GENERA AND SPECIES. 
Leaves developed. Terrestrial. Pollen granular. 
a. United stamens and style (column) short. 
Flowers racemose, sepals broad and petal-like. 
Flowers reguar, the labellum quite similar to the 
two other petals a ; 
Labellum densely hairy; dorsal Satan concave 
petals smaller ee 
Flowers racemose ; lateral sepals narrow- iene a long; 
labellum 3- lobed, at or near its base. 
Dorsal sepal erect or eee nee ; lateral Maggs 
long ae eve 
Dorsal sepal concave, tered over Pike sbindee 
lateral petals minute 
Flowers racemose, turned upside down ; Sails narrow, 
greenish. 
Leaves flat broad ; flowers large 
Leaf cylindrical; flowers often small; labellum 
callously thickened, usually with a broad thin 
margin i ae ee ie ; 
Flowers spicate, small. 
Flowers spirally arranged ; leaves narrow . 
Flowers green ; ABBA - sepal 
concave 
leaf umes 
Flower singly terminal ; labell um nb td at ie jndobil 
b. Column elongate ; leaves rarely more than one. 
Leaves several. Dorsal sepal hooded connate with the 
lateral petals; labellum stalked ; lower i much 
united forming a ‘‘lower lip” 
Leaf one only; labellum sessile; dorsal sabi dicots 
nected. 
Labellum smooth, with two adnate callosities at 
the base. 
Lateral petals much shorter than the yvats. 
Leaf cordate : 
Lateral petals about as ie as the > sepals 
Leaf cordate Bs) 
Labellum smooth, with 1 or 2 ae ate processes 
erect against the column; flowers almost regular. 
Leaf oblong sit 
Labellum papillary, thick. Leaf Sova He 
Labellum densely hairy, very convex. Leaf narrow 
Labellum with glandular hairsin rows. Leaf narrow 
L 
168 
Thelymitra 
Calochilus 
Diuris 
Orthoceras 
Cryptostylis 
Prasophyllum 
Spiranthes 
Microtis 
Corysanthes 
Pterostylis 
Acianthus 
Cyrtostylis 
Glossodia 
Lyperanthus 
Eriochilus 
Caladenia 
