composityE. 51 



or tbickened lapward, minutely papillose or puberulous, or glabrous ; tbe stigmatic 

 lines only near the base and inconspicuous. Leaves eitliei- opposite or alternate. 

 Flowers never j'ellow, at most ochroleucous. 



* Akenes S-angled, destitute of intervening rilis : coroUa-lol les or teeth usually short. 

 -)— Pappus various, but never wholly capillary, sometimes obsolete or wanting, 

 •w- Involucre 5-flowered (sometimes 3-4-flowered), cylindrical, of 5 or 6 mostly equal rather 

 rigid bracts : receptacle small, naked : corolla narrow. 



4. STEVIA. Akenes linear, slender, sometimes compresseil. Pappus coroiuform-paleaceous 

 or aristiform, or composed both of awns (one or more) and short scales. 



++ ++ Involucre many-flowered, lax, of 12 to 18 herbaceous or snbmembranaceous equal and 

 nerveless bracts : receptacle naked : coroUa abruptly much dilated abme the narrow tube, 

 rose-purple or flesh-color. 



5. SCLEROLEPIS. Receptacle conical. Style-branches elongated, filiform-cla\'ate. 

 Akenes with an inane stipitiform base. Pappus conspicuous, of 5 broad and very obtuse or 

 truncate cartilaginous nerveless scales. Leaves verticiUate. 



6. TRICHOCORONIS. Receptacle convex. Style-branches comparatively short, linear, 

 flat or flattish-filiform, not enlarged upward. Akenes not contracted above the basal callus. 

 Pappus minute or small, mtdtisetulose-coroniform. Leaves opposite or alternate. 

 ++++++ Involucre many-flowered, campaimlate or hemispherical, of 2 or more series of 



striate-nerved bracts, more or less imbricated : receptacle flat or convex : corolla rather 

 narrow : akenes not stipitate-atteuuate, but with a strong basilar callus. 



7. AGER.ATUM. Involucre of mostly narrow bracts in 2 or 3 series, not conspicuously 

 unequal. Receptacle either naked or paleaceous. Pappus simple, paleaceous, and the paleaj 

 either muticous or aristate, or coroniform; the crown sometimes almost obsolete. 



8. HOFMEISTERIA. Involucre more imbricated ; outer bracts sitccessively shorter. Re- 

 ceptacle naked. Pappus of 2 to 12 slender or capillary bristles cquaUing the narrow corolla, 

 and as many or fewer alternating or exterior short and thin paleas. 



H— -)— Pappus wholly of capillary and mostly uniserial bristles ; 

 ' ++ These merely scabrous, indefinitely numerous : receptacle naked. 



9. MIKANIA. Involucre 4-flowered, composed of 4 or sometimes 8 similar and equal thin 

 bracts, with or without a loose and somewhat herbaceous subtending one. Receptacle 

 small. Stems (at least in ours) twining. 



10. EUPATORIUM. Involucre few-many-flowered, of more than 4 bracts. Xeither 

 twining nor climbing. 



++ -H- These long-plumose, rather few : receptacle naked. 



1 1 . CARMINATIA. Involucre several-flowered, cylindraceous, of several lanceolate-linear 

 3-5-striate thin imbricated bracts, the exterior shorter. Receptacle small, flat, naked. Co- 

 rollas slender, 5-toothed. Style-branches filiform, acutish. Akenes slender, narrowish at 

 the apex. Pappus of 10 to 18 bristles, which are slightly coherent at base in a single series, 

 plumose with long arachnoid hairs, deciduous together. 



* * Akenes 10-costate or striate. 

 -1— Bracts of the involucre not herbaceous, striate-nerved, conspicuously so when dry, regu- 

 larly imbricated ; the outer ones successively shorter : receptacle naked : corollas slender, 

 5-toothed at summit ; the teeth mostly glandular externally ■ pappus a single series of 

 plumose or scabrous capillary bristles : heads few-many-flowered. 



12. KUHNIA. Pappus conspicuously plumose. Bracts of the involucre narrow, in few 

 series. Leaves nearly all alternate. 



13. BRICKELLIA. Pappus from barbeUate or subplumose to merely scabrous. Leaves 

 opposite or alternate. 



-1— -i— Bracts of the involucre somewhat herbaceous or partly colored, inconspicuously when 

 at all striate or nerved, even when dry, 



++ 'Well imbricated, the outer successively shorter : leaves punctate, entire : flowers rose- 

 color, or abnormally and rarely white. 



