168 S. Kurz — Contriluflons towards a [No. 2, 



+ + Eeceptacle naked. Involucral bracts herbaceous, or scarious, 

 linear. 

 f Flower-heads small, packed into dense globose or ovoid clus- 

 ters. 

 SpHiEEANTHUs. Flower-hcads in solitary terminal globular clusters. Pappus 

 none. Anthers without tails or points at the base. 



Pteeocaulon. Flower-heads sessile, in spiked clusters or rarely solitary. Pap- 

 pus of capillary bristles. Anthers with short tails or points at the base. 



t t Flower-heads separate, solitary, corymbose or panicled, 

 rarely clustered. 

 Pappus of a few rigid bristles or scales, or none. 

 Epaltes. Involucre-bracts rigid. Anthers with simple tails. Pappus of the 

 female florets none, of the sterile disk-florets small. 



O Pappus consisting of copious capillary soft bristles or 

 hairs. 

 Blumea. Flower-heads racemose, spiked or panicled. Style of the disk-florets all 

 2-cleft. Involucre bracts narrow-linear, herbaceous or thin scarious. Herbs, rarely 

 shrubs. 



Pluchea. Flower-heads corymbose. Some or all of the disk-florets sterile, with 

 a simple style. Involucral bracts rigid, often broad. Shrubs or undershrubs. 



O Anther-base obtuse, or only mucronate or acute, 

 but not tailed. 

 Subtrih. 6. ASTEROIBE^. Flower-head heterogamous radiate or discoid or 

 homogamous in absence of the ray-florets. Involucre -bracts in several or rarely only 

 2 rows. Anthers with obtuse almost entire base. Style-branches linear, more or less 

 flattened, produced beyond the stigmatic lines into lips or appendages, papillose on 

 the outside. Eeceptacle usually naked. Leaves usually alternate. 



* Female florets if present filiform or hell-shaped or 2-toothed. 



X Female florets if present filiform. Pappus bristly (Cowt/z^*^). 



MiCROGLossA. Female florets in 1 or several rows with the corollas minutely 

 ligulate, those on the disk fertile. Pappus bristles elongate. Involucre-bracts in many 

 rows. Shrubs. 



CoNYZA. Female florets in many rows with the corollas shortly filiform (rarely 

 slightly and minutely ligulate), the hermaphrodite florets mostly fertile. Achenes 

 compressed. Pappus-bristles elongate. Involucre -bracts in 2 to many rows. Herbs 

 or undershrubs. 



Thespis. Female florets in 2 to many rows, destitute of a corolla, the hermaphro- 

 dite florets sterile. Pappus-bristles short, somewhat dilated at the base. Herbs. 



X X Female florets in 2 or more rows not exceeding the disk, 2-toothcd 

 at the apex or bell-shaped. Herbs. {Granginece). 



Cyathocline. Receptacle almost contracted around the margin, raised, the disk 

 concave. Achenes not beaked, compressed, bordered with a marginal nerve. Flower- 

 heads panicled. 



GiiANGEA. Receptacle convex or conical, naked. Achenes produced into a ring or 

 neck toothed or almost bristly on the margins. Flower-heads solitary. 



DiCHROCEPHALA. Ecccptacle almost contracted around the raised margin, the 

 disk almost flat. Style-branches of the disk-florets acute. Achenes not beaked, com- 

 pressed, bordered by a nerve. Flower-heads racemose or panicled. 



