S8 GYNANDRIA— MONANDRIA. Listera. 



Ophris. Tourn. t. 250. 



Nidus avis. Ibid. 



Cal. superior, of 3 ovate, concave, spreading, parmanent, 

 equal leaves. Pet. 2, lanceolate, spreading, nearly as 

 long. Nect. without a spur, much longer than the pe- 

 tals, dependent, two- or four-lobed ; slightly concave at 

 the base within the calyx ; disk marked with a longitu- 

 dinal central furrow, producing honey, ylnth. oblong, 

 parallel to the stigma, to which it is fixed behind by its 

 base, of 2 close, parallel, linear cells, which deposit the 

 powdery masses of pollen upon the upper lip of the 

 stigma. Germ, obovate, or roundish, angular. Stjjie very 

 short, cylindrical, not bordered. Stigma in front, of 2 

 unequal, flat, parallel lips ; the lowermost rounded, very 

 short. Caps, elliptic-oblong, obtuse, angular, ribbed. 

 Seeds minute, tunicated. 



Root of numerous clustered fibres. Leaves two, about the 

 middle of the stetn ; sometimes wanting. Fl. pale or 

 greenish, scentless, in a long upright cluster^ with a small 

 bractea under each partial stalk. 



The name commemorates Dr. Martin Lister, contemporary 

 with Ray, best known as a conchologist and entomologist. 



1. L. ovata. Common Twayblade. 



Leaves elliptical, opposite. Nectary with two linear-oblong, 

 nearly parallel, lobes. Column with a posterior hood. 



L. ovata. Br. as above, 201. Comp. ed. 4. 144. Forst. Tonbr. 100. 



Hook. Scot. 253. 

 Ophrvs ovata. Linn. Sp. PI. 1340. FL Br. 932. Engl. Bat. v. 22. 



t. 1548. Curt. Lond.fasc. 3. t. 60. Fl. Dan. t. 137. 

 Ophris. Fnchs. Hist. 566./. 7c. 325./. Matth. Falgr.v. 2. 565./. 



Camer. Epit. 943./. Dalech. Hist. 1261./. 

 O. bifolia. Bauh. Pin. 87. Ger. Em. 402. /. Rudb. Elys. v. 2. 226. 



/ 1 J also trifolia/ 2. Segu. Veron. v. 2. 138. 

 Epipactis n. 1291. Hall. Hist. v. 2. 150. t. 37. 

 E. ovata. Sw. Orch. 66. M'illd. Sp. PI. v. 4. 87. 

 Bifolium. Lob. Ic. 302./. 

 B. majus, sen Ophris major quibusdam. Raii Syn. 385. Bauh. 



Hist. V. 3. p. 2. 533./ 

 Pseudo-orchis, Bifolium. Dod. Pempt. 242./. 

 Perfoliata mascula et foemina. Brunf. Herb. 182, 183././. 



In groves and thickets, meadows and pastures. 



Perennial. June. 



Root of numerous, long, slender, cylindrical, smooth radicles, con- 



