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 perforation, Lin. S. P. 182. 
Peltopis perfoliata, Rajinesque in Journ. de Phys. 1819. 
P. 38. Fam. II.* 7.* LEMNADEfE. Miscellanearum 
sectio , Linnaeus. Naiadum pars, Jussieu. 
Hydrocharidum pars, Jussieu. Hydro - 
charidilus affines , Brown. 
Plowers spathaceous, on a spadix, anthers and pistills 
separate. Spadix 2-flowered ; spalhce hoodliked, 1-leafed; 
perigonium 0 ; 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-celled ; 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. Three-lohed duck-meat. 
Roots solitary ; leaves elliptical, lanceolate, narrow at 
bottom, sinuated at the tip. 
Lenticularia aquatica trisulca, Raii Syn. 129, 3. 
Hederula aquatica, Ger. em. 830. 
Ranunculus hederaceus aquaticus, 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 paluslris, Raii Syn. 129, 1 ; Ger. em. 829. 
Lens palustris seu aquatica vulgaris, Park. 1262. 
Lemna minor, Lin, S. P. 1376, 
Cqrnmon duck-meat. 
On ditches and stagnant waters; annual; June and July. 
