THE FLOEA OF THE NORTHERN TERRITORY. 59 



Nut ^\ith distinct longitudiaal striae or ribs and transversely cancellate. 

 Spikelets numerous, under 2 lines long. — 15. F. dichotoma. 

 Spikelets about 5 or fewer, above 2 lines long. — 14. F. depau- 

 perata. Perennials, often above 1 ft. high. 

 Nut with distinct longitudinal striae or ribs and transversely rugose. Style 

 flat, ciUate. Leaves often numerous. 



Spikelets pale coloured, about 4 Hnes long. Leaf-sheaths hairy. — 40. 



F. spirostachya. 

 Spikelets usually brown, about 3 hnes. Leaves glabrous. — 16. F. 

 diphylla. 

 Nut smooth or rugose. 



Style distinctly cihate. 



Stems leafless or with few leaves. Spikelets ovate-lanceolate, 



1^ to 2 lines broad. Nuts smooth. — 18. F. ferruginea. 

 Stems leafless. Spikelets ovate or at length oblong, 1 line broad. 

 Nuts usually rugose. — 13. F. denudata. 

 Style slender, nearly glabrous. Nut minute, smooth. 



Stem leafless. Spikelets lanceolate or oblong, 4 to 6 hnes long. — 

 17. F. elata. 

 Leaves fUiform, often numerous, Spikelets ovate, 2 to 3 lines 

 long. — 6. F. csespitosa. 



Section IV. Trichelostylis. — Spikelets several, usually numerous (rarely 

 solitary in F. spiralis). Glumes imbricate all round. Style-branches 3 

 (except rarely in some Glomeratce). Nut various. 



Series I. — Oligostachyce. — Spikelets few, not clustered, occasionally solit- 

 ary, above 2 Lines long. 



Small annuals. Leaves numerous. 



Leaves setaceous. Spikelets narrow. Nuts tuberculate. — 39. F. 



spiralis. 

 Leaves Unear. Spikelets ovate, aristate. Nuts granular. — 42. F. 

 subaristata. 

 Stems long, leafless. Spikelets narrow. Nuts tuberculate. — 12. F. debihs. 



Series II. Polystachyce. — Spikelets usually numerous in more or less 

 compound umbels, not clustered on the raj^s. 

 Spikelets ovate, about 3 Hnes long or more. 



Nuts ovoid-clavate, smooth. Leaves and involucral bracts long. — 9. 



F. corjTiocarya. 

 Nuts tuberculate. Leave few. Involucral bracts short. 



Style glabrous or nearly so. Nut narrow. — 37. F. soMifoha. 

 Style cUiate. Nut broad. — 21. F. obtusangula. 

 Spikelets rarely 2 hnes long, globular ovate or lanceolate. 



Spikelets globular, f to IJ hnes diameter. Stamen usually 1. — 24. 



F. mihacea. 

 Spikelets globular, IJ to 2 hnes diam. Stamens usually 3. — 34. F. rara. 

 Spikelets ovate or lanceolate, very numerous, under 2 hnes. Stamens 

 1, rarely 2 or 3. 

 Spikelets narrow-lanceolate. 

 Leaves fairly large. — ^23. F. microcarya. 

 Leaves 5-7 cm. and 1 mm. broad. — 23a. F. Allenii. 

 Spikelets ovate or oblong. — 38. F. quinquangularis. 



Spikelets narrow, acute, 2 to 4- flowered (flowers more than 6 in aU the 

 preceding species). — 11. F. cjnperoides. 



