OXXVII. OECHiDE^. 1517 



Labellum nnfcuioulfite, the lamina peltate or produced beyond its 

 iusertion into a basal appendage. 



Dorsal sepal hoodshaped. Lateral sepals united at the base. Column 

 semiterete with an oblong stigma about the middle and 2-hatohet 

 shaped wings above it. Labellum with a basal appendage . . . .30. Pikhost^li;. 



Sepals and petals free. 



Labellum rather liroadly peltate. ColuiEn with a broad petal-like wing 

 its whole length '. . ^7. Cale.\na. 



Labellum hammer-shaped. Column with 1 or 2 pairs of narrow 



auricles 38. Drak.i^a. 



Labellum-lamina sessile or not produced beyond its insertion on the 

 claw. 



One ovate cordate leaf. Lateral sepals narrow. Petals short. 

 Labellum undivided without fringes or erect Calli, but two adnate 

 ones at the base ■. 39. Acianthus. 



One ovate or lanceolate leaf. Lateral sepals oblong, stipitate. 

 Labellum-lamina or middle lobe very convex and villous .... 40. Eeiochilus. 



One broad leaf. Lateral sepals and petals very narrow and spreading. 

 Labellum with 2 adnate oalli at the base continued in raised lines. 

 Column winged 41. Cyktostylis. 



One linear or oblong leaf. Lateral sepals as broad as or broader 

 than the petals. Labellum with raised calli or fringes variously 

 arranged. Column winged 42. Caladenia. 



One oblong or lanceolate leaf. Sepals and petals nearly equal, petal- 

 like and spreading. Labellum without calli or fringes except 1 or 2 

 linear olavate processes erect against the column 43. Glossoma. 



Flowers racemose. Sepals broad and petal-like. Dorsal sepal concave, 



petals much smaller, Labellum densely fringed on the surface . . 44. Calochilcs. 



Two oblong leaves. Lateral sepals narrower than the petals, 

 Labellum with raised calli or fringes. Column winged . . ... 45. Chilogloitis. 



SuBTMBK 5. Arethuseee. — Stem simiile, erect from an underr/round tnber. Anthers 

 opej'cnlar, incmnhent or siiberect. 



Sepals erect or spreading. Labellum undivided or 3-lobed. Column 

 elongate, not winged. Flowering stem leafy, or leafless with the leaf 

 produced afterwards 46. Pogonia. 



Sepals and petals united into a ventricose 5-lobed tube. Labellum 



undivided. Leafless herbs .47. Gasi'eodi.a. 



Sepals narrow, free. Labellum concave, saccate or shortly spurred at the 

 base. Column short. Leafless herbs 48. Epipogubi. 



Teibe IV. Ophrydese. — Anther l,posticous, erect, inclined or reflexed. Cells parallel or 

 diverginp, adnate to.the cohimn and often continuous with the rostellmn. Pollen-masses 1, 

 rarely 2 in each cell, granular, produced into short caudicles attached to a gland or to the rostellum. 

 Terrestrial lierbs. 



SuBTKiBE 1. Kabenariese. — Anther erect. Pollen-masses with their glands nalied or 

 partially included in a groove or fold of the rostellmn. 



Labellum spurred. Sepals equalling or exceeding the petals. Flowers 



spicate or racemose. Hostellum not elongated . . 49. Haeenaeia. 



Tribe V, Cypripedie^e. — Anthers 2, one on each side of the rostellum, sessile or stipitate. 

 Anther posticous. Pollen granular. Terrestrial herhs. 



Sepals, petals and labellum all similar. Anthers 2. Ovary 3-celled. 



Stem leafy. Panicles axillary 50. Apostasia. 



1. OBERONIA, Lindl. 



(After Oberort, King of the Fairies). 



Sepals free, nearly equal and erect, or ; the dorsal one smaller and reflexed. 

 Petals narrower or shorter than the sepals, Labellum sessile, concave, entire or 

 variously divided, often cushion-like or keeled at the base and usually embracing 

 the column. Column very short, terete, contracted at the base, the apex v?ith 

 angular margins. Anther terminal, lid-like. Pollen masses 4, waxy, closely 

 contiguous in pairs and often falling away in one mass, sometimes oblique and 

 unequal. — Epiphytical plants with very short or, in" species not Australian, 



Part V. L 



