180 coMPOsiTiE. (composite family.) 



ers flat, smooth up to where the conspicuous marginal stigmatic lines abruptly termi' 

 nate, and prolonged above this into a tiatteucd lance-shapcd or triangular appendage 

 ■which is evenly hairy or pubescent outside. — Leaves alternate. Receptacle nalted (des- 

 titute of chaff) in all our species. 



Subtribc 1 Asterine^ Flowers of the bead all alike and perfect, or the marginal ones 

 ligulate aud pistillate. Anthers without tails at the base. 



* Eay-flowers white, blue, or purple, never yellow. 

 ■^ Pappus of numerous long and capillary bristles : receptacle flat. 



12. SERIGOCAUPUS Heads 12 - 15-fio\vered : rays 4 or 5 Involucre oblong or club-shaped, 



imbricated, cartilaginous, Achenia short, narrowed downwards, sillty. 



13. ASTEU. Heads many flowered. Involucre loosely or closely imbricated- Achenia flattish. 



Pappus simple 



14. EKIGERON. Head* many-flowei-ed. Involucre of nearly equal narrow scales, almost in 



one row. Achenia flattened Pappus simple, or with an outer set of minute scales. 



15. DIPLOPAPPUS. Heads many-flowered. Involucre imbricated. Pappus double ; the 



outer obsijuxe, of minute stiff bristles. 

 •I- -1- Pappus of very short rigid bristles, or none : receptacle conical or hemispherical. 



16. ROLTONIA, Achenia flat and wing-margined. Pappus very short. 



17. BBLLIS. Achenia marginlcss. Pappus none. Receptacle conical. 



* # Ray-flowers yellow (in one species of Solidago whitish), or sometimes none at all. 



18. BRACHYCUiETA. Heads 8 - 10-flowered, clustered : rays 4 or 5. Pappus a row of minute 



bristles shorter than tlie achenium. • 



19. SOLIDAGO. Heads few - many -flowered : rayal-16. Pappus simple, of numerous slen- 



der and equal capillary bristles. 



20. BIGELOVIA. Heads 3 -4-flowered : rays none. Receptacle awl-shaped. Pappus simple, 



a single row of capillary bristles. 



21. CHRYSOPSIS. Heads mahy-flowered : rays numerous. Pappus double ; the outer of 



very small chaffy bristles, much shorter than the inner of capillary bristles. 



Subtribe 2. Inuleje. Anthers with tails at their base : otherwise as Subtribe 1. 



22. INULA. Heads many-flowered. Kays many. Pappus capillary. 



Subtribe 3. Baccharidb^ & TARcaoNANTUEiE. Flowers of the head aU tubular, either 

 dioecious or monoecious, namely, the stominato and pistillate flowers either in different 

 heads on distinct plants, or iu the same head. Corolla of the pistillate fertile flowers a 

 very slender tube sheathing the style, and truncate at the summit. 



23. PLUCHEA. Heads containing a few perfect but sterile flowers in the centre, and many 



pistillate fertile ones around them. Anthers tailed at the base. Pappus capiUary. 



24. BACCHAKIS Heads dioecious, some aU pistillate, others aU staminate, on different plants. 



Anthers tailless. Pappus capiUary. 



Tribe IV. SXlNSCIONIDEliB. Heads various. Branches of the style in the fertile 

 flowers linear, thickish or convex eitemaUy, flat internally, hairy or pencil-tufted at the 

 apex (where the stigmatic lines terminate abruptly), and either truncate, or continued 

 beyond into a bristly-hairy appendage. — Leaves either opposite or alternate. 



Subtribe 1. MelampOdinb^. Flowers none of them perfect, but either staminate or pistil- 

 late ; the two sorts either in the same or in different heads. Anthers taiUess. Pappus, 

 if any, never of bristles. 

 * Heads containing two kinds of flowers, radiate ; the ray-flowers pistillate, the central and 

 tubular staminate flowers having a pistil, but always sterile. Receptacle chaffy. 



25. POLYMNIA. Achenia thick and turgid, roundish. Pappus none. 



26. CHRYSOGONUM. Achenia flattened. Pappus a one-sided 2- 3-toothed chaffy crown. 

 27- SILPHIUM. Achenia vei-y flat, wing-margined, numerous in several rows : rays deciduous. 

 2S. PAETHENIUM. Achenia flat, slightly margined, bearing a pappus of 2 chaffy scales and 



the very short persistent ray -corolla. 



