Sa. 
aa: 
Flowers resupinate, i.e. lateral sepals and lip lowermost 
Bs a ee oe eee ere ee rarer. tana air eee 8 
Lateral sepals in natural position connivent with dorsal 
sepal to tip, but free between themselves to middle, form- 
ing a slanted, eye-like opening on top of flower 
ee ep aa hehe ies bee BSS eee Andreettaea 
Pl tatee sepals dee fee At Tip ss seu cduaculesteewns 7 
Sepals ringent; lateral sepals with cushion-like thickening 
at tip; petals adnate to base of column; lip of simple con- 
struction, entire in front, commonly arcuate 
oe ee See eee eer re ere ere Scaphosepalum 
Dorsal sepal at a right angle with the lateral sepals; petals 
adnate laterally near apex of the long, channelled column- 
foot; lip intricately sculptured, 2-lobed in front, basally 
with an overhanging, large, fleshy callus ... Acostaea 
All three sepals connate at tip, forming a window-like 
opening at least on one side between dorsal and a lateral 
SONSD us cnacdennned nee exes tees does Cryptophoranthus 
All three sepals free at apex, if connivent, is due to imper- 
fect SePAraulOn 11 AINNCSIS. vsncsehs sce ncexons eens 9 
Dorsal sepal variously connate with lateral sepals 10 
Dorsal sepal free from lateral sepals ............ 19 
Stigmata 2, terminal, one on each side of rostellum 
i ee ne een ee ee er eee er ee Stelis 
Stigma |, on top or face of column under rostellum_ I! 
Sepals united into a 3-lobed synsepal, i.e. lateral sepals 
free from one another almost to base, but highly connate 
Witt 0fsal Stil -c.cioscsatesesnauea dd Physothallis 
Sepals never form a 3-lobed synsepal ........... 12 
Rostellum arrect; anther dorsally reclined; lip sensitively 
hinged under free tip of column-foot Porroglossum 
Rostellum porrect or recurved; anther incumbent; lip 
non-sensitively articulate at tip of column-foot ... 13 
Petals adnate laterally to column-foot; lateral sepals with 
a thickened fold or transverse callus ..... Dryadella 
Petals adnate at base of column; lateral sepals without a 
thickened fold or transverse callus .............. 14 
Lip segmented into a hypochile and epichile; petals 
crested or calliferous at apex .............. Dracula 
171 
