90 Key to the System of 



445. Labellum papillular on the surface. 



Younger tube distant from the older ; leaf basal, cordate 

 and firm, or almost lanceolar and then not simultaneously 

 developed with the flowers ; some empty bracts on the 

 stem; flowers one or two or when few in a raceme-like 

 spike ; united stamens and style narrow ; pollen powdery. 



Lyperanthus. 1787 



Labellum almost or quite smooth ... ... ... 446 



446. Lateral petals much shorter than the calyx-lobes. 



Younger tuber close to the older; leaf basal, almost cordate, 

 membranous ; empty bracts none ; flowers one, two or 

 few ; stalklets very short or none ; labellum entire, with 

 two adnate callosities at the base; pollen powdery. 



Acianthus. 1788 



Lateral petals about as long as the calyx-lobes. 



Young tuber close to the older; leaf basal, cordate-orbicular, 

 membranous ; empty bracts none ; flowers one or two or 

 few; stalklets very short or none; calyx-lobes and lateral 

 petals narrow; labellum with two adnate callosities at 

 the base ; pollen powdery. Cyrtostylis. 1789 



447. Labellum densely beset on its surface with minute 



hairlets. 



Younger tuber close to the older; leaf often basal and small, 

 somewhat or considerably longer than broad ; empty 

 bracts none or rarely one ; flowers one or two or few, 

 seldom many; lower calyx-lobes dilated, petaloid ; pollen 

 powdery. Figure 113. Eriochilus. 1790 



Labellum beset on its surface with stalked glandules 

 or narrow callosities or when smooth provided with 

 two erect basal appendages ... ... ... ... 448 



448. Labellum beset with stalked and often also seriated 



glandules or callosities. 



Younger tuber usually close to the older ; leaf considerably 

 or very much longer than broad ; flowers one or two or 

 few ; stalklets generally conspicuous ; empty bracts 

 usually one only ; calyx-lobes and lateral petals often 

 similar to each other ; united stamens and style dilated ; 

 pollen powdery. Caladenia. 1791 



