186 
DI@CIA.—PENTANDRIA.—OCTANDRIA.—ENNEANDRIA. 
IV. PENTANDRIA. 
HUMULUS. 
H. Lupulus, Sm. Compend. p. 149. E. B. t. 427. 
Hab. Hedges. In hedges between Cullenagh and Stradbally, and near Nenagh. 
In the south Isles of Arran among the limestone rocks, producing excel- 
lent hops in October, 1805. 
Vv. OCTANDRIA. 
POPULUS. 
P. alba, Sm. Compend. p. 150. E. B. t. 1618. 
Hab. Natural woods near Blarney, county of Cork; Mr. Drummond. 
P. tremula (Aspen), Sm. Compend. p. 150. E. B. t. 1909. 
Hab. Natural woods near Blarney; Mr. Drummond. 
P. nigra, Sm. Compend. p. 150. E. B. t. 1910. 
Hab. Common in plantations. Scarcely indigenous. 
RHODIOLA. 
R. rosea, Sm. Compend. p. 150. E. B. t. 508. 
Hab. Cliffs on Hungey hill; Miss Hutchins. Island of Rathlin; Mr. Templeton. 
Cliffs on Magillycuddy’s-reeks and on Brandon mountain, county of Kerry ; 
also in the largest south Island of Arran. 
VI. ENNEANDRIA. 
MERCURIALIS. 
M. annua, Sm. Compend. p. 150. E. B. t. 559. 
Hab. Waste places near Dublin, not uncommon. 
HYDROCHARIS. 
H. Morsus-rane, Sm. Compend. p. 150. E. B. t. 808. 
Hab. In bog pits near Balruddery; Dr. Scott. Bog of Curragha, and in drains in 
a marsh, by the river Fergus, a little above the bridge at Ennis. 
