SOUTH-WEST AUSTRALIAN COMPOSITÆ. 231 
H. tenellum (n. sp.) : annua, spithamæa; caulibus simplicibus erectis 
apice nudo monocephalis foliisque filiformibus glabratis; radiis invo- 
lucri patentibus uniserialibus nitide citrinis. 
Swan River, Drummond.—Involucrum about 30-flowered, 3 lines in 
diameter, exclusive of the radiant appendages, which are of nearly the 
same length. The bristly, short hairs of the achenium are just like 
those in Lawrencella, Lindl., which are improperly called glands. They 
are the same as those of Schenia, only very much shorter. 
$2. SyNAcHYRUM. Receptaculum planum, nudum. Involucrum ob- 
ovatum, multiseriale; squamis omnibus omnino tenuiter scariosis 
albis. Achenia sericeo-villosissima. Pappus e paleis angustis 7-8 
sericeo-pubescentibus usque ad medium tubuloso-concretis superne 
attenuatis breviter plumosis corollam quasi vaginatam subæquantibus. | 
H. floribundum, DC. Prodr. vol. vi. p. 217. 
In the pappus, etc., as much as in habit, different from H. punc- 
latum and H. anthemoides, DC., which alone remain to represent the 
section SERICOPHORUM, DC., if Steetz has correctly referred the 
H. Cassinianum and H. Humboldtianum to his genus Schenia. The 
pappus consists of not more than eight thickish stout palee, which are 
concreted for half their length or more, but somewhat irregularly; 
into a tube, which is minutely hairy outside and inside; and the short 
free portions are as stout as the sete in Xyridanthe. As this concre- 
tion takes place, more or less extensively, in many true Heliptera, it 
should not be assumed here as a generic character, to separate a single | 
Species. I 
$3. Herprertpium. Receptaculum convexiusculum, alveolatum, 
alveolis integris. | Involucrum depresso-hemisphæricum, pauciseri- 
ale, vix radians; squamis glaberrimis oblongis basi chartaceo-her- 
baceis apice marginibusque tenue scariosis discum haud superantibus. - 
Flores hermaphroditi conformes, centrales ovario mani steriles. - 
. Achenia turbinata sericeo-villosissima. Pappus e setis cire. 20 ri- — 
gidis plumosis corollam æquantibus. E hu. 
H. discoideum (n. sp.): caulibus e radice annua plurimis gracilibus. 
erectis (spithamæis) foliisque spathulatis et lanceolatis viscoso-pu- 
bescentibus apice longe nudo pedunculiformi monocephalis ; invo- 
lueri patentis squamis appendice brevi scariosa deltoideo-ovata m 
peratis.— Variat a, involucro pallido; 8, involucro sanguineo. —— 
Swan River (8, Swan River to King George's Sound), Drummond. 
