226 COMPOSITE, (composite family.) 



leaves partly united below ; the interior of about 8 small cbafTy scales. Chaff 

 of the conical receptacle lanceolate, acute. Achcnia obovoid, nearly terete, 

 truncated. Pappus none. — A low hairy and clammy perennial herb, with large 

 sessile or connate, oval or oblong, coarsely toothed leaves, and largo solitary 

 heads of yellow flowers, on long peduncles. 



1. T. helianthoides, L. — Dry sandy soil, Florida to North Carolina. 

 July. — Stems several, stout, l°-lp high. Leaves 4' -6' long. Head 2' in 

 diameter. 



44. ECHINACEA, Mocnch. 



Heads many-flowered ; tlie ray-flowers pistillate, but sterile, drooping ; those 

 of the disk tubular and perfect. Scales of the involucre lanceolate, imbricated 

 in three or more rows, spreading. Receptacle at length conical. Chafl^ of the 

 reecj)tacle rigid, spine-pointed, longer than the disk-flowers. Achenia short, 

 4-sided, crowned with a <-up-shapcd toothed pappus. — Perennial sparingly 

 branched herbs, Avith alternate undivided 3- S-ribbed leaves, and large heads ter- 

 minating the pcduncle-likc summit of the stem or branches. Rays red, purple, 

 or white. 



* Rays elongated, purple or white. 



1." E. purpurea, Moench. Stem simple, or with peduncle-like branches, 

 smooth or hairy ; leaves ovate-lanceolate, serrate, rough ; the lowest ones ovate, 

 on long petioles ; scales of the involucre imbricated in 3 - 5 rows, ciliate ; rays 

 about 1 2, lanceolate, puiple. — Varies with the stem and leaves smooth ; rays 

 strap-shaped, white. — Rich woods in the upper districts. June -August. — 

 Stem 2° - 5° high. Rays 2' - 3' long. 



2. E. angUStifolia, DC. Hirsute ; stem simple ; leaves lanceolate, en- 

 tire, 3-ribbed ; the lowest tapering into a long petiole ; scales of the involucre 

 imbricated in 2-3 rows; rays 12-15, narrow, pale purple. — Prairies and low 

 barrens, Alabama, and westward. May- July. — Stem l°-3° high. Lowest 

 leaves i° long. » • 



* * Rays short, dark red. 



3. E. atrorubens, Nutt. Smooth, or rough throughout with white ap- 

 presscd hairs ; stem simple, furrowed ; leaves rigid, entire, shining ; the lowest 

 linear-lanceolate, narrowed into a petiole, 3-ribbed ; the upper few and remote, 

 linear, sessile ; scales of the involucre in three rows ; rays about 9, wedge-shaped, 

 shorter than the ovate dark purple disk ; chaff of the receptacle short-cuspidate, 

 about as long as the disk-flowers ; pappus 4-toothcd — Low pine barrens, Geor- 

 gia and Florida. June -August. — Stem 2° high. Lowest leaves ^° long. 

 Heads ^' in diameter. Plant turns black in drying. 



45. RUDBECKIA, L. 



Heads miiny flowered ; the rny-flowcrs neutral ; those of the disk tubular, per- 

 fect. Scales of the involucre in about two rows, Iciify, spreading. Receptacle 

 conical or cylindrical ; the chaff not rigid, and mostly shorter than the disk- 

 flowers. Achenia smooth, angled, truncated. Pappus a narrow border, or none. 



