GENERA AND SPECIES. 
(1) Phyllaries herbaceous (also Aster tubuli- 
florus and A. axillaris). 
Pappus of simple capillary bristles; style simple 
Pappus-bristles denticulate ; ne bulbous at the 
base.. 
Pappus - ee fond 
stalked “A ; 
(2) Phyllaries, at least the inner ones, with 
short scarious radiating tips. 
Pappus-bristles barbed ; phyllaries narrow 
Pappus-bristles Looe at ; Gr with — 
points 
, plumose cies: 
(3) Phyllari ies scarious lee 
Receptacle-scales present ; BAEP -bristles ane 
or denticulate ... 
Receptacle-scales iets pappus- se oe Boosie 
Phyllaries all thin and scale-like ; ; Marginal 
flowers in 1 row, much enlarged, some- 
times ligulate. Erect herbs 
Marginal flowers in 2 rows, See 
blunt. Woolly annuals. 
Outer phyllaries scarious, the inner ones 
only at the tips; achenes narrowed "P- 
wards ... Ses 
(4) Inner phyllaries ipa! like and spr hols a0.) 
Pappus-bristles plumose from the base ... 
Pappus-bristles simple or denticulate. 
Achenes beaked ; pappus-bristles scabrous 
Achenes truncated ; bristles simple... 
Iv. Flower-heads clustered within a general 
involucre ; the partial heads also with 
involucral bracts. Leaves alternate. 
a. Partial heads without scales between the 
Jlowers, 
General involucre of many bracts in several rows. 
Bracts of general involucre with large white 
appendages forming rays ; indie -bristles 
ciliate or plumose... 
Bracts without appendages; ; pappus eine 
tary .. 
General eee rain or 8 a ee ftabiy ae 
Isoetopsis, Flaveria and Stuartina ). 
Partial heads 1- to 3-flowered, their phyllaries 
Jew, compressed, and scarious ; pappus wanting 
lll 
Pluechea 
Pterigeron 
Podosperma 
Ixiolaena 
Athrixia 
Cassinia 
Podolepis 
Gnaphalium 
Leptorrhynehos 
Helipterum 
Waitzia 
Helichrysum 
Polyealymma 
Hyalolepis 
