40 THE FLORA OF THE NOBTHBBN TBRBITOEY. 



21. CHAMAER APHIS, R. B. 



Panicle spreading, with distant spikelets on filiform branches. Fruiting 

 glume short and obtuse, — 2. C. spinescens. 



Panicle spikelike and close, the spikelets all solitary at the base of the long 

 awnlike branches. Fruiting glume acuminate. Outer glume scarcely promin- 

 ent, callous and truncate. — 1. C. hordeacea. 



1. C. hordeacea, R. Br. — Islands off the North Coast, R. Brown. 



2. C. spinescens, Poir. — Var. parvispicula, Benth. — Islands of the Gulf of 

 Carpentaria, R. Brown ; between the Norman and Gilbert Rivers, Gulliver. 



22. XEROCHLOA, R. Br. 1810. 



Spikelets glabrous. — 2. X. imberbis. 



Pedicel second glume and palea of the third glume densely bearded, at 

 least in the upper spikelets. — 1. X. barbata. 



Pedicel second glume and palea of the third glume covered with long 

 intricate woolly hairs. — 3. X. laniflora. 



1. X. barbata, R. Br. — Carrington's Landing, MacArthur River, G. F. 

 Hill (No. 594), 20/9/1911. 



160 miles W. of Camp IV., G. F. Hill (No. 422), 3/7/1911. 

 Recorded. Islands of the Gulf of Carpentaria, R. IBrown ; Albert River, 

 Henne. 



2. X. imberbis, E. Br. — Islands of the Gulf of Carpentaria, R. Brown ; 

 Cygnet Bay, A. Cunningham ; Victoria River and Sturt's Creek, F. v. Mueller ; 

 Port Darwin, Schultz (No. 337). 



3. X. laniflora, Benth.-^O miles N.W. of Camp IV., G. F. Hill (No. 381), 

 24/6/1911. 



Recorded. Sturt's Creek, F. v. Mueller. 



23. STENOTAPHRUM, Trin. 



1. 8. americanum, Schrank {S. dimidiatum, Trin.). — ^N.W. Coast, Wick- 

 ham ; Foul Point, A. Cunningham. Buffalo grass. Useful as a coarse lawn 

 grass in hot climates, but browned by frost, and a low-grade pasture plant. 



24. THUAREA, Pers. 

 1. T. sarmentosa, Pers. — Amhem North Bay, R. Brown. Beach grass. 



25. SPINIFEX, Linn. 1771. 

 {Ixalum, Forsf., 1786). 

 Heads of spikelets several inches in diameter. Male spikelets in spikes 

 of Itoljin. Females at the base of rigid rachises of 3to4in. — 1. S. longifohus. 

 Heads of spikelets not above 1 in. diameter. Male spikelets sohtary or 

 clustered within small bracts. Females within broad bracts, the rachis shorter 

 than the spikelets and sometimes minute or obsolete. — 2. S. paradoxus. 



1. S. longifolius, R. Br. — Islands of the Gulf of Carpentaria, R. Brown ; 

 Careening Bay, A. Cunningham ; Quail Island, Flood ; Nichol Bay, Walcot ; 

 Port Darwin, Schultz (Nos. 199, 200). 



2. S. paradoxus, Benth. — Hermansburg, Finke River, G. F. Hill (No. 82) 

 12/3/1911. Both coarse spiny drought-resistant grasses of shght pasture 

 value. 



