146 VASCULAR PLANTS. 



aments of $ flowers very short. Perigonium 

 surrounded by 3 scales. Pericarp indehiscent. 



2f. 

 2. Typha, Tournef. 



Flowers in a club-shaped, continuous spike. 

 $ flowers: filaments filiform. ? flowers: ovaries 

 surrounded by bristles. Pericarp dehiscent. 



U 



SERIES m. HEL0BL3E. 



Aquatics. Types generally not ternary. Seed 

 nearly without endosperm. Embryo with very 

 pronounced radicle. 



ORDER XXXVn. POLYCARPICffi. 



Ovaries 3 — oo. Endosperm 0. 



Family CII. Alismacese. 



Calyx 3-sepalous. Corolla 3-petalous. Sta- 

 mens 6 — oo. Ovaries 3 — oo, with terminal 

 styles, and ventral placentation. Carpidia dry, 

 indehiscent. Lamina of leaves nervose. 



1. Alisma, L. 



Flowers £ . Calyx herbaceous. Corolla pet- 

 aloid. Ovaries oo, 1-ovulate. Akenes oo, ver- 

 ticillate. 



If. aquatic, scapigerous; inflorescence verti- 

 cillate, paniculate. 



