193 GYNANBRIA. MONAKDRIA. 



612. POGONIA. Jnss, R. Brown. Arethusa. i. 



Petals 5, distinct, \vit!>out glands. Lip ses- 

 sik\ cucullate, internally crested. Pollen fari- 

 naceous. 



Roots fasciculated, the fibres simple and carnose: scapes 

 mostly bifoliate, l-flowered; leaves rarely approximating^ 

 \erticillately at tlie sunnmit of the scape; external petals 

 often very lon^ and linear, the 2 internal then shorter 

 and connivent; lip aliruptly alated from the bifte, the cen- 

 tre crested, terminaiinj,f in a simple dilated lobe with a 

 crenulated or eroded niare;in. (In P. opJuo^Iossoides the 

 petals are all nearlv of the same colour and magnitude.) 



?VEciE5. 1. P. opJiiogiosdoides. 2. divcincata. 3. rc?- 

 ticillatd. Obs. IJoot fasciculated, fibres simple and car- 

 nose. Scape about 12 inches high, terete, hrov/nisli, and 

 f<s in r. divnricnta slightly glaucous. Leaves terminal, 

 vc-rticillated in .I's, very smooth, with many nerves, ctn.e- 

 ate, ovaManceolatc, and somewhat ac\ite, 2 of the leaves 

 distinctly inferior. The 3 external petals linear, 2 to 

 2 and a half inches long- and channelled, colour gteen- 

 ish-brown; the 2 interior petals connivent and longer 

 than the lip, oblong, obtuse, paler than the outer pe- 

 tals, ami scarcely I third their length, internally niarked 

 villi 2 clevjited iines. Lip horizontal, c'lumieiled, ula'cd 

 from the base, and unconnected with the column, alated 

 iDargins inf^.ected or cucullate, terminating abruptly be- 

 low the dilated extremity of the lip; centre ()f the lip papii- 

 loselv crested; extrem.e limb smooth and dilated, broailei* 

 than long, pender.t, and undulated. Ccnitaliferous columa 

 shorter than the lip, incurved, solid and subclavate. An- 

 ti'.er 2 celled, hoi izontal, operculate, and persistent, un- 

 guiculately articulated behind, received into a lacunose 

 margined depression at tlie summit of the column. Pol- 

 len pulveru'.ent. P. medeohides, Pn. apjjcars to be merely 

 a variety of this <^pecie9. 



A North Ameiican genus. 



613. *TR1PH0RA. f Arethusa. Swart^. Willd. 

 Petals 5, distinct, equal and connivent, with- 

 out giands. Zip ungiiiculate, cucullate. Column 

 spathulate, coniplariate, and aptertius. Pollen 

 farinaceous. 



Root a pendulous oblong- tuber; stem many-flowered; 



f Derived by ellipsis from the trivial name trianthophoro'^i of 

 riukenet, Maht. 100. t. C48. f 6. 



