Tetandria, 
4-9 
II. Aquifolium , Holly 'tree \ with ovate, acute, spi- 
nous leaves ; flowering in May, and common in hedges 
and woods. The holly is well known by its beautiful 
evergreen leaves and scarlet berries, which stand 
through the winter. The wood, which is susceptible 
of a fine polish, is employed by the cabinet-maker, 
and common birdlime is prepared from the bark. 
Potamogeton. Gen. char.-— Cal. none ; petals four ; 
no style ; four seeds. 
Pot. Natans, Broad-leaved Pondweed ; with the up- 
per leaves longish, ovate ; foot-stalked ; floating. Pe- 
rennial ; flowers in July, and is common in rivers and 
stagnant waters. 
Pot. Lucens, Shining Pondweed ; with ovate, lance- 
olate, plain leaves, diminishing into footstalks ; peren- 
nial ; flowers in June and July, and is frequent in 
ditches, rivers and lakes. The flower-spike only of this 
plant appears above water. 
Pot. Pectinatum , Fennel-leaved Pondweed ; with 
setaceous, parallel, approaching leaves, set on two 
sides of the stem, and sheathing at the base ; perenni- 
al ; flowers in July, and not uncommon in rivers and 
pools, and is also met with in salt-water ditches. 
Sagina. Gen. cJiar.—- Cal. four leaved ; petals four ; 
caps, one celled. 
Sag. Procambens, Procumbent Pearlwort ; with pro- 
cumbent, smooth stems, and very short petals ; peren- 
nial ; flowers from May to August, and is a common 
plant in sandy places, on walls, and in the neglected 
walks of gardens. 
