218 coMPOSiTvE. (composite family.) 



clcd, the tcnnin;il ones clustered; pappus of the fertile flowers 3-4 times as 



long as the involucre. — Low ground, near the coast, Florida and northward. 



Sept. and Oct. — Shrub 2°- 12° iiigh. 



« 



2. B. glomerviliflora, Pers. Branches anf,'Kd ; leaves wedgc-obovatc, 



coarsely toothed, rigid ; the uppermost obovatc, entire ; heads very numerous, 

 in dense sessile axillary clusters ; pa])pus of the fertile flowers twice as long as 

 the involucre. (B. sessiliflora, Michx.) — Swamps along the coast, Florida to 

 North Carolina. November. — Shrub 6°- 12° liigh. 



3. B. angustifolia, Mich.x. Branches numerous, angled ; leaves linear, 

 entire ; heads single, or 2 - 4 in a terminal cluster ; achenia smooth. — Salino 

 marshes, Florida to North Carolina. Oct. — Shrub 4° - 8° high. Heads small. 



28. PLUCHEA, Cass. 



Heads many-floM'cred ; the central flowers mostly perfect, but sterile, with 

 the corolla dilated and 5-clcft; the others pistillate, slender, slightly toothed. 

 Anthers bicaudate. Scales of the involucre imbricated. Receptacle flat, 

 mostly naked. Achenia grooved or angled. Pappus a single row of capil- 

 lary slightly scabrous bristles. — Odorous mostly pubescent and glandular 

 herbs, with alternate ovate or oblong serrate leaves. Heads of purplish flowers 

 corymbose. 



1. P. bifrons, DC. Stem simple, or sparingly branched ; leaves oblong, 

 acute, denticulate, strongly reticulated and rugose, cordate and clasping ; heads 

 clustered ; involucre pubescent and viscid. (Conyza bifrons, Ell.) — Margins of 

 pine-barren ponds, Florida to North Carolina. September. — Stem l°-2° high. 

 Flowers pale purple or white. 



2. P. foetida, DC. Minutely pubescent and glandular ; leaves large, 

 membranaceous, ovate-lanceolate, acuminate, serrate, taj)ering into a petiole ; 

 corymbs axillary and terminal ; heads rather small, numerous, on slender pedi- 

 cels ; involucre smoothish, often purplish. (Conyza Marylandica, Ell.i) — 

 Damp soil, Florida, and northward. September. — Stem 2° -5° high. Leaves 

 5' -8' long, resinous-dotted. Flowers purple. 



3. P. camphorata, DC. Minutely pubescent and glandular-viscid ; 

 leaves ovate-lanceolate or oblong-ovatc, acute, denticulate, nearly ses.sile ; heads 

 rather large, in a dense eoryml), on short and stout ])e<licels ; scales of the invo- 

 lucre pubescent, the inner ones long-acuminate. — Salt marshes, Florida to 

 North Carolina. September. — Stem l°-2° high ; the branches few and erect. 

 Leaves 2' -3' long. Flowers light purple. 



4. P. purpurascens, DC. Tomcntoso and glandular ; leaves ovatc- 

 lanceolatc. acute or acuniiiiatc, sharply and somewhat croscly serrate, on slender 

 petioles ; heads rather small, on slender pedicels, loosely corymbose ; scales of 

 the involucre pid)esccnf, the inner ones lanceolate, acute. — Swamps and low 

 ground, Florida. September. — Stem l°-2° high, with numerous spreading 

 branches. Leaves 2' -4' long. Flowers bluishpurple. 



