Ixii FLORA OF HABEAS. 



corolline ; flowers 2-sexual or monoecious, conspicuous in 



umbellate or panicled whorls CLXX. ALISMACEAE. 



Perianth 0, or reduced to scales or bristles ; or if perianth 

 herbaceous or hyaline, then the segments either not regularly 

 3-merous, or if, rarely, 6 in 2 rows, then erect, aquatic weeds 

 with small flowers in simple racemes or spikes and fleshy, not 

 horseshoe-shaped embryo : 



Inflorescence of many- or few-flowered spadices or spikes or 

 racemes ; or if flowers solitary, then not in the axils of 

 modified, glumaceous bracts : 



Flowers on a spadix subtended and usually covered by a 

 more or less modified spathe ; terrestrial trees or shrubs, 

 sometimes scandent, sometimes marsh plants, very rarely 

 free floating : 



Shrubs or trees with long, ensiform, spinulose leaves 

 arranged in 3-farious spirals ; often with aerial roots ; 

 flowers dioecious, crowded and catkin-like ; spadix 

 often branched ; spathe little modified, sometimes 



coloured ; perianth CLXV. PANDANACEAE. 



Herbs or shrubs, sometimes climbing by aerial roots ; 

 seldom marsh plants, very rarely free floating ; flowers 

 2-sexual or monoecious, rarely dioecious and then 

 tuberous-rooted with much modified spathes ; spadix 

 simple ; leaves not in spirals rarely spinous ; perianth 



or of scales CLXVII. ARACEAE. 



Flowers not on a spadix ; or if on a spadix, then not 

 covered by a spathe or spathaceous bracts ; aquatic or 

 marsh plants, sometimes free-floating : 



Free-floating minute, lenticular or granular plants 

 with 1 or more roots that do not enter the soil ; flowers 

 very minute from the margins or the upper side of a 



frond ; perianth CLXVIII. LEMNACEAE. 



Fixed herbs with erect, scapigerous or elongate 

 floating or submerged leafy stems, arising from a 

 usually creeping stock rooted in the soil ; perianth 

 present or : 



Perianth of filiform bristles or membranous scales ; 

 rootstock creeping, emitting annual stems ; leaves 

 elongate, linear; flowers on cylindric or globose 

 1 -sexual, superposed spadices; ovary 1 -celled, borne 



on a hairy gynophore CLXVI. TYPHACEAE. 



Perianth 0, or of 1-4 herbaceous or hyaline segments, 



