3C ANALYSIS. 



(g) Capitulum many flowered. Florets all tubular, outer ones fertile, slen- 

 der ; inner ones stamiiate, or perfect, 5-touthed. 

 Genus. Pterocaulon p. 169. 



(7i) Capitulum many flowered. Ray florets ligulate, pistillate. 

 Genus Buphaihalmum p. 172. 



(t) Capitulum many flowered. Ray florets in one series, pistillate, disk 

 florets tubular, 4-tooihed, perfect. Pappus usually none. Leaves opposite. 



Genera Eclipta p 171. Siegesbeckia p. 189. 



Tribe 4. Senicioidece. Style cylindrical at the apex. In perfect flowers 

 bifid, with the divis ons elo'^gated, linear, pencillate, sometimes truncate, at 

 others protiuced beyond the pencil into a short cone or narrow, hispid appen- 

 dix. Stigniatic surface broad, and prominent, extending to the pencil, or to 

 the origin of the cone or appendix. Corolla of the disk pellucid, regular 

 Pollen globose, echinate. 



Sub-Tribe 1. Melampod'inecB. Flowers monoecious or dioecious, never per- 

 fect. Anthers not acuminate. Receptacle usually chaffy. Pappus never 

 setaceo «s. 



Genera. Chrysogonum p. 198. Silphium p. 196. Polymnia p. 197. 

 Xanthium p. 200. Ambrosia p. 200. Iva p. 199. Parihenium p. 199. 



Sub-Tribe 2. Helianihece. Capitula either heterogamous and radiate, or 

 perfect and discoid. Receptacle all chaff"y, or only the margin. Lobes of. 

 the perfect flowers thick. Pappus none, a margin or awns. Anthers black- 

 ish, not acuminate. Leaves often opposite. 



Genera, iVIeiananthera p 1S7. Heliopsis p. 183. Tetragonotheca p. 189. 

 Rudbeckia p. 194. Coreopsis p. 192. Helianthus p. 189. Actinomeris p. 

 189. BiJens 192. Verbesina p. 199. Acmella p. 183. 



Sub-Tribe 3. Hehniem. Capitula often heterogamous, radiate. Ray flo- 

 rets ligulate, pistillate, or neutral, in one series. Disk florets usually perfect. 

 Anthers often dark colored, with the base somewhat produced, not acumi- 

 nate. Branches of the style someUmes truncate at the summit, at others ex- 

 tended by a cone or appendix above the hairs. Pappus paleaceous, many 

 leaved, in one series, scarious; sometimes by abortion wanting. 



Genera, (iaillardia p. 327; Baldwina 194. Leptopoda p. 194. Hymeno- 

 pippus p. 137. Polypteris p. 186. Helenium p. 183. Marshallia p. 187. 



Sub-Tribe 4. Anlhemidece. Capitula usually heterogamous, never dioe- 

 cious. Ray florets usually in one series, pistillate or neutral, ligulate, or if 

 tubular, bilabiate- Disk florets tubular, 4-5-toothed, usually perfect. Branch- 

 es of the style bearded, and truncate a* the summit, in a few cases extended 

 into a cone. Pappus usually wanting, or a margin. Leaves usually alternate. 



Genera Antliemis p. 198. Achillea p. 199. Santolina p. 198. Chry- 

 santhemum p. 183. Artemisia p. 198. Gymnostyles, or SUlva p. 172. 



Sub Tribe 5. Capitula homogamous, or heterogamous. Corolla tubular, 

 5-too;hed, dicecious, or with the exterior florets pistillate, and the central ones 

 perlcjt. Anthers acuminate. Pappus pilose, or setaceous, sometimes cla- 

 vate. Plants usually covered with a soft pubescence. 



Ge:iera. Gnaphaiium p. 169. Antennaria p. 169. 



Sub-Tribe 6. Seneclo:ii(B. Capitula homogamous or heterogamous, never 

 dicecious; discoid, or radiate. Receptacle naked. Anthers not acuminate. 

 Pappus pilose or setaccus. Leaves alternate. The exterior seeds clavate. 



Genera. Arnica p. 170. Cacalia p. 185. Senicio p. 186. 



Tribe 5. Girduacefe, or CynnrccB. Florets all tubular, perfect, or with the 

 ray florets pistillate, and of the disk staminate. Receptacle chaflTy. Stigma 

 articulated. Leaves alternate, often spiny. 



Genera. Cnicus p. 140. Carduus, or Cirtium. Centauria p. 141. 



Tribe 6. MutUiaceee. Capitula heterogamous Ray florets in a double 

 series, the inner series pistillate, with l)ng stjles; disk florets staminate, bila- 

 biate. Receptacle naked. Pappus pilose. 



Genus. Chaptalia p. 187. 



