Triandria . 
4f 
Poa Annua , Annual Meadow-grass ; panicle divari- 
cated, spikelets ovate, and chiefly four-flowered, with 
an oblique compressed stem ; flowers through the whole 
summer, and is one of the most common grasses. 
Stipa. Gen. char Cal. two-valved, one flowered j 
exterior valve of the corolla with a very long terminal 
awn, articulated at the base. 
Stip. Pennata , Feather-grass, awns woolly; perennial; 
flowers in July; and is cultivated in the garden on ac- 
count of its beautiful awns. 
A vena. Gen. char. — calyx two-valved, many flower- 
ed ; cor. exterior valve awned on the back, awn twisted. 
Av. Fatua, Wild-oat, or Haver; paniculated, cal. con- 
taining about three flowers, the florets hairy at the base, 
and all of them awned, and without nerves ; annual ; 
flowers in August, and is not uncommon in fields and 
among corn. 
To this genus belong the numerous varieties of the 
cultivated oat, beside many other species, some of 
which are native and some are exotic. 
Arundo. Gen. char. — Cal. two-valved, florets sur- 
rounded with persistent down. 
Arun. Phragmites, Common reed ; Cal. five flower- 
ed, panicle lax ; perennial ; flowers in July, and is well 
known as a native of ditches, stagnant waters, and 
banks of rivers, in Britain. 
Saccharum Officinarum, Sugar-cane. Gen. char. 
Cal. two-valved, covered with down at the base, one- 
flowered ; cor. two-valved. Spec. char. — FI ewers pa- 
raded, and flat leaves. 
