ADDITIONS AND CORRECTIONS. 



Page 10 & 11. Remove athyrium regium, and A. den- 

 tatum, into the genus cyclopteris, changing the gender of 

 the adjectives. 



P. 35. Potamogiton perfoliation, Lin. S. P. 182. 



Peltopis perfoliata, RaJinesqueinJourn.de Phys. 1819. 



P. 38. Fara. II.* 7.* LEMNADEiE. Miscellanearum 

 sectio, Linnseus. Naiadum pars, Jussieu. 

 Hydrocharidum pars, Jussieu. Hydro- 

 charidihus affines. Brown. 

 Flojvers spathaceous, on a spadix, anthers and pistills 

 separate. Spadix 2-B.owered; spathce hoodhked, 1-leafed; 

 perigonium ; stamens 2 or more ; anthers turned outwards ; 

 ovarium free, solitary, 1 or many-seeded; ovules upright; 

 style 0; stigma 1 ; pericarp not opening, utricular or cap- 

 sular; corculum axile; perisperm fleshy ; radicle below. — 

 Plants herbaceous, floating, stemless ; roots from the lower 

 surface of the leaves, ending in a conical appendage; leaves 

 simple or rosaceous, proliferous from the margin, sheathing 

 at the base ; flowers lateral, in a marginal slit. 



28.* LEMNA. Theophrastus. Duck-meat. 



Spathe pitchershape, membranaceous, 2-flowered ; Male 

 above; stamens 2; anthers 2-ce\\ed; cells roundish; Fem. 

 below; ovary roundish, compressed; style short, thick; 

 stigma flat, expanded ; utricle oblong, compressed, nicked, 

 1 to 5-seeded. — Leaves proliferous. 



1. Lemna trisulca. Thret-loled duck-meat. 

 Roots solitary ; leaves elliptical, lanceolate, narrow at 



bottom, sinuated at the tip. 



Lenticulaiia aquatica trisulca. Rail Syn. 129,3. 

 Hederula aquatica, Ger. em. 830. 

 Ranunculus iiederaceus aquaticns, Park, 1216, 

 Lemna trisulca, Lin. S. P. 1376. 



In ditches and ponds ; annual; June. 

 Leaves pale green, pellucid, forming by prolification a 

 triplipinnate frons. 



2. Lemna minor. Small duck-meat. 

 Roots solitary ; leaves ovate, sessile, flattish on both sides. 



Lens palustris, Rati Syn. 129, 1 ; Ger. em. 829. 

 Lens palustris sew aquatica vulgaris. Park. 1262. 

 Lemna minor, Lin. S. P. 1376. 



Common duck-meat. 



On ditches and stagnant waters ; annual ; June and July. 



