AROIDEJE POTAMEJE. 
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flowers, 2 — 3 in. long, lateral. St. and 1. sweet-scented when 
crushed. — In water, rare ; more common in Norf. and Stiff. 
P. VI. Sweet-flag. E. S. 
4f. Arum Linn. 
1. A. maculatum (L.) ; 1. all radical hastate-sagittate green or 
spotted with purple, spadix clubshaped straight obtuse shorter 
than the spath. — E. B. 1298. — -Root tuberous. L. with branch- 
ing veins. Spath large. Spadix with ovaries at the base ; 
above them whorls of anth. ; above these a few filaments, pro- 
bably abortive ovaries ; club naked. Berries scarlet, remaining 
after the rest of the plant has disappeared. — Hedge-banks and 
thickets. P. IV. V. Cuckow-pint. 
Suborder III. Lemneae. 
5. Lemna Linn. Duckweed. 
1. L. trisulca (L.) ; fronds thin pellucid elliptic-ZanceoZa/e tailed 
at one end serrated at the other, roots solitary. — E. B. 92C. — 
Roots tipped with a sheath. Fronds half an in. long, proliferous 
at right angles. " Filaments recurved, filiform." Schleid. Plants 
truly annual, producing gemmae which survive the winter as in 
the other species. — Stagnant water. A. VI. 
2. L. minor (L.) ; fronds obovate compressed opaque, roots 
solitary. — E. B. 1095. — Fronds 1 — 2 lines long, nearly flat be- 
neath, of a compact texture. " Filaments recurved, filiform." 
Schleid. — Stagnant water. A. VI. VII. 
3. L. polyrrhiza (L.) ; fronds roundish- obovate compressed, 
roots numerous clustered. — E. B. 2458. Spirodela Schleid., 
Endl. — Fronds half an in. long, green above, purple beneath. 
" Filaments narrowed below." Schleid. — Stagnant water. A. 
Fl. have not been seen in Britain. 
4. L. gibba (L.) ; fronds obovate nearly flat above hemispheri- 
cal and spongy beneath, roots solitary. — E. B. 1233. Telmato- 
phace Schleid., Endl. — Fronds 1 — 2 lines long, remarkably 
gibbous and cellular beneath. " Filaments recurved, dilated in 
the middle." Schleid. See an excellent account of the germina- 
tion of this plant, by Mr. Wilson, in Bot. Misc. i. 145. t. 42. — 
Stagnant water. A. VI. — VIII. 
Order LXXXIX. POTAMEtE. 
Fl. perfect or unisexual. Periauth inferior, 4-parted, or 0. 
Stam. definite, hypogynous. Ovaries 4, or 1, distinct, each 
with 1 ovule. Fr. drv, not bursting, 1 -seeded. Seed pendu- 
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