136 PETALOIDE.E. 



stricted in the centre, and tapering to a point at the top, the 

 edges turned in when open. Spike mostly concealed by the spathai, 

 the yellow or purple club-shaped top alone appearing ; beneath 

 the club is a row of filaments, then whorls of sessile anthers, and 

 at the base several circles of ovaries which, after the flowering, 

 ripen into scarlet berries, and remain after the upper part of the 

 plant has disappeared. Yery abundant. (E. B. 1. 1298.) P. 



OEI>. CUT. ORONTIACEJE. 



ACORUS. SWEET-SEDGKE. 



A. Calamus (common Sweet-Sedge.) On the banks of lakes 

 and streams. Leaves 2 or 3 feet long, linear, erect. Flower- 

 stem with a long leaf- like prolongation beyond the spike. Spike 

 2 or 3 inches long, lateral, covered completely by the yellowish- 

 green flowers. Whole plant when crushed sweet-scented. New 

 Cut, near Exeter, Haine banks, Exeter, Fl. D. Most probably 

 introduced. (E. B. t. 536.) P. vi. 



OED. CIY. PISTIACEJE. 



LEMNA. DUCKWEED. 



1. la. trisulca (ivy-leaved Duckweed?) On ponds and clear 

 stagnant waters. Fronds (or leaves) floating on the water, about 

 half an inch long, elliptic-lanceolate, minutely toothed at one 

 end and tailed at the other, having 2 young fronds springing 

 from opposite sides, and a single thread-like root from beneath. 

 Flowers proceeding from a fissure in the edge of the frond. 

 Exminster, Mr. Earle. (E. B. t. 926.) A. Yi. 



2. Ii. minor (lesser D.) On ponds and stagnant water. 

 Fronds about ^ of an inch long, roundish or broadly ovate, at- 

 tached together in patches and floating on the surface, with one 

 thread-like root under each. Flowers like the last. Yery conv 

 mon. (E. B. t. 1095.) A. YI. 



3. !. polyrrhiza (greater D.) Still waters. Fronds larger 

 than in the other species, about i an inch long and the same ^in 

 breadth, nearly orbicular, convex below ; the under surface and 

 the margin tinged with purple ; roots from each frond numerous. 

 Flowers never seen in England. Ponds at Teigngrace. Ilsing- 

 ton. Topsham. (E. B. t. 2458.) A. 



