Victorian Plants. 263 



Leaves from ovate- to orbicular-cordate. 



Beset with rather rigid hairlets ; leaves mostly opposite, 

 rather short, serrulated ; bracts scattered ; flowers soli- 

 tary within each bract; fruit pale, globular-quadrangular, 

 wrinkled and rough. H. teucrioides. 



1207. Bracts mostly leaf-like. 



Alpine ; slightly rough ; leaves mostly opposite, rather 

 short, almost sessile, from lanceolar- to cordate-ovate, 

 serrulated ; bracts opposite or scattered ; flowers solitary, 

 sessile within each bract ; stigmas beset with minute 

 hairlets; fruit very small, pale, globular-ovate, faintly 

 eight-streaked, otherwise smooth. H. depressa. 



Bracts minute. 



Glabrous ; leaves mostly opposite, orbicular-cordate, closely 

 serrulated ; flowers solitary within each bract, very 

 small ; stigmas beset with very minute soon evanescent 

 hairlets ; fruit quite minute, pale, globular, streaked by 

 eight longitudinal prominent lines, otherwise smooth. 



H. micrantha. 



CAX.X.XTRXCHX:. 



1208. Mostly submerged. 



Upper or rarely all leaves from spatular to obovate, lower 

 leaves linear ; stamen through absence of calyx basal 

 (hypogynous) ; bracteoles curved ; styles when short 

 remaining erect, when long much reflexed ; fruitlets very 

 small, broadly or narrowly margined, connate towards 

 their inner angle. C. verna. 



Mostly creeping. 



Leaves all nearly rhomboid ; stamen through absence of 

 calyx basal; styles short, erect; fruitlets four, very small, 

 towards their inner angle connate into an obcordate- 

 orbicular fruit, membraiiously margined. 



C. Muelleri. 



CERATOPHYLLUIVX. 



1209. Segments of leaves sharply denticulated. 



Stems and branches elongated ; flowers axillary, solitary, 

 sessile, the staminate and pistillate flowers distinct, but 

 on the same plant ; stamens through absence of calyx 

 basal, without any conspicuous filaments ; fruit often 

 armed with two almost basal prickles or short ex- 

 crescences ; cotyledons deeply bilobed. 



C. demersum. 



