Heleoch aris. CXLIII. CYPERACER. 291 
m to its orifice. No involuere except the outer empty glume, 
which takes the place of a bract subtending the spikelet and is some- 
ae BR than the other glumes, very rarely produced into a short 
y^ 
ja Wor istributed over the tro ical ana, RAEN regions of the New as well 
as de Old oe two species extending to ge Arctic circle. Of the thirteen 
Australi hree only are endemic, Ed. d ese is scarcely more than a 
variety "^ podus one, three oido are also in Now Zealand and in some temperate 
regions in the northern or southern ctos — em hitherto been only identified 
out of Australia in Fast India, the remaining six mmon tropical or temperate 
Species in the Old World ne all, o r all but one, M. jana io e 
- I. Limnocharis. Spikelets cy grin Glumes obtuse, not at all or very 
oscura ely keeled, + ether rigid, eed : hyaline border. Persistent base of the style forming 
a conical usually flat beak to the 
Stems t. erete, appe aring articulate from the transverse 
septa dividing the internal pith . 1. H. sphacelata, 
Ma gontinuous, obtusely Fail or terete. 
almost white, scarcely striate, the hyaline 
narrow x 
r ve xil soon disappeari g, the 
ment very prominent. . . . . . 2. H. spiralis. 
Glumes pale or dark, a wr ices the spiral ar- 
Ste rangement not prominent . eo... 38. A. variegata. 
ms continuous, MES cna 3- ya 4-angled . s uk. n oido H. aftHosa. 
Ping sal fe idium.  JSpikelet cylindrical or tapering upwards, usually smaller 
"a i» Limnochloa. Glumes with a distinct green centre or prominent keel. Persistent 
of the style shortly conical. 
= slender, acutely 4-angled . . . §&. H. tetraquetra. 
obtusely angled, or aa and s 
Inner [ond ct trunca t the cm with a small 
erect point. Nut E 
Spikelet pale-coloured, obtus j . 6. H. cylindrostachys. 
Spikelet usually dark ibas and rather acute : T. H. acuta. 
Inner boten oblique at the orifice without the 
pom 
gos 6 to z lines =e No hypogynous bristles. 
s ut biconvex . 8. H. atricha. 
pikelets 3 to 5 lines long. Hypogynous bristles 
usually longer than the nut. Nut 3-ribbed . . 9. H. multicaulis. 
a" . HL Heleogenus.  Spikelet ovoid-conical or small and few-flowered. 
orifice, of Pe ie ied of the style as aud depressed. — Leaf-sheath oblique at the 
Nut eres ver very smooth. Glumes deciduous, usually 
Spike de o dense, many-flowered, pale ‘coloured. Stems 
ne above 6 in. high. Glumes broad, with a 
| Spas e . 10. H. capitata. 
* loce dark-coloured, the glumes not very x 
erous, prominently keeled. ms under 3 i ip. 11. H. atropurpurea. 
Nut 3-ribbed and usually wre. fen Glumes not numero 
filiform. 
Leaf-sheath 4 
domes sie MN brown. 
Spikelet narro : A 2 E p 
