de Fr. Vol. IIT. p. 297. 
Platanthera chlorantha, Reich. Koch, Syn. Fl. Germ. et Helv. ed. ii. p. 795. Tries, 
Summ. Veg. Scand. p.61. Parl. Fl. Ital. Vol. I. p. 413. Hart. FI. Scand. 
ed. ix. p. 191. 
P. montana, Reich. fil. l.c. p. 123. Crep. Man. Fl. Belg. ed. ii. p. 294. 
Sepals lanceolate or ovate-lanceolate; spur cylindrical-clavate, com- 
pressed, decurved. Anther-cells twice as distant at the base as at the 
apex; caudicules elongate ; glands circular. 
On pastures, grassy banks, and open places in woods. Common, 
and generally distributed, except in the extreme north of Scotland. 
Frequent in Ireland. 
England, Scotland, Ireland. Perennial.. Early Summer. 
Very similar to H. eu-bifolia, but larger in all its parts. The leaves 
3 to 8 inches long; the stem 1 to 2 feet high; spike 3 to 8 inches; 
sepals about } inch long, purer white than in H. eu- -bifolia, consider- 
ably broader; the spur thitker, more compressed, and more clavate; 
but the most important difference lies in the anther-cells diverging 
greatly towards the base, and the lateral sepals are less reflexed. The 
time of flowering is considerably earlier. 
I have met with specimens on the Reigate hills about which it was 
difficult to decide whether to refer them to H. eu-bifolia or to H. chlor- 
antha. I was not at that time aware of the difference in the size 
and shape of the glands, length of the caudicule, and shape of the 
stigmatic surface, pointed out by Mr. Darwin, or it would have been 
interesting to see if these were intermediate as well as the more 
obvious characters. 
Greater Butterfly Orchis. 
Mr. Darwin, in writing on the family of Orchids, says of this species, “ I am aware 
that this form and the last are considered by some botanists as mere varieties of each 
other, but we shall see that the two forms differ in a great number of characters, not 
to mention the differences in general aspect and in the stations inhabited, with which 
we are not here concerned. Should these two forms be hereafter proved to graduate at 
the present day into each other, it would be a remarkable case of variation ; and I for 
one should be as much pleased as surprised at the fact, for these two forms certainly 
differ from each other more than do most species of the genus Orchis.” He goes on 
to say that, as soon as he had examined the Lesser Butterfly Orchis, he felt convinced 
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