54 GRAMINEAE. 1. Imperata. 



FF. Spikelets in a cylindrical spike ; flowering glume 



with 3 short awns Elytrophorus 49. 



FF. Spikelets sessile in a unilateral spike ; lateral 



lobes long, rigid, with awn between them . . . Astrebla 70. 

 FF. Spikelets in a simple spike or panicle ; lateral 



lobes membranous, with a short awn Diplachne 51. 



W. Flowering glume bifid, with a long dorsal awn ; 

 spikelets panicled ; grain hairy. 

 Outer glumes enclosing the 2-3 flowers ; awn bent 



and twisted Avena 42. 



Outer glumes shorter than the 5-14 flowers ; awn 



usually straight Bromus 66. 



W Flowering glume denticulate ; awn dorsal and bent ; 



grain glabrous Amphibromus 44. 



1. Spikelets with 1 fertile flower, without any continuation of the rhachilla beyond the 

 flower, and falling off as a whole from the jointed pedicel when ripe. 



Tribe 1. — Andropogoneae. Flowering glume and palea membranous, the flowering 

 glume usually awned ; outer glumes stiff, enclosing the others ; spikelets compressed 

 dorsally, usually in articulated racemes or spikes, either bisexual, or the male and bisexual 

 spikelets mixed in the inflorescence, so that a male spikelet stands beside a fertile one ; 

 hilum punctiform. 



1. IMPERATA, Cyr. 



(After Ferrante Imperato, a Neapolitan botanist, 1550-1625.) 

 1. I. eylindrica, (L.), Beauv. A handsome perennial grass, 30-100 cm. high ; leaves 

 flat, erect ; panicle spikelike silky-white 5-20 cm. long ; spikelets 1 -flowered, usually in 

 pairs and one on a shorter pedicel ; empty glumes 3, hyaline, the 2 outer villous on back, 

 the 3rd smaller, and the flowering glume and palea smaller still ; stamens 1 or 2. — I, 

 arundinacea, Cyr. 



Adelaide Plains ; Mount Lofty Range ; Port Lincoln ; Naracoorte ; but apparently 

 rare. Aug. -Mar. 



2. POLL1NIA, Trin. 



(After Giro Pollini, an Italian botanist, 1782-1833.) 

 1. P. l'ulva, (R. Br.), Benth. Sugar-grass. A rather tall perennial, growing in tussocks ; 

 leaves flat ; ligule ciliate or glabrous ; spikes 2-4 sessile in a terminal cluster, 4-8 cm. long, 

 colored a reddish-brown by the silky hairs of the 2 lowest glumes ; spikelets in pairs, 

 both fertile ; empty glumes normally 3, the 2 outer truncate, 5 mm. long, the 3rd one 

 minute and often wanting ; flowering glume hyaline and inconspicuous except for the 

 bent and twisted awn. — Erianthus fulvus, Kunth. 



Near River Murray and in Far North. Flowering most of the year. 



3. ROTTBOELLIA, L. f. 

 (After C. F. Rottboll, professor of botany at Copenhagen, 1727-97.) 



1. R. compressa, L. f. Mat Grass. Rather rigid ascending perennial ; leaves narrow, 

 the lowest ones sometimes hairy ; spikes solitary, terminal, compressed, rigid 6-13 cm. 

 long ; spikelets in pairs, appressed in the notches of the spike, one sessile, the other 

 apparently opposite to it, because its pedicel is adnate to and appears to form part of 

 the rhachis of the spike ; both spikelets usually bisexual ; empty glumes of the sessile 

 spikelet 3, the outermost green, faintly many-nerved, rigid, acuminate, the 2nd adnate 

 to and obliterated in the rhachis, the next one thin ; flowering glume also thin and the 

 palea small ; pedicellate spikelet the same, except that the 1st and 2nd glumes are distinct, 

 rigid, green, and are rather longer (10 mm.), with subulate points; anthers purple. — 

 Hemarthria compressa, R. Br. 



In or close to rivers and streams. Jan. -March. Resembles Lepturus cylindricus, 

 but the latter has the spikelets solitary and alternate, and the nerves of the first or outer- 

 most glume are very prominent. 



4. ANDROPOGON, L. 



(Greek aner, andros, a man ; pog~m, beard ; alluding to the silky spikes. ) 

 Spikelets 1 -flowered, compressed dorsally, arranged in pairs or triplets in a racemose 

 spike or loose panicle, 1 sessile and frrtile (bisexual), the other, or 2 others, pedicellate 

 and barren (male or empty) ; empty glumes of the fertile spikelet 3, the 1st rather larger 



