342 
CLASS III. ORDER II. 
paleas 2-valved, awTiless, anequal ; flowers | 
in unilateral spikes, somewhat imbricated 
in 2-rows. (salt-grass.) 
Kyi.lin"ga. Flowers distinct, disposed 
in a roundish, sessile, eub-imbricated spike ; 
glumes 2-valved, l-flowered; paleas 2, 
longer than the glumes, (bog-rush.) 
ORyzop"sis. Glume l-flowered, 2-vaIv- 
ed ; valves membranaceous, nearly equal, 
iax, obovate, awnless ; paleas 2, coriaceous, 
cylindric ovate, hairy at the base, the low- 
er one awned at the tip ; scales linear-elon- 
gated ; flowers panicled. (mountain rice.) 
RHyNCHOS"poRA. Glumes fascicled into 
a spike, the lower ones empty; seed 1, 
crowned with a persistent style ; bristles 
surrounding the base, (false bog-rush.) 
Sch(e'nus. Glumes fascicled into a spike, 
the lower ones empty; style deciduous; 
seeds naked. 
Scik"pus. Glume 1-valved, 1-flowerod, 
imbricated on all sides ; seed or nut naked 
or bristled at the base, (club rush.) 
Mie'gia. Flowers polygamous, panicled ; 
glume 2-valved, many-flowered, short and 
unequal ; paleas 2, unequal, the larger one 
acuminate ; style very short, 3-cleft, plu- 
mose; nectary 3-parted, divisions lanceo- 
late, acute, as long as the geiTa, large, 
acuminate, (cane.) S. 
Nar"dus. Glume l-flowered, 1-valved ; 
palea 1, included in the calyx ; stigma 1. 
Flowers spiked, alternating and sessile, 
(mat-grass.) 
Xy'ris. Calyx a cartilaginous glume, 2 
or 3-valved, in a head ; corolla 4-petalled, 
equal, crenate ; capsule 3-valved, many- 
seeded, (yellow-eyed grass.) 
ORDER II. DYGYNIA. 
A. Spikelets \-Jlowered; corollas without 
abortive rudiments of flowers at the base. 
[Calyx and corolla different in texture.^ 
Leer^sia. Calyx 0; corolla 2-valved, 
closed ; valves compressed, boat-shaped ; 
nectary obovate, entire, collateral; sta- 
mens varying in number, (cut-grass.) 
MiL^iUM. Glume 2-valved, naked, beard- 
less ; paleas 2, oblong, concave, shorter 
than the glume, awnless; seed 2-horned; 
flowers panicled. (cane.) 
Pas"palum. Glume in 2 membranaceous, 
equal, roundish valves; paleas awnless, 
cartilaginous, of the form of the glume; 
Btigma plumose, colored ; nectary lateral ; 
flowers in unilateral spikes. 
Piptathe'rum. Glume membranaceous, 
longer than the cartilaginous, oval paleas ; 
lower valve awned at the tip ; nectary 
ovate, entire ; seed coated. 
Aris"tida. Glume 2-valved, membrana- 
ceous, unequal ; paleas 2-valved. pedicel- 
led, sub-cyUndric, lower valve coriaceous, 
involute, 3-awned at the tip, upper valve 
very minute or obsolete ; nectary lateral, 
([beard-grass.) 
Sti'pa. Glume 2-valved, membranaceous ; 
i) ale as 2-valved, coriaceous, valves invo- 
ute, truncate ; awn terminal, long, cadu- 
cous ; seed coated, (feather-grass.) 
Sac^'charum. Calyx involucred, with 
long wool at ^he base, 2-vaIved ; corolla i 
or 2-valved ; stamens 1 to 3. (sugar-cane.) 
[Calyx and corolla of similar texture — 
flowers in spreading panictes.] 
Agros"tis. Calyx herbaceous, 2-valved, 
1- flowered, valves acute, a little less than 
the corolla ; corolla 2-valved, membrana- 
ceous, often hairy at the base ; stigmas 
longitudinally hispid or plumose; florets 
spreading; nectary lateral; seed coated, 
(redtop.) 
Muhlenberg"ia. Glumes 2, very mi- 
nute, unequal, one scarcely perceptible, 
paleas 2, many times longer than the 
glumes, linear-lanceolate, nerved, hairy at 
base, the lower one terminating in a long 
awn. 
Arun'^do. Calyx 2-valved, unequal, mem 
branaceous, suirounded with hair at the 
base, lower valve mucronate or slightly 
awned. Sometimes there is a pencil-form 
rudiment at the base of the upper valve 
(reed.) 
[Calyx and corolla of similar texture; 
flowers in compact panicles, often spiJce- 
form.] 
Phle'um. Calyx hard, 2-valved, equal, 
sessile, linear, truncate, bicuspidate; co- 
rolla enclosed in the calyx, 2-valved, awn- 
less, truncate, (timothy-grass.) 
Ai.opecu'rus. Glumes 2, equal, gener 
ally connate at the base ; paleas 1-valved, 
utricle-like, cleft on one side, awne'I below 
the middle, (foxtail-grass.) 
B. Spikelets I flowered ; corolla with 1 or 
2 abortive rudiments of flowers at the base. 
[Calyx and corolla of similar texture.] 
Phala'ris. Calyx membranaceous, 2- 
valved, valves keeled, nerved, equal in 
length, including the 2-valved, pilose corol- 
la ; the corolla is shorter than the calyx 
and coriaceous; rudiments opposite, ses- 
sile, resembling valves ; nectary lateral, 
(riband-grass, canary-grass.) 
C. Spikelets many flotcered. [Flowers tn 
panicles ; corolla unarmed.] 
Phragmi'tes. Calyx 5 to 7-flowered; 
the florets on villose pedicels, lower 
valve elongated, acuminate, involute, up- 
per one somewhat conduplicate. 
Bri'za. Spikelets heart-ovate, many- 
flowered ; calyx chaffy, shorter than the 
2- ranked florets ; corolla ventricose, lower 
valve cordate, upper one orbicular, short, 
(quake-grass.) 
Po'a. Spikelets oblong or linear, com 
pressed, many -flowered ; calyx shorter 
than the florets ; corolla herbaceous, awn- 
less, often scarious at the base ; lower 
valve scarious at the margin, (spear-grass.) 
Sor'^ghum. Florets in pairs, one perfect, 
with a 3-valved corolla and sessile, the 
other staminate or neuti-al, and pedicelled. 
(broom-corn.) Ex. 
[Flowers in panicles ; coi'olla armed or 
mucronate.] 
Dac"tylis. Spikelets aggregated in 
unilateral heads, many -flowered ; ca'yat 
