Family POACEZ® 37 
Spikelets not in two rows, some or all usually pediceled, inflores- 
cence rarely spicate. 
Spikelets 2 to many-flowered; the lowest flower always perfect. 
Flowering scales generally longer than the empty scales; awn- 
less or straight awned at or near the apex. 1. Festucee. 
Flowering scales shorter than the empty scales, usually with a 
bent dorsal awn. 4, Avenee. 
Spikelets 1 or 2-flowered, when 2-flowered the lower staminate or 
rudimentary. 
Palet keeled, similar to the flowering scale; empty scales small 
or wanting. 8. Oryzez. 
Palet quite different from the flowering scale; empty scales 
usually present. 
Flowers, at least some of them, perfect. 
Spikelets alike, all with a perfect flower. 
5th scale enclosing the flower, 3rd and 4th small, often 
reduced to bristles. 5. Phalaridez. 
3rd or 4th scale enclosing the flower. 
Flowering scales if indurated awned, the 3rd scale en- 
closing the flower. 7. Agrostidee. 
Flowering scales indurated, awnless; the 4th scale 
usually enclosing the perfect flower. 6. Panicee. 
Spikelets of two kinds, some perfect and sessile, accom- 
panied by 1 or 2 pediceled, staminate or rudimentary 
ones. 9. Andropogonee. 
Flowers all staminate or pistillate; the staminate above the 
pistillate. 10. Maydeez. 
Tribe 1. FESTUCEZ. 
Styles short with plumose stigmas protruding at the sides of the 
scales; inflorescence various, not of axillary clusters. 
Rachilla, if hairy, with hair much shorter than the flowering scales. 
Flowering scales 5—many nerved. 
Upper scaies, if empty, narrow and not enclosing each other. 
Flowers perfect. 
Spikelets not in dense one-sided clusters. 
Styles attached below the apex of the ovary; flowering 
scales usually over 6 mm. long; leaf-sheaths often 
closed. 1. Bromus. 
Styles attached to the tip of the ovary; flowering scales 
6 mm. long or less. 
Flowering scales rounded on the back. 
Flowering scales without hairs at the base. 
Flowering scales acute, pointed or usually awned 
at the apex. 2. Festuca. 
Flowering scales obtuse or hyaline at the apex. 
Seales obscurely 5-nerved, styles none. 
3. Puccinellia. 
Seales distinctly 7-nerved, styles present. 
4. Panicularia. 
Flowering scales with tufts of hair at the base. 
5. Scolochloa. 
Flowering scales more or less keeled. 6. Poa. 
Spikelets collected in dense one-sided clusters. 7. Dactylis. 
