CAEDUACEAE. 191 



Involucres broad, many-flowered: bracts narrow, the inner broader than the 

 outer ones. Kay-flowers numerous: corollas with a slender tube and a narrow 

 pink, violet, purple, or white ligule. Disk-corollas with a funnelform throat 

 and a usually shorter tube: lobes deltoid. Anthers as long as the filaments or 

 longer. Stigmas short. Pappus of numerous capillary bristles. FLEABANE. 



Plants annual : ligules over 6 mm. long : bracts of the involucre about twice as long 

 as the disk-corolas. 1. E. annuus. 



Plants perennial: ligules less than 5.5 mm. long: inner bracts 



of the involucre slightly longer than the disk-corollas. 2. E. querrtfoUus. 



1. E. annuus (L.) Pers. Stems 3-12 dm. tall, hirsute or glabrate: blades of 

 the basal leaves oval, oblong, or ovate, coarsely toothed or incised: bracts of 

 the involucre with few long hairs: ligules of the ray pink, purplish, or rarely 

 white. Pinelands. (Ber. ) 



2. E. CLuercifolius Lam. Stems 1-7 dm. tall, pubescent: blades of the basal 

 leaves spatulate, oblanceolate, or oblong, pinnatifid or sinuate-pinnatifid : 

 involucres manifestly pubescent; inner bracts prolonged into slender tips: 

 ray-flowers numerous: disk-corollas 3.5-4 mm. long. Everglades and pine- 

 lands. (Bah.) 



16. LEPTILON Eaf. Herbs. Leaves alternate: blades narrow, entire or 

 sparingly toothed. Heads several or numerous, inconspicuously radiate or 

 discoid. Involucre usually campanulate, few-flowered: bracts very narrow, the 

 inner much longer than the outer ones. Kay-flowers few: corollas with a very 

 slender tube and a minute ligule. Disk-corollas with a campanulate or a 

 cylindraceous throat and a long tube: lobes deltoid. Pappus of many brittle 

 capillary bristles, in 1 series. 



1. L. canadense (L.) Britton. Stems 3-20 dm. tall, paniculate above, glabrate 

 or sparsely hirsute : leaf -blades spatulate to linear or nearly so, ciliate near the 

 base: larger bracts of the involucre 3-3.5 mm. long: disk-corollas 2.5-3 mm. 

 long. Pinelands, hammocks, coastal sand-dunes and waste places. F. K. 

 (Ber., Bah., Cuba, Ant.) HORSE-WEED. BUTTER-WEED. 



17. BACCHAEIS L. Shrubs. Leaves alternate: blades leathery, entire 

 or toothed. Heads dioecious, often clustered, discoid. Involucres ovoid to 

 campanulate, many-flowered: bracts of the staminate involucre smaller than 

 those of the pistillate. Corollas various, those of the staminate with a funnel- 

 form throat and a long tube, the lobes lanceolate : those of the pistillate flowers 

 filiform. Pappus of the staminate flowers shorter than that of the pistillate. 

 GROUNDSEL-TREE. 



Leaf-blades broadest above the middle. 



Leaf-blades entire. 1- B. dioica. 

 Leaf-blades toothed. 



Inner bracts of the pistillate involucres acute. 2. B. nahmifolia. 



Inner bracts of the pistillate involucres obtuse. 3. B. glomeruliflora. 



Leaf-blades linear. 4. B. angustifolia. 



1. B. dioica Vahl. Shrub 8-25 dm. tall: leaf -blades spatulate, often broadly 

 so, to obovate-spatulate, 1-3 cm. long: pistillate involucres with ovate-obtuse 

 outer bracts and linear-lanceolate acuminate inner bracts. Coastal hammocks 

 below Miami. (Bah., Cuba, Ant.) 



2. B. halimifolia L. Plants 9-40 dm. tall, resinous: leaf -blades suborbicular 

 to oblong or linear-elliptic, some of them, at least, coarsely toothed: pistillate 

 involucres about 6 mm. long; inner bracts linear. Coastal hammocks and 

 sand-dunes. F. K. (Bah.) 



