32 
TRIANDRIA. 
Class III. 
140. Axonopus. The inflorescence digitate. Spikelets simple. Otherwise, as Paspalum. 
141. Milium. Glume naked, beardless, 2-valved : the valves concave, larger than the paleje, which are two, 
concave and equal. Seed coated with the indurated palese. 
142. Knappia. Glume 1-flowered, 2-valved, truncate, beardless. Palea one, torn, the divisions setigerous 
and united at the base, enfolding the stamens and pistillum. Flowers alternate in a flexuose rachis. Seed loose. 
143. Digitaria. Inflorescence digitate or fascicled. Spikelets 1-sided, flower-stalks 2-, or many-flowered. 
Glume 2-valved, the lower valve very minute. Of the lower neuter floret the paleae membranous. Of the 
upi>er hermaphrodite floret the paleas subcoriaceous, hardened. Seed slightly furrowed. 
144. Panicum. Glume 3-valved : valves unequal, the outer being very small. Paleae two, concave, equal, 
beardless. Seed coated with the hardened palese. Panicle scattered and loose. 
145. Setaria. Has the same character as Panicum, except that the panicle is spiked. 
14S. EchinocMoa. Has the character of Panicum, except that the panicle is composed of alternate spike- 
lets, and the third valve of the glume is bearded. 
147. Orthopogon. Has the character of Echinochloa, except that both the intermediate and third valves of 
the glume are bearded. 
148. Penicillaria. Involucrum bristly : the bristles eq,ual, pinnated, bearded. Glume 2-valved, very small, 
membranous. Lower floret male, upper hermaphrodite : the paleae subcartilaginous and entire. Anthers vil- 
lous at the end. Spike compound, cylindrical, with stalked involucrated spikelets. 
149. Lappago. Glume 2-valved, valves unequal : the lower very minute, membranous, the upper cartilagi- 
nous, very large, with soft prickles. Paleas 2-valved, membranous, shorter than the glume. Scales very smaU, 
fringed. Panicle simple spike-shaped ; the branches 3-flowered. 
2. Inflorescence panicled. Spikelets solitary, 1-flowered. Glumes membranous, the lower Palece coriaceous, 
bearded, enfolding the upper, which has not two Keels. (Stipacea.) 
150. Stipa. Glume 2-valved, 1-flowered, membranous, longer than the two cartilaginous paleae, of which the 
lower is convolute, with a long beard at the apex ; upper entire. Beard jointed at the base, deciduous. Scales 
oblong, entire. Seed furrowed. Panicle almost simple, lax. 
3. Itiflorescenoe panicled, sometimes contracted info the form of a spike. Spikelets solitary, 1-flowered. Glumes 
and PalecE of nearly similar texture, most usually with a Keel. Lower Palece either bearded or beardless, the 
upper never with two Keels. (Agrostidea.) 
151. Muhlenbergia. Glume 2-valved . valves very minute, fringed, three times as short as the paleae, the 
lower of which has a bristle. Scales ovate, obliquely truncate, gibbous. Seed naked, not furrowed. Panicle 
nearly simple, contracted or spreading. 
152. Chceturus. Lower valve of the gluma with a long bristle, upper acute. Paleae membranous, the lower 
valve trifid, upper bifid. Flowers spiked, inserted into the elongated teeth of the rachis. 
153. Laguriis. Glume 2-valved, 1-flowered, each valve ending in a villous beard. Outer paleae with two 
terminal beards, and a third, which is dorsal and twisted back. Panicle spike-shaped, ovate, hairy. 
154. Polypogon. Glume 2-valved, 1-flowered : valves nearly equal, obtuse at the end Avith a long bristle, 
much longer than the somewhat cartilaginous paleae. Lower palea below its end, which is entire, with a 
straight short tender bristle, upper bifid, toothed. Panicle contracted, like a spike. 
155. Gnstridium. Glume 2-valved : valves ventricose at the base, 3 times as long as the hardened coriaceous 
paleae. Paleae 2, the lower 3-4-toothed with a bristle under the end, the upper bifid, toothed. Panicle com- 
pound, contracted like a spike. 
15f5. Agrostis. Glume naked, beardless, 2.valved : valves concave, longer than the paleae, which are 2, and 
enclose the seed. 
157. Trichodium. Glume 2-valved, 1-flowered. Palea one, shorter than the glumes, bearded, and supported 
at the base by one or two fascicles of hairs. Seed loose, covered by the palea. 
