Li 
SOUTH-WEST AUSTRALIAN COMPOSITÆ. co 90g 
both species, have an inane ovary, and the papus much shorter than the 
corolla. Receptacle convex. 
PopotnEca pygmea (n. sp.) : foliis linearibus; capitulis caule æquilon- 
gis (semipollicaribus) ; involucri squamis exterioribus ovatis foliaceis, 
omnibus obtusis; pappi paleis 5, basi nudis distinctis. 
Swan River, Drummond.—Whole plant scarcely above an inch high. 
DIMORPHOLEPIS, nov. gen. 
Capitulum multiflorum, heterogamum ; floribus omnibus tubulosis, pau- 
cis fæmineis marginalibus corolla tenuiore æqualiter 3-dentata, cæ- 
- teris hermaphroditis ; corolla 4-dentata. Receptaculum planum, nu- 
dum. Jnvolucrum hemisphæricum, imbricatum, disco æquilongum, 
biforme; exterius pauciseriale, e squamis scariosis ovato-lanceolatis 
marginibus dense setigero-fimbriatis, intimis breviter stipitatis ; in- 
terius uniseriale, e squamis inerassato-cartilagineis lanceolatis sessi- 
libus, marginibus subciliatis apice tenui fimbriato-laceris. Anthere - 
basi bicaudatee. Styli rami apice truncati. .4eAemia anguste ob- 
longa, erostria, subeompressa, glabra. Pappus fl. foem. minutus, se- 
tuloso-coroniformis, fl. hermaph. e paleis 3 (raro 1-2) setiformibus 
barbellato-fimbriatis summo apice acutissimis nudis corollam æquan- 
tibus.—Herba pumila annua, multicaulis, tenuiter villosa, mox gla- 
brata; caulibus 1-3-uncialibus, mono-oligocephalis, nune prolifero- 
ramosis ; foliis linearibus, alternis, summis capitulum sessile bracte- 
antibus. Involucri exterioris squame albidæ ; flores flavidi. 
D. Australis, A. Gr. in Hook. Ic. Plant. tab. 856. i 
South-western Australia, Drummond.—Also in the interior of Eastern 
Australia, at Bathurst Plains, Fraser; and Nangers, Capt. M* Arthur. 
—Stem erect or depressed-spreading. Heads 2-3 lines long. Corolla 
slender, the ampliate summit minutely four-toothed in the perfect, 
and three-toothed in the female flowers; in the latter more slender, - 
but otherwise similar, and destitute of stamens. Achenia somewhat — 
narrowed at the apex, four-nerved, the slender nerves minutely serru- 
late, scabrous under a lens, otherwise glabrous, or nearly so. Drum- — 
mond’s specimen is much condensed, the stems barely an inch high. | 
That from Captain M‘Arthur is erect, proliferously branched, and | 
about three inches high, with a foliose-bracteate head, sessile in each 
fork of the stem.—The genus is evidently allied to Panetia, Cass., and 
Chrysodiscus, Steetz, but different from both in the two kinds of invo- - 
