SOUTH-WEST AUSTRALIAN COMPOSITAE. 267 
and a more rigid (and zot biserial) pappus, and which on the other 
hand seems to be scarcely more than a section of Helipterum, as esta- 
blished by De Candolle. But my P. gracilis is surely not generically 
distinct from P. pygmaeus, nor dissimilar in habit ; and P. ramosus is very 
closely allied to it, notwithstanding its larger and radiant involucral ap- 
pendages. I have been obliged therefore to dispose the species known 
to me as follows. 
$ I. FacELrOIDES, Capitulum 3-5-florum parvulum, intra folia in- 
volucrantia sessilia. Achenia fertilia villis sericeis confertissimis 
tecta, superioribus achenio longioribus et pappum exteriorem simu- 
lantibus; sterilia glabra vel parce villosa. Pappus corolla brevissime 
5-dentata multo longior, albus.—Nanse, capitulis paucis corymboso- 
congestis. 
l. P. pygmeus (DC. 1. c.): involucri fusci squamis intimis appendice 
lactea ovata perspicua superatis; foliis filiformi-linearibus arenoso- 
pubescentibus demum glabratis, floralibus capitulo dimidio brevio- 
ribus. 
P. australis, Nees in Linnæa, vol. xvi. p. 223. 
Interior of Eastern Australia, at Molle's Plains, 4. Cunningham, and 
Bathurst Plains, Fraser.—Heads 3 lines long, brown, the innermost 
scales of the involucre tipped with a small but conspicuous petaloid ap- 
pendage. Fertile flowers two or three; the sterile from one to three; 
both hermaphrodite, and of the same structure, except that the style is 
perhaps more developed in the former and the anthers in the latter. 
As to position, in this and other species, the infertile flowers are as 
frequently exterior as central. There are commonly two infertile 
flowers: one of them has the abortive ovary perfectly glabrous, the 
other is usually sparsely villous. These have a pappus of fewer and 
smaller rays than the fertile flowers. Pappus of the fertile achenia of 
twenty to thirty rather stout bristles, densely plumose throughout, twice 
the length of the corolla, thrice the length of the turbinate achenia, 
2. P. Drummondii (n: sp.): involucri albido-viriduli vix fuscescentis 
squamis intimis appendice minima apiculatis; foliis glabratis, florali- 
bus capitulum subæquantibus. 
Swan River, and interior of South-west Australia, Drummond, 1849. 
— Plant two inches high, very much resembling P. pygmaeus ; the cha- 
racter given above expresses the only difference. Fertile flowers two 
or three; the sterile one or two. : 
§ IL HaLrcHmxsorpEs. Capitulum 5-7-florum, parvum, basi nudum. 
