COMPOSITE. (COMPOSITE FAMILY.) 189 



than the heads ; scales of the involucre slightly hairy. Damp shady soil, Flor- 

 ida to Mississippi, and northward. July and August. Stem l-2 high. 

 Leaves 3' -6' long, 2' -4' wide. Flowers purple. 



2. E. tomentOSUS, L. Eough-hairy ; stem nearly naked ; radical leaves 

 spreading, obovate-oblong, narrowed into a petiole; stem-leaves (1-2) small, 

 lanceolate ; bracts ovate or cordate, usually shorter than the heads ; scales of 

 the involucre very hairy. (E. nudicaulis, Ell.) Dry sandy soil, Florida to 

 North Carolina, and westward. June- August. Stem l-2 high. Eadical 

 leaves 4' - 10' long, 2' wide, spreading on the ground. Flowers pale purple. 



4. PECTIS, L. 



Heads several-flowered, radiate. Rays pistillate. Disk-flowers somewhat 2- 

 lipped, perfect. Involucre cylindrical. Scales 5 - 8, in a single row. Recepta- 

 cle naked. Branches of the style short, obtuse. Achenium linear. Pappus 

 composed of about five unequal bristle-pointed scales. Chiefly annuals. 

 Leaves opposite, glandular-dotted, bristly on the margins. Flowers small, 

 yellow. 



1. P. linifolia, L. Stem diffusely branched (6'- 12' high) ; leaves linear, 

 connate ; heads small, on long and slender bracted peduncles ; scales of the in- 

 volucre slightly produced at the base ; achenia hairy. South Florida. 



TRIBE II. EUPATORIACE^E. Heads discoid,- the flowers all tubular and 

 perfect .- branches of the style, usually elongated, club-shaped, minutely pubescent ; 

 the stigmatic lines obscure. Flowers white, blue, or purple. 



5. CCELESTINA, Cass. 



Heads many-flowered. Involucre nearly hemispherical ; the scales numerous, 

 imbricated. Receptacle naked or chaffy. Achenia 5-angled. Pappus cup- 

 shaped, truncate or more or less prominently toothed. Leaves opposite, toothed. 

 Heads in close corymbs. Flowers blue or purple. 



1. C. maritima, Torr. & Gray. Stem diffuse, somewhat shrubby at the 

 base, smooth ; leaves ovate, abruptly contracted into a slender petiole ; corymbs 

 few-flowered ; receptacle naked ; pappus a whitish truncated margin. South 

 Florida. Stem 1 - 2 long. Flowers blue. 



6. AGERATUM, L. 



Receptacle always naked^ Pappus composed of 5-10 distinct scales. Oth- 

 erwise like Coelestina. 



1 . A. COnyzoides, L. Leaves ovate, rhombic, or cordate, on rather long 

 petioles ; scales of the pappus 5, slightly serrate, awn-pointed from a broad base. 

 Wet places near Savannah, Georgia. May. Pubescence and form of the 

 leaves variable. Flowers white or blue. 



