DIaND. MONOG. DIGYN. 1 I 



2. L.7}iinor (lesser Duclnveed), fronds nearly ovate compressed, 

 roots solitary. Lighif. p. 537. E. B. t. 1095. 



Hab. Stagnant waters, common, i^/. July. 0. 



About a line or a line and a half long ; of a rather thick, succulent 

 and firm texture, slightly convex beneath. The most abundant of 

 all, increasing prodigiously by Gemmce; rare in fr. The young 

 fronds constitute the L. arhiza of French authors. 



3. h.polyrhiza {greater Duckweed), fronds obovato-rotundate 

 comjjressed, roots numerousc lustered. Light/, p. 538. E.B. 

 i. 2458. 



Hab. Stagnant waters. Flowers unknown in Britain. Q. 



The largest species of all, half an inch in length and nearly as broad, 

 succulent, firm and faintly striated ; a little convex beneath, where 

 it is especially of a purple colour. Roots numerous from one point. 



4. h. gibba (gibbous Duckweed), fronds obovate nearly plane 

 above hemisphaerical beneath, roots solitary. E. B. t. 1233. 



Hab. Stagnant waters, rare. Lochend at Duddingston Loch_, Edinb., 

 MaugJi. f/.June. ©. 



Size of L. minor, but readily distinguished by the gibbous or even he- 

 misphierical underside, which is pellucid, beautifully cellular and 

 appearing reticulated } upper surface plane, green, compact. 



10. CLADIUM. 



1. C. Mariscus (prickly Bog-rusk), panicle much divided leafy, 

 spikelets capitate-glomerate, culm rounded leafy, margins of 

 the leaves and keels rough. Br. Prodr. p. 236. E. B. t. 950 

 (Schoenus Mariscus). 



Hab. Bog of Restenat, near Forfar, G. Don,, but now destroyed as 

 well as Erloph. alp, by the draining of the moss, D. Don. Fl. July, 

 August, % . 



Habit very difterent from Schoenus, as is the fruit, being a nut with a 

 remarkably thick shell, whose brown and glossy epicarp or external 

 skin separates readily from the osseous part. Plant 3 — 5 feet high, 

 leafy 5 leaves remarkably rough, almost prickly at the edge and 

 keel. Glumes ovate, brown, ti — 7 in an ovate spikelet ; inner ones 

 longest, two innermost bearing flowers. Stam. two. Stigmas 

 three. One flower becomes perfect and produces a fruit almost as 

 large "as the spikelet. 



2. DIGYNIA. 



11. ANTHOXANTHUM*. 



1. A. odoratum (siveet-scented vernal Grass), panicle spiked ob- 

 long, flowers upon short footstalks and longer than the awn. 

 Lightf. p. 81. E.B. t.647. 



Hab. Meadows and pastures. Fl. May, June. If. . 



* A Grass, removed from its affinities in consequence of the number of 

 the stamens. 



