3-10 
89. AROIDE.E. 
Suborder II. Arinece. 
3. Acorus Linn. 
1. A. Calamus (L.); scaj)e with a long leafy prolongation be- 
yond the spadix. — E. B. 356. — St. 5 — 6 feet high, resembling 
the 1., ensiform, flattened. Spadix completely covered by the 
flowers, 2 — 3 in. long, lateral. St. and 1. sweet-scented when 
crushed. — In water, rare; more common in Norf. and Sutir. 
P. VI. Sioeet-jiag. E. S. 
4. Arum Linn. 
1. A. maculatum (L.); 1. all radical hastate-sagittate green or 
spotted with j)urple, s])adix clubshaj)ed straight obtuse shorter 
than the spath. — E. B. 1298. — Root tuberous. L. with branch- 
ing veins. Spath large. Sjradix with ovaries at the base ; above 
them whorls of anth. ; above these a few filaments, probably 
abortive ovaries; club naked. Berries scarlet, remaining after 
the rest of the plant has disappeared. — Hedge-banks and thickets. 
P. TV. V. Cuckow-pint. 
Suborder III. Lemnea. 
5. Lemna Linn. Duckweed. 
1 . L. trisulca {h.); fronds thin pellucid elliptic-ZanceoZate tailed 
at one end serrated at the other, roots solitary. — E. B. 926. 
R. vii. 19. — Roots tipped with a sheath. Fronds half an in. long, 
])roliferous at right angles. “ Filaments recurved, filiform.” 
Schleid. Plants truly annual, producing geminffi 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. R. vii. 15. — Fronds 1 — 2 lines long, nearly 
flat beneath, of a compact texture. “ Filaments recurved, fili- 
form.” Schleid. — Stagnant water. A. VI. Vll. 
3. L. polyrrhiza (L.) ; fronds roundish-obovate compressed, 
roots numerous clustered. — E. B. 2458. R. vii. 17- Spirodela 
Schleid., Endl. — Fronds half an in. long, green above, piuq)le be- 
neath. “ F’ilaments narrowed below.” Schleid. — Stagnant w'ater. 
A. Fd. 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. R. vii. 16. 
Telmatophace Schleid., Endl. — Fronds 1 — 2 lines long, remark- 
ably gibbous and cellular beneath. “ Fdlaments recurved, chlated 
in the middle.” Schleid. See an excellent account of the germi- 
nation of this plant, by Mr. Wilson, in Bot, Misc. i. 145. t. 42. — 
Stagnant water. A. VI. — VIII. 
