A Revision of the Western Australian Species of Tmod t a R.Br. 2o 
trilobata 
lineares 
; lobi acuti, ciliolati, subaequales vol medii longiores, nervosi. 
5—6 mm. longae, basi pubescentes, bicarinatae ; alatac*. 
Paleae 
(PI. II., 
%. 5.) 
This grass forms a very dense hemispherical, greyish tussock 40-50 cm. 
in diameter. It prefers rocky slopes and is found on arid hills in the Pilbara 
district. It is easily distinguished from T. irritans by the glaucous leaves, 
the loose panicle in which the comparatively few spikelets are apt to hang 
down resembling those of Briza maxima, the acute lobes of the lemmas and 
the winged nerves of the paleas. These wings commonly protrude beyond the 
margin of the lemma in the spikelets. 
The species is of no pastoral importance. 
Distribution. -Gorge Range (between Shaw and Coongan Rivers), Burbidge 
792 (type !) ; Kitty’s Gap (between Coongan River and Bamboo Creek), Bur- 
bidge 979 and 984. 
Triodia irritans R.Br. in Prodr. FI. Novae Holl. 182 : 1810 ; Festuca 
irritans F. Muell. Veg. Chath. Isl. 59. Fragm. viii. 129 : 1874. 
A perennial grass forming dense tussocks. Culms ascending, quite glabrous, 
internodes short, branching from the upper nodes. Leaves glabrous ; ligule 
a row of short hairs, the auricular ridges of the sheaths very short and bearing 
hairs longer than those of the ligule ; blades co ndu p 1 ic ate , 8-16 cm. long, 
very pungent pointed. Panicle 10-20 cm. long with spikelets on capillary 
peduncles along the branches : the spikelets 10-18 mm. long, 3-8 mm. wide. 
Glumes 6-9 mm. long, subequal, scarious or becoming indurate, 1-5 nerved 
(usually the lower glume three-nerved and the upper five-nerved), the mid 
nerve prominent, lanceolate, acuminate or acute, minutely scabridulous. 
Lemmas 5-10, the lower 3-4 fertile, lanceolate with a ragged obtuse apex com- 
posed of three very short lobes of which the lateral ones are membranous 
and the medial one a prolongation of the mid-nerve. The medial lobe may be 
longer or shorter than the lateral lobes. There are nine nerves in groups of 
three, each being associated with a lobe, the nerves visible almost to the 
base of the lemma, which is clothed on the lower abaxial and marginal sur- 
face with silky hirs. The lowest lemma 5-8 mm. long. Palea linear or slight- 
ly oblanceolate, obtuse, shorter than the lemma or almost as long, glabrous 
or pubescent in the lower half, the nerves scabrid. (PI. 2, fig. 6.) 
A Buck Spinifex” which is associated with the arid portions of the 
southern interior. The Kalgoorlie specimen has a narrower panicle and smaller 
spikelets than the other specimens but seems hardly distinct enough to separ- 
ate as a variety. Further collections may serve to elucidate the point. 
Distribution. — Aleekatharra, C. A.. Gardner ; ( oorow , Gaidnei , 20 
miles east of Mount Holland, Gardner ; Kalgoorlie, Gardner ; near Fraser 
Range, Gardner 2851a. 
Triodia Fitzgeraldii N. T. Burbidge sp. nov. ; Triodia Fitzgeraldii C. A. 
Gardner ms. ; affinis T. longicepti J. M. Black sed spiculis minoribus, lemma- 
tibus scariosis, lobis acutis, vaginarum marginibus hirsutis differens. 
Gramen perenne, eaespitosum. Culmi erecti, rigidissimi, nodis superior- 
ibus ramosi, glabri, laeves, multis nodis ; internodia brevia. Folia rigida ; 
vaginae imbricatae, pubescentes vel glabrescentes, marginibus et orifice 
hirsutis ; ligulae ad seriem ciliorum redactae ; laminae angustiores vaginarum, 
rigidae, conduplicatae, glabrae, minute striatae, breviter petiolatae, 9-20 cm. 
