164 FLORA OF SOUTH AUSTRALIA. 
Prasophyllum. 
I, Labellum sessile. Usually tall and robust. 
Lateral sepals connate to about the middle; fruit narrow. 
Labellum straight, its marginal portion narrow hardly 
wider than the callous portion; flowers compara- 
tively large, yellowish-green. Tall and very robust 
Labellum recurved from the middle, its thin white 
crisp portion much exceeding the callous portion; 
petals greenish, dark-streaked, pointed me 
Lateral sepals disconnected; fruit somewhat obliquely 
swollen. 
Labellum as in P. elatum; flowers dark-coloured or 
greenish .. 
Labellum as in P. australe; petals rather narrow, 
nearly blunt 
11. Labellum stalked. Dwarf, slender. 
Labellum acute, reddish, slightly denticulate; flowers 
very small, dark-reddish; petals narrow-lanceolate... 
Labellum rather blunt, extremely short; lateral sepals 
bulging at the base; flowers very small, dark-purplish 
and somewhat greenish; petals deltoid-lanceolate ... 
Spiranthes. 
Flowers red, the labellum white, numerous, often hairy 
Microtis. 
Rather tall and stout; flowers light-green, very small; 
lateral sepals recurved; labellum with a _ tubercle 
near the end ae >t BA os ; 
Dwarf, very slender; flowers yellowish-green, minute, 
drying black; lateral sepals spreading (MV. atrata)... 
Corysanthes. 
Dwarf; leaf one, orbicular-cordate; flower large, dark- 
purple 2h si 
Pterostylis. 
1. Lower sepals erect. Hood green. 
Leaves in a radical rosette. 
Labellum shortly and broadly bilobed; leaves small, 
ovate. Dwarf ... 
Labellum entire. Flowers about 4 inch; lobes of the 
lower lip separate by a wide sinus with an inflexed 
tooth. 
Labellum linear elliptical ; 
Dwarf 
leaves orbicular. 
elatum 
australe 
fuscum 
patens 
despectans 
nigricans 
australis 
porrifolia 
minutiflora 
pruinosa 
concinna 
nana 
