1917] Metcalf & Griscom,— Rare New York State Plants 31 
trated to the ground at any point. No less than five species of Botry- 
chium were found here; the rare B. simplex, B. ramosum, B. angusti- 
segmentum, B. obliquum var. dissectum, and B. virginianum. Except 
a few Lycopodiums, most of the undergrowth was composed of orchids. 
Habenaria bracteata was the least common; Corallorrhiza maculata 
was the most abundant. Habenaria flava was frequent. Serapias 
Helleborine was common, growing luxuriantly with large and highly 
colored flowers. The best find, however, was the dainty Pogonia 
trianthophora. Two patches were found, about four hundred plants 
in all, in each case growing under yellow birch. Nearly all the flowers 
oddly enough, were pure white. 
(6). ARBOR-VITAE SwAMPs. These swamps of which there are two 
in the region, had considerable sphagnum in them, but the flora was so ` 
different from the ordinary bog flora, that it must be treated sepa- 
rately. The most striking feature was the great abundance of 
Cypripedium hirsutum. Many thousands of these plants were in full 
bloom on July 3rd, 1916, making a sight never to be forgotten. Erio- 
phorum viridi-carinatum was abundant. Habenaria clavellata, Pyrola 
asarifolia var. incarnata, and the rare Valeriana uliginosa were com- 
mon; Triglochin palustris was common in one place only. Chiogenes 
hispidula and Pogonia ophioglossoides were frequent. A very little 
Scirpus hudsonianus and Habenaria hyperborea were collected. A few 
plants of the rare Pogonia trianthophora were found on hummocks 
under the arbor-vitae. At this station the flowers were pink. 
(7). SpHAGNUM BOGS. Besides the familiar bog heaths, several 
plants deserve mention. The borders were covered with a dense 
growth of Cypripedium acaule and Smilacina trifolia. White flowers 
of the former were by no means rare. Habenaria clavellata was 
abundant. Bartonia virginica, Carex trisperma, and C. paupercula 
var. irrigua were common. H. blephariglottis was frequent. Three 
plants of Microstylis unifolia were detected by Prof. Wright. 
Out in the bogs proper the season witnessed an interesting succession 
of rare plants. In June Eriophorum callitrix filled all open places 
with occasional colonies of Scheuchzeria palustris. Arethusa bulbosa 
was found in one place only. Under the shade of the Vacciniums, 
Pogonia verticillata was common, though very few plants produced 
flowers. The best find, however, was Listera australis, which turned 
out to be common in two of the bogs. We had not even considered 
it as a possibility. The junior author, in proceeding from one open 
