568 
GRAMINEJE. (GRASS FAMILY.) 
Synopsis. 
I. P0ACEA3, R. Br. (Homoclinae, Nees.) Spikelets 
1 - many-flowered, homogamous ; the flowers all alike and 
perfect, or the uppermost abortive or rudimentary. 
Tribe 1. ORYZEA2.— Spikelets 1-flowered; the flowers often 
monoecious, in branched panicles. Glumes frequently want¬ 
ing! Inner palea 3-nerved ! Squamulse 2. Stamens 1-6. 
1. Leersia. Flowers perfect, flattened, awnless. Glumes none. 
2. Zizania. Flowers monoecious, awned. Glumes obsolete or none. 
Tribe 2. AGROSTlDE.dE. — Spikelets 1-flowered, perfect, some¬ 
times with the abortive pedicel or rudiment of a second flower 
above, panicled, or the panicle sometimes contracted into a 
dense cylindrical spike or head. Stamens no more than 3. 
* (Phleoideae.) Glumes equal, strongly keeled, boat-shaped and 
membranaceo-herbaceous, as well as the paleae. Squamulae 2. 
Grain free. Inflorescence densely spiked. 
3. Alopecurus. Glumes united at the base. Lower palea awned 
on the back, the upper one wanting. 
4. Phleum. Glumes distinct. Paleae 2, the lower truncate. 
* * (True Agrostideas.) Glumes equal, or often unequal, concave 
or keeled, membranaceous. Paleae membranaceous or nearly so. 
Squamulie 2. Grain free. Inflorescence panicled, open, or often 
contracted, but not strictly spiked. 
•*-Glumes and paleae neither awned, bristle-bearing, nor mucronate, 
naked. Flower sessile in the glumes, naked at the base : lower 
palea 1-nerved. Fruit deciduous. 
5. Vilfa. Seed adherent to the closely investing pericarp, forming 
acaryopsis, or true grain, as in most Grasses. Panicle spiked. 
6. Sporobolus. Seed loose in the obovoid or globular pericarp 
(utricle). Panicle spiked or diffuse. 
■*“ Glumes or the (3 —5-nerved) lower palea awned, bristle-pointed, 
or mucronate (except in some sp. of Agrostis). Flower raised on 
a more or less evident stalk (callus) in the glumes, naked, or 
barely hairy, at the base. 
* . Agrostis. Glumes equal, or the lower rather longer, pointless, 
exceeding the very thin blunt paleae. Lower palea point¬ 
less, commonly awned on the back; the upper sometimes 
wanting. Panicle open. 
8. Cinna. Glumes acute, the lower somewhat smaller, shorter than 
the paleae and similar in shape. Paleae raised on a distinct 
naked stalk, smooth and beardless; the lower short-awned 
below the tip. Stamen 1. Upper palea 1-nerved ! 
