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1 Heads ligulate; all florets perfect, ligulate; plant with milky juice.   Tribe. 11. Lactuceae
+ Heads radiate, discoid florets perfect, tubular or bilabiate, outer florets pistillate or neutral; plant without milky juice.   (2)
2 (1) Leaves, at least lower ones, opposite.   (3)
+ Leaves alternate.   (4)
3 (2) Heads discoid; florets white or purple, never yellow; receptacle naked.   Tribe 2. Eupatorieae
+ Heads radiate; or if discoid, then florets yellow; receptacles paleaceous.   Tribe 5. Heliantheae
4 (2) Anthers conspicuously tailed or fimbriate at base; florets all tubullar.   (5)
+ Anthers truncate, round, auriculate or sagittate, but not tailed at base.   (7)
5 (4) Style nodosely thickened below branches, often hispid; receptacle setaceous; plant (leaves and involucral bracts) often spiny.   Tribe 9. Cardueae
+ Style uniformly slender below branches; receptacle glabrous or only short hairy; plant not spiny.   (6)
6 (5) Outer florets pistillate, filiform.   Tribe 4. Inuleae
+ All florets bisexual and bilabiate or rarely with marginal florets ligulate.   Tribe 10. Mutisieae
7 (4) All florets bisexual and tubular, corolla white or purple.   Tribe 1. Vernonieae
+ Outer florets usually pistillate, ligulate or filiform, or if all bisexual and tubular, then corolla yellow.   (8)
8 (7) Receptacle with numerous long bristles; pappus of scales ending in a long awn (in all species).   Tribe 6. Helenieae (Gaillardia)
+ Receptacle without long bristles; pappus usually setaceous or reduced.   (9)
9 (8) Pappus none or of short connate scales; margins and apex of involucral bracts dry, scarious, translucent; plants mostly odoriferous.   Tribe 7. Anthemideae
+ Pappus setaceous, or of scales, if wanting then involucral bracts not as above; plants mostly inodorous.   (10)
10 (9) Style branches with a lanceolate or triangular papillose apical appendage, stigmatic lines prominent, but not reaching apical appendage; involucre of 1-several series of imbricate bracts.   Tribe 3. Astereae
+ Style branches truncate and fimbriate or otherwise, but not as above, stigmatic lines reaching apex; involucre of 1 series of equal bracts, with or without outer bracteoles (calyculate) at base.   Tribe 8. Senecioneae

List of Keys

  • List of lower taxa


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