Victorian Plants. 91 



Labellum unprovided with glands and callosities, but 

 producing one or two elongated appendages. 



Younger tuber distant from the older; leaf very much longer 

 than broad; empty bract one; stalklets very short; flowers 

 one or two ; calyx-lobes and lateral petals much alike ; 

 labellum often downy towards the base ; united stamens 

 and style dilated ; pollen powdery. Glossodia. 1798 



449. Calyx-lobes and petals quite disconnected. 



Younger tuber distant from the older ; leaves always two, 

 basal, considerably longer than broad, membranous ; 

 flower one ; empty bract none ; stalklet sometimes very 

 much elongated ; lower calyx-lobes narrow ; surface of 

 the labellum beset with tubercular callosities ; pollen 

 powdery. Chiloglottis. 1799 



Upper calyx-lobe broad, somewhat arched, downward 

 concave and connate with the lateral petals. 



Younger tuber close to the older ; leaves several, mem- 

 branous; flowers nearly always greenish, seldom somewhat 

 reddish or brownish ; lower calyx-lobes much connate ; 

 labellum narrow, basally either protracted or appendi- 

 culated, spontaneously jerking on touch, often enclosed ; 

 pollen powdery. Pterostylis. 1800 



HYDXtOCHARXDEAE. 



450. Flowers large. 



Freshwater-plants ; leaves large, broad, all basal, often 

 conspicuously stalked ; flowers singly enclosed in a calyx- 

 like often long stalked solitary involucre, the latter 

 formed of connate bracteoles ; calyx-lobes always three, 

 of herbaceous texture ; petals three, large ; stamens 

 and pistils in the same flowers ; stamens six or more ; 

 stigmas many; fruit succulent, large; seeds very numerous. 

 Figure 115. Ottelia. 1817 



Flowers small ... ... ... ... ... 451 



451. Pistillate flowers singly terminal on very long spirally 



twisted stalks. 



Freshwater -plant ; leaves all basal, much elongated, narrow, 

 membranous ; staminate and pistillate flowers distinct ; 

 the staminate flowers minute, crowded, short-stalked, 

 with one to three stamens, the pistillate flowers within 

 connate bracteoles ; petals absent ; stigmas three ; ovulary 

 one-celled ; fruit narrow ; seeds many. Vallisneria. 1818 



