5 6 ORCHIDACEAE. VOL. I. 



i. Pogonia ophioglossoides (L.) Ker. Rose Pogonia. Snake-mouth. Fig. 1381. 



Arethusa ophioglossoides L. Sp. PI. 951. 1753. 



Pogonia ophioglossoides Ker, in Lindl. Bot. Reg. pi. 

 148. 1816. 



Stem 8'-i5' high, i-3-leaved, not rarely with a 

 long-petioled basal leaf. Stem leaf or leaves 

 i'-3' long, lanceolate or ovate, erect, bluntly 

 acute ; flowers fragrant, pale rose-color, slightly 

 nodding, large, solitary or occasionally in pairs, 

 subtended by a foliaceous bract; sepals and petals 

 about equal, elliptic or oval, 6"-io" long; lip 

 spatulate, free or somewhat appressed to the 

 column below, crested and fringed ; column much 

 shorter than the petals, thick, club-shaped. 



In meadows and swamps, Newfoundland to On- 

 tario, Minnesota, Florida, Kansas and Texas. Also 

 in Japan. Roots fibrous. Propagates by runners. 

 Adder's-mouth pogonia. June-July. 



2. Pogonia divaricata (L.) R. Br. Spread- 

 ing Pogonia. Fig. 1382. 



Arethusa divaricata L. Sp. PI. 951. 1753. 



Pogonia divaricata R. Br. in Ait. Hort. Kew. Ed. 2, 5 : 

 203. 1813. 



Stem i-2 high, bearing a leaf near the middle, 

 and a foliaceous bract near the flower. Leaf lanceo- 

 late, or narrowly elliptic, obtuse, clasping, 2'-^' 

 long; flower terminal, solitary, about i' long; sepals 

 linear, longer and narrower than the petals, diver- 

 ging, dark colored; petals flesh-color, lanceolate, 

 narrowed at the apex, lip as long as the petals, 

 3-lobed, crenulate or wavy-margined, greenish, 

 veined with purple, crested, but not bearded, the 

 upper lobe long. 



In swamps, southern New Jersey to Florida and Ala- 

 bama. Ascends to 4000 ft. in North Carolina. July. 



14. ISOTRIA Raf. Med. Rep. II. 5: 357. 1808. 



Low herbs with a rootstock and fibrous roots. Flowers terminal. Leaves 5 in whorl 

 near the top of the plant. Sepals and petals separate, ascending, the former generally longer 

 than the latter. Lip erect from the base of the column, crested, spurless, sessile. Anthers 

 and pollinia as in Pogonia. Capsule oblong, erect. [Greek, in equal threes.] 



Only the following species are known, the first being the type : 



