22 



THE FLORA OF THE NORTHERN TERRITORY- 



2. VALLISNERIA, Linn. 



1 . F. spiralis, Linn. — Albert and Roper Rivers, F. v. M. ; Arnhem's Land , 

 R. Brown. Tape Grass. 



3. BLYXA, TH0T7. ' 



1. B. Boxburghii, Rich. — Robinson River, Gulf of Carpentaria, P. v. M. ; 

 Port Darwin, Sehultz (No. 423). 



4. OTTELIA, Pees. 



Leaf -lamina broadly cordate. Spathe winged. — 1. 0. alismoides. 

 Leaf-lamina ovate or oblong. Spathe not winged. — 2. 0. ovalitolia. 



1. 0. alismoides, Pers. — Roper River, F. v. M. ; Creeks in the neigh- 

 bourhood of Rockhampton, Bowman, O'Shanesy, Watson ; Kennedy district, 

 Daiatree. 



2. 0. ovalifolia, L. C. Rich. — Recorded. Albert River, Henne. 



GRAMINEiE. 



A. Panicaceae. Pedicel articulate below the glumes. Spikelet with one 

 fertile flower, the male or barren flower, if any, below it. 



Tribe I. — Paniceae. Fertile spikelets with one terminal hermaphrodite 

 or female flower, with or without a male one below it. Glumes 4 or 3, the upper 

 flowering one of a firmer texture, the outer one usually smaller, sometimes 

 wanting. A palea to each flower. Stamens 3, rarely fewer. Grain enclosed 

 in the hardened (rarely thin, but stiffened) upper glume and palea. Awns rare, 

 and when present neither twisted nor bent back. 



Series I. Spikelets hermaphrodite. 



Inflorescence not bracteate. No bristle-hke involucre. 



Fruiting glume hardened. 



Glumes 3 (the outer one deficient). 



Spikelets not callous at the base. Flowering glume not awned. — 15. 



Paspalum. 

 Spikelets with a callous annulus or cup at the base. Flowering glume 

 with a point or short awn. — 16. Eriochloa. 

 Glumes 4. — 17. Panicum. 



Spikelets surrounded by or intermixed with abortive branches of the 

 panicle, forming a lobed or bristly involucre. Fruiting glume 

 hardened. 

 Spikelets intermixed with long persistent bristle-like branches, and 



faUing ofi from them. — 18. Setaria. 

 Involucres crowded or distant along a simple rachis, each enclosing 

 1 to 3 spikelets and falling off with them. 



Involucres of numerous simple or plumose bristles completely 



surrounding the spikelet. — 20. Pennisetum. 

 Involucre of several outer bristles and inner fiat lobes com- 

 pletely surrounding 1 to 3 spikelets, and at length 

 hardened. — 19. Cenchrus. 

 Branches of the panicle produced beyond the base of the last spikelet. 

 Fruiting glume stiff but scarious and rather thin. 



Spikelets solitary or few along the slender inarticulate 



branches of the panicle. — ^21. Chamseraphis. 

 Spikelets few on the very short branches of a spike-Uke 

 panicle, the common rachis broad and flat, at length 

 articulate. — 23. Stenotaphrum. 



