COMPOSITAE. 347 



Involucre not scarious. 



Pappus capillary. Tribe 8. Senecioneae. 



Pappus never capillary. 



Receptacle chaffy. Tribe 5. Heliantheae. 



Receptacle not chaffy. Tribe 6. Helenieae. 



Tribe 1. Cichorieae. Herbs, with milky juice; leaves alternate; corolla 

 strap-shaped in all the flowers of the head and all the flowers perfect. 



Genera nos. 484 to 496. 



Tribe 2. Ambrosieae. Herbs, without milky juice, monoecious or dioe- 

 cious; corollas tubular in the staminate flowers, reduced to a ring or none 

 in the pistillate flowers, never strap-shaped. Genera nos. 497 and 498. 



Tribe 3. Eupatorieae. Heads discoid, the flowers all alike, perfect and 

 tubular, never yellow; style-branches thickened upward or club-shaped, 

 obtuse, the stigmatic lines indistinct. Genera nos. 499 and 500. 



Tribe 4. Astereae. Leaves alternate; heads discoid, the flowers all alike 

 and tubular, or radiate and the outer ones strap-shaped and pistillate; 

 receptacle naked (in ours) ; anthers not caudate at base ; style-branches in 

 the perfect flowers flat. Genera nos. 501 to 510. 



Tribe 5. Heliantheae. Heads radiate or discoid; involucre not scarious; 

 receptacle chaffy; pappus never capillary, sometimes none; anthers not 

 caudate; style-branches truncate or hairy-appendaged. 



Genera nos. 511 to 520. 



Tribe 6. Helenieae. Heads radiate or discoid; involucre little imbricated, 



i not scarious; receptacle usually not chaffy; disk-flowers perfect and fertile; 



pappus a row of several chaffy scales. Genera nos. 521 to 526. 



Tribe 7. Anthemideae. Mostly strong-scented; leaves alternate; heads 

 radiate or discoid, the rays, when present, mostly white, the pistillate 

 flowers rarely tubular, the perfect flowers sometimes sterile; tegules im- 

 bricated, more or less dry and scarious. Genera nos. 527 to 533. 



Tribe 8. Senecioneae. Heads radiate or discoid, the involucre little or not 

 at all imbricated, not scarious; receptacle naked; pappus capillary; anthers 

 tail-less. Genera nos. 534 to 539. 



Tribe 9. Inuleae. Heads discoid, the pistillate flowers mostly filiform and 

 truncate; pappus capillary or none; anthers sagittate, the basal lobes 

 attenuate into tails ; style-branches with unappendaged obtuse or truncate 

 naked tips. Genera nos. 540 to 545. 



Tribe 10. Cynareae. Leaves alternate; flowers all tubular and perfect, 

 but the outer sometimes ray-like and neutral ; involucre much imbricated ; 

 pappus mostly bristly; anthers caudate, long-appendaged at tip; style- 

 branches short or united, obtuse, unappendaged, smooth, often with a 

 pubescent ring below. Genera nos. 546 to 550. 



ARTIFICIAL KEY TO THE GENERA. 



Corollas strap-shaped in all the flowers of the 

 head; plants with milky juice. 

 Pappus none. 484. Lapsana, 352. 



Pappus present. 



Pappus of scale-like or plumose bristles. 



