66 THE FLOEA OF THE NORTHERN TERRITORY. 



Spikes usually ovate or broad, the outer bracts hispid, with long spreading 

 hairs. Inner scales prominent. — 2. C. exserta. 



1. G. Banksii, Boem and Schult. — Victoria River, F. v. Mueller. 



2. C. exserta, Roem. and Schult. — Melville Island, Gilruth and Spencer, 

 July-August, 1911. 



Recorded. Providence Hill and M'Adam Range, F. v. Mueller. 



XYRrDACE.a;. 



1. XYRIS, Linn. 



Leaf-tufts on a perennial stock, with rigid sheathing bases. Staminodia 

 densely penicillate. — 1. X. complanata. 



Leaf-tufts annual. Leaves grass-hke. Staminodia very slender, with few 

 hairs or scarcely any. — 2. X. pauciflora. 



1. X. complanata, R.Br. {X. elongata, Rudge). — Islands of the Gulf of 

 Carpentatia, R. Brown ; Bathurst Island, A. Cunningham ; Sea Range and 

 Victoria River, F. v. Mueller ; Port Darwin, Schultz (No. 128). 



Hatpin grass. 



2. X. pauciflora, Willd. — ^M'Adam Range and Victoria River, F. v. 

 Mueller ; Port Essington, Armstrong. 



ERIOCAULACE.ffi. 



1. ERIOCAULON, Linn. 1742. 



{Chaetodiscus, Steud., 1855; Electrosperma, F. v. M., 1854; Lasuolepis, 

 Boeck., 1873 ; Leucocephala, Roxb., 1832 ; Nasmyihia, Huds., 1862 ; Bandalia, 

 Beauv., 1828 ; SpTiaerochloa, Beauv., 1828). 



Series I. Flowers 3-merous or rarely partially 2-merous by abortion, 

 especially the females. 



Submerged stems elongated, densely covered with filiform leaves. Flower 

 heads pubescent, at least at first. — 10. E. setaceum. 



Scapes and radical leaves under 6 in. and often much less, glabrous. 



Flower-heads glabrous. Bracts with their tips incurved and appressed. 

 Outer female perianth segments linear, 3 or fewer or none. 



Outer male perianth segments united in a spatha-like scale. 



— 1. E. cinereum. 

 Outer male perianth segments linear or oblong-spathulate, 

 free or nearly so. 

 Outer female perianth segments hnear, inner none. — 7. 



E. nigricans. 

 Outer female perianth segments linear, inner perianth 

 segments narrow-linear. — 4. E. graphitinum. 

 Outer female perianth segments 2, complicate and winged. 

 Inner female perianth segments 3, oblong. Ovary 3- 



merous. — 5. E. lividum. 

 Inner female perianth segments 2, linear-oblong. Ovary 

 2-merous. — 2. E. concretum. 

 Flower-heads glabrous. Bracts with spreading tips. 



Bracts pale-coloured, obtuse qr obtusely-acuminate. Female 



perianth-segments 6, nearly similar. — ^9. E. Schultzii. 

 Bracts dark-coloured, cuneate with a rigid spreading point. 

 Receptacle villous. — 12. E. tortuosum. 



