CLASS III. ORDER II. 
315 
hair at the base ; lower valve mucronate or slightly awned. Sometimes there 
is a pencil-form rudiment at the base of the upper valve. 4. 10 — (reed.) 
( Calyx and corolla of similar texture-flowers in compact panicles , often 
spike-form.) 
Phle'um. Calyx hard, 2-valved, equal, sessile, linear, truncate, bieuspi- 
date : corolla enclosed in the calyx, 2-valved, awnless, truncate. 4. 10 — 
(timothy-grass.) S. 
B. Spikelets 1 flowered ; corolla with 1 or 2 abortive rudiments of flowers at 
the base. 
( Calyx and corolla of similar texture.) 
Phalaris. Calyx membranaceous, 2-valved, valves keeled, nerved, equal 
in length, including the 2-valved pilose corolla. The corolla is shorter than 
the calyx and coriaceous : rudiments opposite, sessile, resembling valves : 
nectary lateral. 4. 10 — (ribbon-grass, canary-grass.) S. 
C. Spikelets many-flowered. 
( Flowers in panicles ; corolla unarmed.) 
Bhi'za. Spikelets heart-ovate, many-flowered : calyx chaffy, shorter than 
the 2-rankcd florets : corolla ventricose : lower valve cordate, upper one orbi- 
cular, short. 4. 10 — (quake-grass.) S. 
Po'a. Spikelets oblong or linear, compressed, many-flowered : calyx short- 
er than the florets : corolla herbaceous, awnless, often arachnoid at the base ; 
lower valve scarious at the margin. 4. 10 — (spear-grass.) S. 
Exotic. 
Sorghum. Florets in pairs, one perfect, with a 3-valved corolla, and ses- 
sile ; the other staminate or neutral, and pcdicelled. 4. 10 — (broom-corn.) 
( Flowers in panicles ; corol armed or mucronate.) 
Dac' tylis. Spikelets aggregated in unilateral heads, many-flowered : ca- 
lyx shorter than the florets, with one large glume, keeled, pointed : corolla 
with the lower valve keeled, emarginate, mucronate ; upper valve sub-condu- 
plicate. 4. 10 — (orchard-grass.) S. 
Ave'sa. Calyx 2-valved ; 2, 3, or many-flowered: corolla, valves mostly 
bearded at the base, lower one torn, with a twisted awn on the back : glumes 
membranaceous, and somewhat follicle-like : seed coated. 4. 10 — (oats.) S. 
D. Flowers in spikes. 
Lo'lium. Calyx 1-leafcd, permanent, many flowered : florets in many flow- 
ered 2-rowed simple sessile spikelets on a rachis : lower valve of the corolla 
herbaceous-membranaceous, mucronate, or bristled at the tip. 4. 10 — (dar- 
nel-grass.) 
Tri'ticum. Calyx 2-valved, about 3-flowered ; florets sessile on the teeth of 
the rachis, obtusish and pointed : glumes beardless, or interruptedly bearded. 
4. 10. — (wheat.) 
Seca'le. Calyx 2-valved, 2 or 3-flowerd : spikelets sessile on the teeth of 
the rachis, with the terminal floret abortive : calyx 2-valved ; glumes subu- 
late, opposite, shorter than the florets : corolla with the lower valve long-awn- 
ed. 4. 10 — (rye.) 
E. Flcnoers polygamous. 
(In panicles.) 
Pan "icttM. Calyx 2-valved, 2-flowered ; the lower glume generally very 
small : the lower floret abortive, 1 or 2-valved ; the lower valve resembling 
the calyx, the upper one membanaceous : perfect floret with cartilaginous 
valves, unarmed. 4. 10 — (cockfoot-grass, panic-grass.) S. 
(In spikes.) 
Hor' deum. Spikelets 3 at each joint of the rachis, 1 or 2-flowered, all per- 
