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'-is' high, i-3-leaved, not rarely with a 

 long-petioled basal leaf. Stem leaf or leaves 

 ^'-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, spur-less, 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 : 



