THE FLORA OF THE NOETHBRN TEERITOBY. 63 



11. CLADIUM, R. Br. 



1. C. glomeratum, R. Br. — Newcastle Range and Gilbert River, F. v. 

 Mueller. 



0. juncea, F.v. M. ; C. maniscus, R. Br. ; recorded in National Herbarium 

 Census from North Australia. 



12. RHYNCHOSPORA, Vahl. 



Hjrpogynous bristles shorter than the nut. Nut smooth, broadly obovoid, 

 with a very short beak. Stem usually above 1 ft. — 3. R. WaUichiana. 



Three at least of the bristles much longer than the nut. Nut oblong. 

 Stem usually under 1 ft. 



Spikelets 4 to 5 lines long. Nut tuberculate or hispid, the beak 

 closely sessile and often as long as the nut. Leaves shorter than 

 the stem. — 1. R. longisetis. 

 Spikelets about 3 lines. Nut smooth or nearly so, the beak short and 

 constricted at the base. Leaves often as long as the stem. — 2. 

 R. tenuifolia. 



1 . R. longisetis, R. Br. — Gulf of Carpentaria, mainland and Groote Island, 

 R. Brown ; Upper Victoria River, F. v. Mueller ; between Norman and Gilbert 

 Rivers, Gulhver. 



2. R. tenuifolia, Benth. — Victoria River, Elsey. 



3. R. WaUichiana, Kunth. — Port Essington, Armstrong. 



R. marginata, Clarke ; R. exserta, Clarke ; recorded in Kew Bulletin from 

 North Australia. 



13. GAHNIA, FoEST. 



1. O. aspera, Spreng. — ^Taylor's Range, F. v. Mueller. 



14. CAUSTIS, R. Br. 



1. C.flexuosa, R. Br. — Port Essington, Armstrong. 



15. SCLERIA, Berg. 



Series I. Axillares. — Small annuals. Spikelets small, strictly unisexual, 

 in httle axillary or terminal sessile clusters, the males with 3 flowers. — 

 8. S. pygmaea. 



Series II. Laxce. — Weak plants under 1 ft., probably annual. Spikelets 

 strictly unisexual, in axillary clusters or few in loose spikes, the males with 

 several flowers. 



Spikelets in axillary clusters. Outer persistent disk broadly cupular, inner 

 adnate, very shortly 3-lobed. — 9. S. rugosa. 



Spikelets few, small, in loose spikes. Outer disk scarcely prominent, inner 

 adnate, shortly 3-lobed. — ^5. S. laxa. 



Series III. S-ubspicatcB. — Perennials. Inflorescence scarcely branched. 

 Fertile spikelets more or less androgynous or at least with empty glumes above 

 the female flower. 



Nut tuberculate. Disk-lobes broad, membranous spreading. — 1. S. 

 Brownii. 



Nut smooth and shining. Outer persistent disk cupular, entire ; inner 

 obsolete. — 6. S. hthosperma. 



Series IV. Polysfachyce. — Perennials. Panicles branched axillary and 

 terminal. 



Spikelets unisexual, or the fertile ones androgynous. 



