Habenaeia.] ORCHIDE^E. 395 



5. H. bifo'lia, Br. ; leaves 2, flowers whitish, lip linear-oblong entire, 



spur twice as long as the ovary. Butterfly Orchis. 



Wet meadows, woods, and heaths, N. to Boss ; ascends to 1,500 ft. in 

 N. England ; Ireland ; Channel Islands ; fl. June-Aug. — Tubers 2, ovoid. 

 Stem 6-18 in. Leaves rarely 3, lower 3-6 in., ovate or oblong, obtuse, 

 narrowed at the base ; upper small, lanceolate. Spike 4-6 in., lax-fld. ; 

 bracts equalling or exceeding the ovary, green. Flowers 1 in. from upper 

 sepal to tip of lip, tinged with green or yellow ; sepals subacute, dorsal 

 broad, lateral large ; petals small ; lip obtuse. — Distrib. Europe, N. Asia 

 (Arctic). — Very fragrant. The following sub-species are, according to 

 Darwin, distinct, and require different species of moths to fertilize them. 

 They vary in the position and distances of their anther-cells, but inter- 

 mediates occur. 



H. bif./lia proper ; lateral sepals narrow, spur slender spreading, anther-cells 

 parallel, caudicle short, gland oblong. Flatan'thera solstitia'lis, Bcenn. Fl. 

 June-July. 



Sub-sp. H. chxoran'tha, Bab. ; flowers usually larger, lateral sepals broader, 

 spur stout decurved more clavate, anther-cells more distant diverging, 

 caudicle longer attached by a short drum-like pedicel to the orbicular 

 gland ; fl. July-Aug. 



16. CYPRIPE'DIUM, L. Lady's Slipper. 



Rootstock creeping. Stem leafy at the base or upwards. Sepals and petals 

 spreading. Lip large, inflated. Column curved over and nearly closing 

 the small orifice of the lip, bearing a terminal dilated lobe (deformed 

 stamen), on each side of the base of which is a short antheriferous arm, 

 and below it a discoid pedicelled stigma. Anthers 2, partially 2-celled ; 

 pollen viscid, granular ; rostellum 0. Ovary straight. — Distrib. Trop. 

 and temp, regions ; species 40. — Etym. Kvirpi* and irodiop, Venus' Slipper. 



C. Cal'ceolus, L. ; bracts foliaceous, lip obovoid. 

 "Woods in limestone districts, Durham and York, very rare; fl. May. — 

 Pubescent. Stem 6-18 in. Leaves oblong, acuminate, ribbed. Flowers 

 1-2, odorous; bracts foliaceous; sepals red-brown, upper l-lj in., erect, 

 ovate-lanceolate, acuminate ; lateral narrower, usually connate, placed under 

 the lip; petals 1| in., linear; lip as long, pale yellow, obovoid, with a 

 rounded upturned end.— Distrib. Europe (Arctic) (excl. Turkey), 

 N. Asia. 



Order LXXVII. iRlDEiE. 



Perennial herbs ; rootstock tuberous, bulbous, or creeping, or a corm. 

 Leaves often equitant and ensiform. Flowers regular or not, 2-bracteate. 

 Ferianth superior, petaloid, of 6 imbricate segments in 2 series, often 

 twisted and persistent after flowering. Stamens 3, epigynous or inserted 

 on the outer perianth-segments ; anthers usually narrow, extrorse. 



