ANTHOPHYTA 359 
Family 31. Poaceae. Grasses, with 2-ranked leaves. 
(Sp. about 3,545.) 
There are six tribes and several sub-tribes, of which the 
Bamboos are the lowest, while the 
Agrostideae, Paniceae and Maydeae 
are at the summits of as many di- 
verging phyletic lines. These groups 
may be distinguished as follows: 
A. Woody plants; a joint between the leaf-blade and the 
sheath. 1. Bamboos. (Bambuseae) 
Bambusa. 
B. Herbaceous plants; no joint between the leaf-blade 
and sheath. 
I. Spikelets with the larger flowers at the base. 
1. Spikelets typically containing several to many 
flowers. 
a. Mostly arranged in panicles; awns ter- 
minal. 2. Fescue Grasses (Festuceae) 
—Bromus. 
b. Arranged in panicles; awns dorsal. 2a. 
Cat Grasses (Aveneae)—Avena. 
c. Sessile in two rows on the opposite 
sides of the main stem. 2b. Wheat 
Grasses (Triticeae)—Triticum. 
d. Sessile in two rows on one side of a flat- 
tened axis. 2c. Gramma Grasses. 
(Chlorideae)—Bouteloua. 
2. Spikelets containing but one flower. 3. Red- 
top Grasses (Agrostideae)—Agrostis. 
II. Spikelets with the larger flowers at the top. 
1. A joint above the empty glumes. 
a. Spikelets with five glumes; palets one- 
nerved. 4. Canary Grasses (Phal- 
arideae)—Phalaris. 
2. A joint below the empty glumes. 
a. Spikelets flattened laterally, one-flowered. 
4a. Rice Grasses (Oryzeae)—Oryza. 
b. Spikelets not flattened laterally, one to 
two-flowered. 
(1) Stems hollow, medium sized to 
small. 5. Panic Grasses (Paniceae)— 
Panicum. 
