GENERA AND SPECIES. 
Bidens. 
Glabrous perennial ; leaves bipinnate ; ray yellow 
Glossogyne. 
Glabrous perennial; leaves alternate, pinnate; achenes 
striate is i. 
Flaveria 
Glabrous annual ; leaves linear or linear-lanceolate ; ray 
yellow 
Aster. 
1. Vestiture of underside of leaves silky, cottony, 
or woolly. Ray white. 
Leaves scattered. 
Heads large solitary on long stalks or terminating 
long branchlets. 
Leaves ovate 2 to 4 in., toothed, silky below 
Leaves ovate 2 to 4 in., entire,densely cottony 
below 
Leaves oblong- ete: abou ¢ in., recurved at 
the margin, hoary above, tomentose below 
Heads small in terminal leafy racemes or panicles. 
Leaves obovate to oblong or i lla toothed, 
silky below 
Leaves narrow-linear, recurved meee woolly 
below 
Leaves clustered, small, a over } Linch; cepiren a 
the margin ; heads comparatively small, achenes 
hairy. 
Ligule of ray-flowers small or almost obliterated, 
shorter than the style; heads very small, axil- 
lary, sessile or nearly so. 
Flowers few in each head ; 
1 inch 
Flowers 10 to 15 in each Penal: Hag sta 
cuneate to linear, $ in. 
Ligule of ray-flowers developed, (Hse HAH the 
style. Heads terminating short axillary branch- 
lets, but more or less crowded in leafy panicu- 
late spikes. 
Flowers about 20 in each head. 
Leaves orbicular- to Ces analy 1 to2 
lines long 
Leaves almost peebes ne abated 4 in. long 
Leaves obovate, mostly 3-toothed, stalked 
leaves linear, + to 
bipinnata 
tenuifolia 
Australasica 
Sonderi 
pannosus 
pimeloides 
myrsinoides 
Mitchelli 
tubuliflorus 
axillaris 
microphyllus 
ramulosus 
exiguifolius 
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