|
| 1 |
Culms woody, perennial; blade-base articulating from the sheath, ussually petiolate |
|
subfam. 6. Bambusoideae |
| + |
Culms herbaceous, annual or perennial and not woody; blade-base not articulating from the sheath. |
|
(2) |
| |
|
|
|
| 2 (1) |
Spikelets of one to many florets, if bearing two florets then the lower floret usually
perfect; spikelets terete or laterally compressed, breaking up at maturity above the more or less persistent glumes |
|
(3) |
| + |
Spikelets of two florets (1 floret in Sphaerocaryum), the lower staminate or neutral,
the upper mostly perfect, fertile; spikelets usually dorsally compressed, falling of entirely together with glumes at maturity; length of embryo more than 1/3 as long as the spikelet |
|
subfam. 5. Panicoideae |
| |
|
|
|
| 3 (2) |
Glumes usually wanting or inconspicuous; palea odd-nerved, if 2-nerved, then
linear or enclosed in a sac-like lemma |
|
subfam. 1. Oryzoideae |
| + |
Glumes distinct; paleas 2-keeled or inconspicuous nerved |
|
(4) |
| |
|
|
|
| 4 (3) |
Lemmas 5- to many-nerved; blade-base devoid of long hairs; length of embryo
less than 1/4 as long as the caryopsis; lodicules acute or acuminate, nerveless |
|
subfam. 3. Festucoideae |
| + |
Lemmas 1- to 3-nerved, or nearly nerveless; blade-base ususally with long
hairs, length of embryo more than 1/3 as long as the caryopsis; lodicules truncate, nerved. |
|
(5) |
| |
|
|
|
| 5 (4) |
Lemmas distinctly nerved; spikelets nearly terete, laterally compressed; usually a tall reed |
|
subfam. 2. Arundinoideae |
| + |
Lemmas faintly nerved; spikelets compressed; small to medium sized grasses |
|
subfam. 4. Eragrostioideae |
|
