786 LXV. COMPOSITE. 



General involucre none or of few short scarious bracts, with or without 

 a few leafy bracts or floral leaves outside. 

 Pappus none or of 1 or more awned or jagged scales. 

 Involucre flattened, with 1 outer flat and 2 rarely 3 lateral con- 

 duplicate or concave scarious bracts, with or without 1 or 2 



inner flat ones 43. Angianthus. 



Involucre of several bracts, the inner ones broader than the outer 



ones and very deciduous 44. Gnephosis. 



Pappus of several bristles or scales, plumose-eiliate or with terminal 

 plumose tufts. General receptacle small or branched, and the 

 partial heads often rather distinct. 

 Floral leaves none or few and shorter than the heads. Involucral 

 bracts about as long as the florets, without any or with very short 

 and broad radiating tips. Pappus-bristles usually more than 6 45. Calocephalus. 

 Floral leaves several, as long as or longer than the clusters. 



Pappus-bristles 5, very elastic 46. Gnaphalodes. 



Pappus of several plumose-eiliate bristles or scales 47. Craspema: 



Pappus none or of very short scales 48. Chthonocephalus. 



SuBTEiBE IV. ilitliriziefe. — Heads heterogamous, radiate or rarely subdisciform. Florets all 

 fertile or the disk ones sterile. Style-branches truncate at the apex. 



Involucral bracts all very thin and scarious. Outer female florets 

 usually large and irregular. Aohenes sessile 49. Podolepis. 



SuBTEiBE V. Euinules. — Heads heterogamous, radiate, rarely subdisciform or homo- 

 gamous. Florets usually all fertile. Heceptacle naked. Female florets with linear style-branches, 

 rounded or dilated at the top. 



Heads discoid. Achenes slender, striate, beaked. Pappus none . . .50. Caepesidm. 



Tribe V. Kelianthoides. — Heads heteregamous, radiate or rarely discoid. Ray-florets 

 female, fertile or neuter. Disk-florets hermaphrodite, fertile or sterile, or capitular homogammis, 

 discoid, unisexual, or with all the florets hermaphrodite. Involucral bracts various. Heceptacle 

 paleaceous or rarely on the disk, under the sterile florets naked. Corolla of the hermaphrodite 

 florets tubular, regular, i to 5-cleft. Anthers appendaged at the apex, at the base entire, obtuse, 

 or scarcely tailed. Style-branches of the hermaphrodite florets truncate or appendaged. Achenes 

 various, usually compressed or angtdar. Pajyms aristate or shortly paleaceous or ivanting. 



StrETEiBE I. Anibrosiem.— Heads heterogamous or unisexual. Hermaphrodite florets 

 stenle, with undivided styles ; female apetalous. Anthers nearly free, icith infiexed appendages. 

 Male involucre gamophyllous ; female 1-flowered, the involucre closed 



over the achene, usually tuberculous 51. *Ambeosia. 



Male involucre with free bracts, 1-seriate ; female 2-flowered, 2-oelled, 



armed with numerous glochidiate prickles '52. *Xanthium. 



SUBTEIBE II. ZinnieBB.— ifeofZs heterogamous. Ray-florets female, fertile, lamina; rigid; 

 tlie disk hermaphrodite florets rarely sterile. Receptacle paleaceous. 



Eeoeptaele conical or cylindrical. Disk-florets fertile. Achenes, at least 



the interior ones, 1 to 3-aristate . 53. Zinnia. 



Shbteibe III. Verbesineae — Heads hetero- or homogamous. The hermaphrodite florets 

 all fertile. Achenes of the disk angled, subterete, or laterally compressed, crowned with 2 or 3 

 bristles or scales or naked. 



Inner involucral bracts embracing the achenes. 



Outer involucral bracts 5-glandular 54_ Sibgesbeckia 



Outer involucral bracts 4, broad, in opposite pairs .....".'.' 55.' Enhydea 



Inner involucral bracts not embracing the achenes. Palese (scales) of 



receptacle flat, narrow. Outer involucral bracts many 56. Eolipta 



Inner involucral bracts not embracing the achenes. Palere of receptacle 

 concave, embracing the achenes. 

 Bay-florets with small ligules. Achenes not winged .... 57 Blainviilea 



Eay-florets with large yellow ligules. Achenes thick .... 53' Wedelia 



Kay-florets with yellow or white ligules. Achenes ciliate 59. Spilanthes. 



Sdbteibe IV. CoreopsideBB.-Hmds hetero- or homogamous. Hermaphrodite florets all 

 fertile or neuter. Achenes dorsally compressed, 2 to i-aioned or naked. 



Outer involucral bracts few, small ; inner membranous, connate below. 

 Style branches with the ends penioillate or truncate, appendages short 

 or obsolete. Aohenes flat, margins naked, ciliate, or winged . . .60. •Coreopsis 



