276 THE FLOEA OF THE NOBTHERIT TBRRITOBY. 



Section II. Eyrea. — Flower-heads broad or hemispherical. Involucral 

 bracts narrow. — 1. P. Eyrea. 



1. P. Eyrea, F. v. if.— Hermansburg, Finke River, G. F. Hill (71), 

 11/3/1911. 



Recorded. Islands of the Gulf of Carpentaria, R. Brown ; Amhem's 

 Land, F. v. Mueller ; Nichol Bay, F. Gregory's Expedition. 



Var. major.— Ca.mp III., Lander Creek, G. F. Hill (307), 11/3/1911. 



2. P. indica, Less. — Islands of the Gulf of Carpentaria and the opposite 

 mainland, R. Brown ; Port Essington, Armstrong. 



3. P. tetranthera, F. v. M. — Victoria, Flinders, and Van Alphen Rivers, 

 F. V. Mueller. 



p. baccharoides, F. v. M.; P. squarrosa, Benth. — Recorded from North 

 Australia in NationaL Herbarium Census. 



11. PTERIGERON, A. Gr., 1852. 



(Oliganthemum, F. v. M., 1859 ; Streptoglossa, Steetz., 1863.) 



Flower-heads large, almost hemispherical. 



Ray-florets ligulate, exceeding the involucre. 



Leaves ovate, decurrent. Ray-florets not J line broad. — 1. 



P. decurrens. 

 Leaves narrow or obovate, not decurrent. Ray-florets fuUy 

 ^ line broad. — 2. P. liatroides. 

 Ray-florets very slender, about as long as the involucre. Leaves 

 oblong, stem-clasping or slightly decurrent. — 3. P. maero- 

 cephalus. 

 Flower-heads ovoid. 



Leaves decurrent. Ray-florets about as long as the involucre. — 



5. P. odorus. 

 Leaves not decurrent. Ray-florets very slender and shorter than 

 the involucre. — 4. P. microglossa. 



1. P. decurrens, D. G. — ^N.W. Coast, Bynoe ; Nichol Bay, F. Gregory's 

 Expedition. 



2. P. liatroides, Benth. {var. humilis, Benth). — Strangways River, M'Douall 

 Stuart's Expedition. 



3. P. macrocephalus, Benth. — Gulf of Carpentaria, F. v. Mueller ; in the. 

 interior, lat. 19 degrees 32 minutes, M'Douall Stuart's Expedition. 



4. P microglossus, Benth. — Sturt's Creek and Fitzmaurice River, F. v. 

 Mueller. 



5. P odorus, Benth.— m miles N.W. of Camp III., G. P. Hill (No. 356), 

 15/6/1911. 



Recorded. Victoria River, F. v. Mueller. 



Var. major, Benth. — Roper River, Gilruth and Spencer, July- August, 1911. 

 Recorded. Albert River, F. v. Mueller. 



P. adscendens, Benth. ; P. filifolius, Benth. ; recorded from North Aus- 

 tralia in National Herbarium Census. 



12. THESPIDIUM, P. v .M. 



1 . T. basiflorum, F. v. M.- — Islands of the Gulf of Carpentaria, R. Brown ; 

 Port Essington, Armstrong ; Upper Gilbert River, F. v. Mueller. 



