428 CXLII. GEAMINEiE. 



Analysis of Tribes and Suhtrihes. 



Tribe 1. Fanicese, R. Br. — Spikelets articulated closely below tlie 

 lowest glume, 2- very rarely 3-flowered. Upper glume always containing 

 tlie most perfect and only fertile flower. Axis of spikelet never, B'mjfia 

 excepted, produced beyond the flowering glume. Scales never more than 

 2. — (In subtribe MayadecB the spikelets are moneecious and the sexes dis- 

 similar, and occupy difierent parts of the panicle.) 



Subtribe 1. Eupanice^. Flowering glume never awned with a twisted 

 awn, occasionally mucronate, never bearded at the base. Empty and 

 flowering glumes frequently similar in consistence. Flowering ghime and 

 palea generally hardening in fruit and always enclosing the grain, wliich is 

 shorter than the palea. Palea of fertile flower never deficient. 



Subtribe 2. Teistegine^. Flowering glume (in Cape species) bearded 

 at base and awned with a twisted awn. In other respects as in Eupanicecz. 

 — Panicle generally loose. 



Subtribe 3. Andeopogine^. Flowering glume very often awned with 

 a twisted awn, and palea never hardening in fruit, often extremely thin 

 and always thinner than the barren glumes. Grain often longer than the 

 palea, wliich is occasionally absent. — Spikelets generally placed 2 together, 

 often very dissimilar, not inserted in hollows of the rachis. 



Subtribe 4. MATADEiE. Spikelets monoecious, occupying different parts 

 of the panicle. Males very numerous. Females few, generally concealed 

 in a somewhat bony (hardened) involucre. 



Tribe 2. Fhalaridese, Munro. — Spikelets articulated sometimes as in 

 Paniceee, and sometimes at the base of the pedicels, near the main axis, 3- 

 or apparently 1-flowered. Outer empty glumes laterally compressed, often 

 united at base, longer than the rest. Flowering glume terminal, generally 

 hairy, with 2 rudimentary glumes below it. Otherwise as in PanicecB. — 

 (Intermediate between Panicece and Poacea.) 



Tribe 3. Foacese, R. Br. — Spikelets always (except in FivgerTiuthia) 

 articulated above the lowest ghune, 1- or many-flowered. — Lowest flower, 

 with very few exceptions, perfect ; terminal flower never (except in two 

 genera of Bamhusea;) more perfect than those below it. Axis of the spike- 

 let almost invariably terminated by an imperfect glume, which is frequently 

 reduced to a small point or bristle. Scales 3 in StipacecB and Bamhnsece, 

 2 in all other subtribes. Stamens 1-3, rarely 6. Fridt always shorter tiian 

 the flowering glume. 



Subtribe 1. Ageostideje. Spikelets with one flowering glume and an 

 occasional rudiment of a second. The callus, inside the empty glumes, 

 generally rounded and often bearded. Flowering glume thin. Awn, if 

 present, dorsal, slender, and not twisted. 



Subtribe 2. Stipace^. Spikelets always 1-flowered. Callus generally 

 sharp-pointed. Flowering glume thickened and (except in Lasiagrostis) 

 closely enveloping the palea. Awn always present, terminal, simj)le or 

 3 -cleft, frequently twisted. Scales 2-3. 



Subtribe 3. OeyzE-S:. Spikelets 1-3-flowered, laterally compressed, only 

 1 flower perfect. Lowest glumes generally rudimentary, often almost 

 obsolete. Flowering glume occasionally awned with a terminal awn, which 

 i 8 never twisted. Scales 1-2, Stamens (in the Cape species) 6. 



