192 MONOCOTYLEDONS. FLUVIALE3. Ituppia. 



4. TYPHA. 



Flowers collected into long cylindrical very dense spikes, which 

 are staminiferous or pistillif'erous. Barren Fl. Perianth 0. 

 Slam. 3 together upon a chaffy or hairy receptacle, and united 

 below into one common filament. Fertile Fl. Perianth 0. 

 Achevium pedicellate, surrounded at its base with hairs re- 

 sembling a pappus. 



1 . T. latij'olia, leaves linear nearly plane, sterile and fertile 

 spikes close together, p. 259. — Lakes. 



2. 'l\ avgiistijolia, leaves linear convex below, sterile and fertile 

 spikes a little distant from each other, p. 259. — Lakes. 



Order XVL JUNCAGINE.^. Rich. 



Perianth uniform, rarely none, not petaloid. Stam. hypogynous. 

 Ovaries superior. Ovules solitary, or two approximated at 

 their base, erect. Pericarps indehiscent. Emhryo without 

 albumen, having the same direction as the seed', with a late- 

 ral clij't for the emission of the plumule. — Rigid herbs with 

 narrow radical leaves. Flowers spiked, not coloured. Rich. 



1. TRIGLOCHIN. 



Perianth of 6 leaves, deciduous, the leaflets concave, 3 interior 

 ones inserted higher up. Stam. 6, very short. Anthers with 

 their anterior side turned outward, subsessile. Ovaries 3 — G, 

 one-seeded. Styles short. Stigmas adnate. Caps. 3 — 6, 

 valveless. Seeds erect. Br. 



1. Tr. palu^tre, fruit 3-ceIled nearly linear, p. 115. — Marshes. 



2. Tr. marilimum, fruit 6-cclled ovate, p. 1 15. — Salt marshes. 



OuDEii XVII. FLUVIALES. Hick. 



{Part of Naiades. Juss.) 



Floivers mnsQ\ua\ or bisexual. Ovary 1 or more, superior. Seed 

 solitarv, pendulous, or suspended. Embryo without albumen 

 having a contrary direction to the seeds, \v\th a lateral clejt 

 for the emission of the plumule. — Floating hubs with very 

 vascular leaves and stems. Floivers inconspicuous. 



1. RUPPIA. 



Flowers 2, perfect, on a spadix arising from the sheathing bases 

 of the leaves. Stam. 4, sessile. Ovaries 4. Perianth 0. 

 Drupes 4, pedicellate, their nuts 1 -seeded, 



1. R. maritima. p. 59. — Marine ditches. 