158. Tristegis. Glume naked, 3-valved : valves concave, the outer very small, the intermediate longer than 
the palea;, the third bearded. Paleae 2, concave, equal, obtuse, beardless. Seed inclosed in the paleae. 
159. Sporobolus. Glume naked, beardless, 2-valved : valves concave, much shorter than the paleae, which are 
two, concave, nearly equal, beardless. Seed not inclosed in the paleae. 
160. Airopsis. Glume 2-flowered : valves nearly equal, navicular, longer than the florets. Lower paleae trifid 
at the end, upper entire. Seed loose, not furrowed. Panicle contracted, compound. 
Ifil. Cinna. Glume naked, beardless, with 2 concave valves shorter than the pale®, which are 2, nearly equal, 
concave, with long points : the outer one being bearded or beardless. Seed enclosed in the paleae. 
162. Psamma. Glumes nearly beardless. Paleae under the end emarginate, mucronate, shorter than the 
glumes. Scales 2, subulate. Style 3-parted. Seed turbinate. Spike compound, erect, cylindrical. 
163. Crypsis. Glume 2-valved, I-flowered, compressed, unequal. Palete 2, unequal, longer than the glume. 
Seed loose, covered by the paleae. 
164. Alopecurus. Glume 2-valved, 1-flowered : valves somewhat equal, connate, distinct. Paleae united into 
a bladder-like glume split on one side, below the middle (generally), bearded. Scales linear, entire. Spike com- 
pound, contracted, without involucrum, branches very small, branching. 
165. Phleum. Glume 2-valved, naked, with a point or little beard out of the nerve at its back : valves navi- 
cular, including the pale», which are 2, navicular and beardless. Beard of the glume lengthened. Second 
floret sessile. 
166. Achnodonton. The character of Phleum, except that the beard of the glume is very minute. 
167. Chi/ochloa. The character of Phleum, except that the second floret is stalked. 
168. Phalaris. Glume 2-valved, naked, beardless : the valves navicular, inclosing the paleae, which are two, 
and navicular also, beardless and naked at the base, but supported by hairs or accessory glumes. 
4. Inflorescence panicled. Spikelets solitary, 2 or many-flowered. Glumes with a keel. Palece of nearly the 
same texture as the glumes^ the lower carinate or concave, always bearded, the upper with two keels. (Bromea ) 
169. Corynephorus. Glume 2-flowered. Valves membranous, longer than the florets. Lower palea entire, 
having at its base a beard, jointed in the middle, woolly, twisting and small below, clavate above ; upper bifid, 
toothed. Panicle compound. 
170. Aira. Spikelets slender. Glume 2.flowered, rarely 3-flowered, beardless, 2-valved, equal to the florets 
or shorter. One of the florets on a stalk. Paleae 2, equal, enclosing the seed when ripe. 
171. Avena. Glumes membranous, 2-7-flowered, longer than the florets. Lower palea twice torn, or, with 
the upper, bifid-toothed, sometimes eroded, having at the back a plaited twisted beard. Scales ovate. Seed 
coated, furrowed. Panicle compound, loose. 
172. Trisetum. Lower palea with 2 bristles and a tender flexuose beard above the middle of its back. Scale 
lanceolate. Other characters of Avena. 
173. Danthonia. Lower palea 2-toothed, with a plaited twisted beard from between the teeth, upper obtusely 
truncated. Seed loose, not furrowed. Panicle simple. Other characters of Avena. 
174. Gaudinia. Glume unequal, obtuse. Lower palea bifid-toothed, bearded at the back above the middle : 
the bearded twisted and plaited. Upper palea 2.4-toothed. Seed coated, furrowed. Spikelets sessile, alter, 
nate, with 9-11 2-ranked flowers. 
175. Arundo. Glume naked, beardless, 2-valved : the valves wrapping up the paleae which are 2-bearded and 
surrounded by bristles. Seed inclosed in the paleae. 
176. Chrysurus. — Neuter spikelet. Glume linear, subulate, with remote florets. Paleae 1, sterile. Herma- 
phrodite spikelet, 1-flowered. Glumes subulate, linear. Floret stalked. Lower palea below its end, which is 
entire, setigerous, the upper entire. Seed with two beards, not furrowed. Panicle compound, branching. 
177 Sesleria. Common involucrum many-leaved : the leaflets sometimes deciduous. Glume 3.4-flowered. 
