Bite. . ——ar 
* 
Gramineae (Poaceae) Grass Family 
pany 
EN ee Se Se 
Herbs with round, usually hollow stems, (solid in Androvo on) 
solid nodes, and 2-ranked, parallel veined lea caQnposed vf 
blade, a membranaceous or hairy appendage, the ligule. 
arranged in spikelets, 
inclosed flower compose the floret; 
l=-celled, l-ovuled ovary, 2 styles,and usually plumose stigmas; 
the hilum. 
Key to the Tribes. 
O Spikelets & eaiey above the glumes (see also Alopecurus 
fans Chlorideae):no sterile lemnas below the fertile 
4 < florets (see also Phalaris.) 
a Spikelets 2 to several flowered 
4 Spikelets sessile 
G Spikelets on opposite sides of the rachis; 
/O spike single and terminal 
£ Spikelets in two rows on one side of the 
Jorhachis$ spikes racemose 
4 Spikelets pediceled 
© Lemnas awnless or awmed from the tip; 
/O shorter than the spikelet 
glumes 
& Lemmas avmed from the backg (awnless& nearly 
/ so in Sphenopholis, Koeleria, and frisetum 
/O¢ Wo1rii): glumes equaling or exceeding the 
\ florets 
2, Spikelets 1-flowered 
“ Spikelets with 2 rudimentary florets below the 
& fertile one 
4 Spikelets with no rudimentary florets below the 
f fertile one 
*Text contributed by Mre Jason R. Swallen 
parts, 
the sheath, enveloping the culm, its margins overlapping or grown together, 
and the blade, bearing on the inside, at the junction of the sheath and 
Flowers perfect, 
these composed of few to many 2-ranked bracts alternate 
on a central axis, the rachilla, the lower two bracts, the glumes, empty, the 
succeeding mes, the lemmas, subtending a perfect flower, and between the 
flower and the axis an additional bract, the palea; the lemma, palea, and Wr 
stamens usually three; pistil 1, with a 
fruit a caryop- 
sis with starchy endosperm and a small embryo at the base on the side opposite 
II. Hordeae 
Ve. Chlorideae 
III. Aveneae 
VI. Phalarideas 
IV. Agrostideae 
