COMPOSITJE. 433 



roTigb. Ovary I'celled ; style slender, 2-fid, arms (sometinoes con- 

 nate) linear, ^-terete, naked or externally pubescent or tipped by 

 pubescent cones, margins stigmatic ; ovule solitary, basal erect, ana- 

 tropous, nucellus with one coat. Fruit (an achene) dry, indebiscent. 

 Seed erect, testa membranous, endosperm 0, embryo straight.— Co- 

 extensive with dicotyledonous vegetation ; genera about 1,000, species 

 over 8,000. 



SEEIES I.— TUBULiPLOE..®. Flmvers all tubular, or the 

 outer only ligulate. Juice watery. 



TRIBE I.— VERNONIE^. Heads homogamous. Flowers all 2-sexual 

 and tubular, never yellow. Anthers cleft at the base (not tailed). 

 Style-arms subulate, hairy. Leaves usually alternate. 



Heads distinct, many-flowered. Pappus 

 long, copious, usually with an outer 

 row of short hairs or bristles . . 1. Veenonia. 



Heads congested, 1 -few-flowered, sur- 

 rounded by leafy bracts ; pappus of 

 4-5 bristles 2, Elephantopus. 



TRIBE II.— EUPATORIEiE. Heads homogamous. Flowers all 2-sexual 

 and tubular, never yellow. Anthers subentire at the base. Style- 

 arms obtuse, minutely papil-lose. Papjpus usually bristly. Leaves 

 opp. or the upper alternate. 



Anthers with a truncate apex . • 3. Adenostemma. 

 Anthers appendaged at the apex . . 4. Ageeatum. 



TRIBE III.— ASTEROIDE.^. Heads heterogamous, rayed or discoid, 

 or homogamous and raylesa. Anthers subentire at the base. Style- 

 arms^ flattened or planoconvex, all or those of the disk-flowers 

 terminated by a cone (trun-cate in Centipeda). DisTc-fiowers jqUow 

 (except in Cyathodine). Leaves usually alternate. 



Outer flowers of the heads fern., 2-many- 

 seriate, not longer than the disk ; pap- 

 pus 0, or (in Dicrocephala) of 2-3 

 minute bristles. 



Style-arms of disk-flowers truncate ; 

 flowers all yellow . . ,5. Centipeda. 



Style-arms of disk-flowers tipped 



with a cone. 



Achenes compressed and with a 



thickened border; cor. of 



outer flowers pink or purplish, 



of the disk yellow . . .6. Dicrocephala, 



