THE FLORA OF THE NOETHEBN TERRITORY. 29 



Silky hairs long, concealing the spikelets or nearly so. 



Spikes erect. Awns prominent. 



Leaves long and broad. Stems tall and stout. — 15. A. procerus. 



Leaves flat and narrow. Spikes densely woolly. — 13. A. lanatus. 



Leaves wholly subulate or very narrow, tapering into long subulate points. 



Spikelets small. — 8. A. exaltatus. 



Spikes at length spreading or re flexed. 



Awns none or very fine and scarcely projecting. — 5. A. bombycinus. 



Hairs minute. Spikes soon re flexed. Awns very short or none. — 

 16. A. refractus. 



Peduncles axillary or terminal, bearing each a single spike above a narrow 

 sheathing bract. — 9. A., fragilis. 



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

 or less compound panicle. 



Outer glume either membranous or narrow and rigid, with two promi- 

 nent often muricate lateral nerves. (Chrj'sopogon). 



Spikelets 3 to 5 lines long, 1 fertile and 2 pedicellate ones to each 

 branch, second glume of the fertile one awned. Awn of the 

 terminal one long and rigid. — 10. A. Gryllus. 



Spikelets scarcely 1|- lines long, 1 to 3 fertile besides the pedi- 

 cellate ones on each branch, second glume awnless. — 14. A. 

 montanus. 



Spikelets 2| to 3 Unes long, 3 to 5 fertUe besides the pedicellate 

 ones on each branch. Panicle narrow, usually compact. 



Panicle 3 to 4 in. long, second glume of the fertile spikelet 



acute awnless. — 1. A. aoieularis. 

 Panicle 4 to 10 in. long, second glume of the fertile spikelet 



shortly awned. — 1. A. elongatus. 



Outer glume when in fruit hard, smooth and shining, ovate or lanceo- 

 late. (Sorghum). 



Nodes bearded. Fruiting spikelets lanceolate, 2J to 4 lines long 

 villous. Awn usually long. Ovary glabrous. — 4. A. aus- 

 trahs. 



Nodes bearded. Fruiting spikelets ovoid, 2 Unes long, some- 

 times with a short conical apex, villous. Awn not very 

 long. Ovary glabrous. — 18. A. triticeus. 



Nodes glabrous. Fruiting spikelets lanceolate, about four Unes 

 long, viUous. Awn very long. Ovary crowned by tuft of 

 hairs. — 12. A. intrans. 



1. A. acicularis, Kunth. (Chrysopogon acicularis, Trin.). — Abel Tasman 

 River, F. v. Mueller. 



2. A. affinis, R.Br. — Between Bauhinia Downs and Tanumbirini, 

 G. F. HiU (No. 820), 26/3/1912. 



A very good fodder grass. 



3. A. annulatus, Forsk. [var. macrostachya). — Red Lily Lagoon, Roper 

 River, G. P. HiU (No. 838), 7/4/1912. 



Recorded. Upper Victoria River, F. v. Mueller. 

 Good stock grass. 



4. A. australis, Spreng (Sorghum plumosum. Beauv.). — 30 miles N E. 

 Newcastle Waters, G. F. Hill (No. 503), 9/8/1911. 



Near Parson's River. G. F. HiU (No. 817), 24/3/1912. 



