COMPOSITAE (COMPOSITE FAMILY) 



779 



Receptacle flat or nearly so. 



Achenet, cylindrical, 2-awned 56, Theleaperma- 



A.ohenea flattened parallel to the chaff. 



Pappus-awns barbed 56. Bideiis. 



Pappus-awns not barbed 54. Coreopsis. 



lieeeptacle convex to columnar. 

 Involucral bracts with thin scarious mai^ns , , . .68. Anihemis. 

 Involucral bracts distinctly herbaceous. 

 Pappus of 2 awns. 

 Pappus-awns very deciduous ... , . 51. Belianthua. 



Pappus-awns persistent 52. Aciinomeris. 



Pappus none or a crown of short teeth. 

 Bays rose-color (rarely yellow), pistillate . ^ . .47. Brauneria. 

 Ravs yellow to brownish-red or orang-e, neutral. 

 Achenes 4-siderl, mar^inless , . .... 46, Eudbeckia. 



Achenes flattened and margined .48. Lepachys, 



q. Rays pistillate and fertile r, 



r. Disk-flowers also fertile, tlieir achenes maturing- 8. 

 8. Leaves alternate. 



Pappus of 1-8 awns or teeth 68. Verheaina. 



Pappus none. 

 Heads less than 1 cm. broad ; achenes obcompressed . . 67. Achillea. 

 Heads more than 1 cm. broad ; achenes not compressed 6S. ATtthemis. 



«. Leaves opposite. 



Maritime shrub 50. BorricMa. 



Herbs. . 



Annual, with white rays 44. Eclipta. 



Perennial, with yellow rays. • 



Outer involucre of 4 connate bracts 45. Tetragonotheca. 



Outer involucral bracts not connate. 



Weak creeping herb 49. Spilanihes. 



Stout erect herbs. 



Achenes laterally flattened 58. Verbesina. 



Achenes thicklsh 48. ReliopHa. 



T. Disk-flowers not maturing achenes ; disk cha^, 

 Achenes thickish, not strongly flattened. 



Inner bracts of the involucre not armed 83. Polymnia. 



Inner bracts of the involucre gloehidiate, closely Investing' the 



achenes . , M. Acant^oapermtjm- 



AcheBes flattened dorsally, i.e. parallel with the chaff. 

 Kays 5, obcordate, scarcely exceeding the disk, whitish . . 38. Farihenittm. 

 Rays yellow, much longer than the disk. 

 Achenes wing-margined, in several rows . . . .35, Silphium. 

 Achene wingless, in a single row. 



Rays 5 ; leaves serrate 37. Ghrysogonv/m. 



Rays usually more numerous; le-aves dentate or lyrately 



lobed . .... . . 36. Berlandiera. 



Series II. All the flowers of the head with strap-shaped corolla t 



t. Pappus none. 



Leaves basal . . 90. Arnoseris. 



Leafy-stemmed. 



Involucre calyculate 



Involucre not calyculate .... 

 i. Pappus wholly or in part of scales. 



Flowers blue, rose-colored, or rarely white 



Flowers yellow 



t. Pappus bristle-formed, capillary w. 

 u. Bristles plumose. 

 Leaves basal. 

 Inner achenes long-beaked ... 



Inner achenes not beaked 94. Leontodon. 



Leafy-stemmed. 



Hispid-pubescent 95. Picv'ia. 



Glabrous 96. Tragopogon. 



u. Bristles simple, at most scabrous v. 



V. Achenes strongly muricate or epinulose above. 

 Leafy-stemmed ...... 



Achenes not muricate above w. 

 o. Achenes flat or flattish. 



Achenes beakless ; flowers 50 or more In each head, yellow . 99. Sonchus. 

 Achenes mostly beaked; heads 6-.30-flowered ; flowers yellow, 



blue, or purple 100. Laetuca. 



O, Aohenes columnar, often slender. 



Flowers cream -color, white, rose-color, or purple. 



Pappus white ; heads erect 101. Lygodesmia 



Pappup cream-color or tawny ; heads nodding . . . l^iR. Pr&nanthea. 



88. Lapmna. 



89. Serinia. 



91. Oichorium. 



92. Krigia. 



97. Chondrilla. 



98. Taraxacum 



