24 THE FLORA OF THE NOETHEEN TEEEITOEY. 



Spikelets in single or few pairs or triplets on the slender branches of a more 

 or less compound panicle. — 3. Imperata. 



Spikelets in triplets (1 sessile and fertile between 2 pedicellate and male 

 neuter or rudimentary) within sheathing bracts. — 10. Anthistiria. 



Sub-tribe V. — Tristeginese. Spikelets paniculate, all similar, the terminal 

 flowering glume more or less stiffened or enlarged when in fruit almost as in 

 Paniceae, but the awn twisted and bent as in Andropogonese. — 14. Arundinella. 



B. Poacese. Pedicels not articulate below the glumes. Rachis of the 

 spikelet articulate above the 2 or 3 lowest glumes, or wholly continuous. Spike- 

 lets with one or more fertile flowers, the males or imperfect ones if any above or 

 very rarely below them. 



Tribe IV. — Phalarideae. Spikelets with one terminal hermaphrodite 

 flower and rarely two male flowers lower down. Glumes 2 to 6, all keeled or 

 with a central nerve, 2 below the articulation of the rachis persistent or in 

 several genera deficient,, 4 or fewer above the articulation, of which 2 enclose 

 the grain without any distinct 2-nerved palea. — 26. Oryza. 



Tribe V. — Steptatherae. Spikelets with 1, 2, or rarely several hermaphro- 

 dite flowers, and rarely a male flower above or below. Flowering glume 

 usually bearing an awn twisted in the lower part, bent or divided about the 

 middle. Palea 2-nerved, usuaUy thin or small, awn, 3-branched. — 27. Aristida. 



Tribe VI. — Astreptae. Spikelets with several or in a few genera only 1 or 

 2 hermaphrodite flowers, the rachis usually produced and often bearing 1 or 

 more empty glumes above them. Flowering glumes unawned, or with 1 or 

 more terminal untwisted awns. Palea prominently 2-nerved or 2-keeIed, 

 usually as long or nearly as long as the glume. 



Sub-tribe I. — Pappophorese. Spikelet 1 or several- flowered, in a dense 

 compound head or in a spike-Hke or looser panicle. Flowering glume rounded 

 on the back, with three or more nerves leading to 3 or more terminal lobes or 

 teeth all unawned or the central one or all tapering into untwisted awns. 



Spikelets with 1 perfect flower and one or more males or empty glumes in a 

 short dense or loose panicle. Flowering glume with 9, or in extra- Australian 

 species more, plumose awns. — 36. Pappophorum. 



Spikelets several- flowered, sessile in 2 rows on one side of 1 or 2 simple 

 spikes. Lobes of the flowering glume 3, the central one alone awned. — 



33. Astrebla. 



Spikelets several- flowered, paniculate. 



Flowering glume with 3 narrow awned lobes. — 37. Triraphis. 

 Flowering glume with 3 unawned lobes or teeth. — 39. Triodia. 



Sub-tribe II. — Chloridese. Spikelets 1 or several- flowered, sessile in simple 

 secund or unilateral spikes, which are either solitary or digitate or scattered on 

 a common rachis. Flowering glumes usually keeled, entire and unawned, or 

 with 1, rarely 3, untwisted awns. 



Spikelets I-flowered, awnless, in a simple slender spike, the rachis of the 

 spikelet not produced above the flower. — 30. Microchloa. 



Spikelets 1- flowered, awnless, in digitate spikes, the rachis of the spikelet 

 not at all or minutely produced above the flower. — 31. Cjoiodon. 



Spikelets 1- flowered, awned, in a simple or in digitate spikes, with 1 or 

 more empty glumes above the flowering one.^ — 32. Chloris. 



Spikelets several- flowered, awnless or with long-pointed glumes, in digitate 

 or scattered spikes. Grain or seed within the pericarp loose and rugose. — 



34. Eleusine. 



Spikelets several or rarely 1- flowered, awnless, in scattered spikes. Grain 

 smooth, the pericarp adnate. — 35. Leptochloa. 



