ORCHID ACEAE. 115 



A very large cosmopolitan family of plants, represented in this State by 19 genera, all 

 of which are terrestrial. Of these local genera, Dipodium (Text-fig 31. A.) represents 

 the tribe Vandeae, all the rest being members of the Neottieae. 



The following terms, not included in the general glossary, are used in the description 

 of the Orchids : antero -lateral, anterior and at the side ; cauda, a tail-like appendage ; 

 caudate, furnished with a cauda ; chelate, shaped like a lobster's claw ; crescentic, 

 crescent-shaped ; cusp, a gradually attenuated point ; cuspidate, terminating in a cusp ; 

 dorsum, the back of an organ ; falco -lanceolate, falcate and lanceolate ; filamentous, fili- 

 form, thread-like ; fimbriate, fringed ; fistula, the opening in a hollow leaf through 

 which the stem emerges ; incumbent, leaning upon another organ ; inturned, incurved ; 

 labellar, relating to the labellum ; lamellar, lamellatz, laminate, composed of thin layers ; 

 lobulate, divided into small lobes ; mammillary, nipple-shaped ; multipartite, deeply cut 

 into many divisions ; patent, spreading ; quadrate, square or nearly so ; retracted, 

 turned backwards ; retuse, with an obtuse summit, or tip, the centre of which is 

 depressed ; rhombo-cuneate, rhomboid in the upper part, cuneate below ; rosulate, 

 leaves arranged in a radical rosette ; rufous, brownish red ; scaphoid, boat-shaped 

 semiovate, ovate on one side only ; semiterete, plano-convex ; sigmoid, S-shaped ; stig- 

 matic-plate, a vertical plate, in front of or below the anther, bearing the stigma and 

 rostellum, in Thelymitra, Diuris, and other genera. 



The following reference -lettering is used in the plates and text -figures which illustrate 

 this family : — 



d.s., dorsal sepal. h., hood. 



l.s., lateral sepal. w., wing of column. 



p., petal. st., stigma. 



I., labellum. r., rostellum. 



rah, callus or calli. g., gland or viscid disk of the rostellum. 



c, column. p.m., pollen-mass or pollinium. 



a., anther. ov., ovary. 



ap., appendage. 



Leaves reduced to scales or bracts. 



Flowers large, spotted, white or pink ; pollinia waxy. . . . Dipodium 1. 

 Flowers minute, reversed, greenish or purple ; pollinia 



sectile Prasophyllum 5. 



Leaf solitary, quite glabrous.* 



Leaf elongated ; usually channelled ; flowers solitary 

 or racemose ; sepals broad, often petaloid. 



Labellum densely beset with long hairs Calochilus 2. 



Labellum smooth, very similar to the other perianth- 

 segments Thelymitra 3. 



Leaf leek-like ; flowers usually in terminal spike or 

 raceme, on short pedicels. 



Flowers very small, spicate, green Microtis 4. 



Flowers of variable size, reversed, green to purple Prasophyllum 5. 



Leaf linear or narrow -lanceolate ; flowers brownish, 



reversed Caleana 6. 



Leaf nearly as wide as long, at or near the base. 



Leaf ovate to orbicular-cordate ; flower single, large 

 and purplish, close to leaf, galeate, lateral sepals and 



petals vestigial Corysanthes 7 



Flowers single or racemose, rather small, not close to leaf ; 

 labellum smooth with 2 callosities at the base, un- 

 divided. 



Leaf red underneath ; labellum acutely triangular ; 



plant very slender Acianthus 8. 



Leaf green underneath ; labellum oblong, rather 



blunt ; plant very slender Cyrtostylis 9. 



Flowers single or racemose, of large or medium size ; 



labellum with calli hairs or fringe on lamina or 



margin 



Plant stout, fleshy ; flowers large, purplish ; sepals 



and petals well developed ; labellum 3-lobed, with 



few sessile calli, fringed at tip Lyperanthtjs 10. 



Plant slender ; labellum densely hairy ; sepals petaloid Eriochilus 11. 

 Plant slender ; labellum wider than long, smooth, 



anterior margin toothed, or fringed Leptoceras 12. 



* Caladenia Menziesii frequently has glabrous leaves, but for other reasons is not included in 



this section. 



