Lemna.] pistiace^. 583 



at the opposite extremity from the hilum. — Floating frondose 

 plants, minute and usually lenticular, or icith large lobed fronds." — 

 Br. Fl. 



I. Lemna, Linn. Duckweed. 



" Spatha membranaceous, urceolate. Stamens 1 — 2^ distinct, 

 each bearing a 3-celled didymous anther (the cells bilocular ?). 

 Fruit ui'ticular. — Fronds without distinct stem or leaves, floating 

 on the surface of the tvater, and increasing, not only by seeds, but, 

 far more abundantly, by gemmae or buds, concealed in lateral clefts 

 of the parent frond, which, growing out on two opposite sides into 

 new plants, and these again producing offspring m the same way, 

 while still attached to their parent, present a most curious appear- 

 ance." — Br. Fl. 



1. L. triswZca, L. Ivy-leaved Duckweed. Fronds thin pellucid 

 elliptic-lanceolate caudate at one end at the other serrated, roots 

 solitary. E. Fl. i. p. 33. E. B. t. 926. Br. Fl. p. 464. Fl. 

 Dan. ix. t. 1586. 



In clear standing water, pools and ditches, but local. Ft. June, July. ©. 



E. Med. — Dilelies in Sandowu level, abundantly, very profusely in tbose imme- 

 diately around the fort. [Pond near the brick-kiln, Bembridge, A. G. More, Esq., 

 Edrs.] 



fV. Med. — Ditches in the marsh at Easton, Fl. Vect. 



2. L. polyrhiza, L. Greater Duckweed. Fronds opaque obo- 

 vato-rotundate somewhat convex beneath, roots numerous clus- 

 tered. E. Fl. i. p. 33. E. B. t. 2458. Br. Fl. p. 464. Fl. Dan. 

 ix. t. 1589. 



In clear still water, with the last species, and scarcely less local than it. Fl. 

 not yet seen in Britain. ©. 



E. Med. — Abundant in marsh-ditches between Yarbridge and Yaverland, as 

 well as in other parts of Sandown level. 



W. Med. — Ditches in the marsh at Freshwater gate. 



3. L. minqr, L. Lesser Duckweed. Fronds opaque nearly 

 ovate fiattish above and beneath, roots solitary. Sm. E. Fl. i. p. 

 32. E. B. t. 1095. Br. Fl. p. 464. Fl. Dan. ix. t. 1587. 



Abundant in stagnant water, ponds, ditches and plashes, whether clear or miry. 

 ^^.July. 0. 



4. L. gibba, L. Gibbous Duckweed. " Fronds obovate nearly 

 plane above hemispherical beneath." — Br. Fl. p. 464. E. B. t. 

 1233. Fl. Dan. ix. t. 1588. 



In ponds and ditches, but far rarer than any of the foregoing. Fl. June — 

 September. 0. 



W. Med. — In a small pond near Yafford farm, growing intermixed with L. 

 minor, 1845. 



