GENERA AND SPECIES. 
Centipeda. 
Prostrate, lax ; leaves entire, not dilated at the base ; 
heads shortly stalked; achenes ellipsoid-clavate, 
striated ... th vad ie a ode 
Erect, rigid; leaves toothed, dilated at the base ; 
heads sessile. 
Heads almost hemispherical ; marginal flowers in 
many rows; achenes cylindric-clavate 
Heads almost semiovate ; marginal flowers in few 
rows; fruit cylindrical, striated .. 
Ceratogyne. 
Dwarf erect annual; leaves stalked; heads sessile 
axillary ... 
Ethuliopsis. 
Erect, glabrous, branched ; heads terminal and loosely 
clustered... 
Epaltes. 
Diffuse perennial; phyllaries orbicular, herbaceous ; 
leaves obovate to cana) cuneate, stalked; 
achenes glabrous 
Dwarf annual; phyllaries oval, scarious, pitialee’. opaleng 
oblong- lanceolate, sessile ; ’achenes scabrous 
Stuartina. 
Diffuse slender annual; leaves orbicular, stalked ; 
flower-heads very small in little globular clusters, 
sessile among floral leaves 
Humea. 
Leaves crowded, scale-like; flowers yellow, 4 or 5 
within each head ; achenes rough 
Leaves linear, semiterete, obtuse, clustered ; flowers 
white, 3 within each head ; achenes glabrous 
Ixodia.' 
Erect, glabrous, sticky shrub ; leaves linear-lanceolate, 
sessile or decurrent on the stem ; heads crowded in 
corymbs ... 
Elachanthus. 
Slender, dwarf, branching annual ; leaves small linear ; 
heads terminal; fertile achenes obovate, silky-hairy 
121 
orbicularis 
Cunninghamii 
thespidioides 
obionoides 
Cunninghamii 
australis 
Tatei 
Muelleri 
squamata 
cassiniacea 
achilleoides 
pusillus 
