350 
GRAMINE/E. 
1. Digitahia. Spikes fingered. Spikelets in 2 rows on one 
side of a flattened rachis, unarmed, 1 -flowered with an in- 
ferior rudiment. Glumes 2, lower very small, upper 3- 
nerved. Sterile fl. of one 5 — 7-nerved palea, resembling the 
upper glume and equalling the flower. 
2. Echinochloa. Spikes compound, secund in the whole 
and in each part. Spikelets on one side of a flattened rachis, 
2- rlowered, inferior fl. rudimentary. Glumes 2, lower small* 
3- nerved, upper as long as the fl. 5 -nerved mucronate. Outer 
palea of the sterile fl. resembling and equalling the upper 
glume. 
3. Setaria. Spike cylindrical, compound. Spikelets sur- 
rounded by an involucre of bristles, 2-flowered, inferior fl. 
rudimentary. Glumes 2, lower small 3-nerved, upper as 
long as the fl. many-nerved. Sterile fl. of 1 palea resembling 
the upper glume. 
Tr. II. PHALARIDEjE. Spikelets laterally compressed, 1- 
flowered, with 1 or 2 or more below resembling the glumes. 
Styles long. Stigmas filiform, protruded from the summit 
of the spikelet. 
4. Phalaris. Glumes 2, navicular, carinate, membranaceous, 
nearly equal, longer than the flower. Palea? coriaceous, un- 
equal, closely investing the fruit. Rudimentary .fl. 1 — 2, 
each consisting of a single scale. 
5. Anthoxanthum. Glumes 2, unequal, membranous, lower 
small 1-nerved, upper longer than the fl. 3-nerved. Palea? 
scarious. Stam. 2. Rudimentary fl. 2, each consisting of 
a single notched scale awned on the back. 
6. Hierochloe. Glumes 2, nearly equal, membranous, 3- 
nerved, about as long as the flowers. Fl. 3 ; 2 lower male, 
3-androus, upper palea with 2 keels ; upper herm., 2-androus, 
upper palea with 1 keel. 
Tr. III. PHLEINE/E. Spikelets laterally compressed, 1- 
flowered or with a superior rudiment. Glumes nearly equal. 
Styles and stigmas as in Tr. II. Inflorescence a spikelike 
panicle. 
7. Phleum. Glumes parallel to the midrib which is pro- 
longed into a seta. Fl. 1. Palea? 2, membranous, lower 
3-nerved obtuse without awns. 
8. Alopecurus. Glumes membranous, acute. Fl. 1. Palea 
1, scarious, 5-ncrved, awned on the back, the margins 
usually connected below. " Styles usually combined." 
9. Knappia. Inflorescence a somewhat 1-sided raceme. Glumes 
