COMPOSITE. (composite FAMILY.) 273 



color. — Damp soil, Florida, and northward. Sept. — Stem 2° -4° liigli. 

 Flowers purplish. 



6. P. aspera, Michx. Hough-pubescent ; stem simple ; leaves oval-ot)- 

 loug, sharply toothed ; heads erect, clustered, forming a compound villous 

 terminal raceme; involucre of 8 or 9 hirsute scales, 12- 14-flowered ; pappus 

 straw-color. — Barrens of Tennessee, and northward. — Stem 2^-4° high. 

 Leaves small. Flowers cream-color. 



93. LYGODESMIA, Don. 



Heads 5- 10-flowered. Involucre elongated, cylindrical, of 5-8 linear 

 scales, and a few short exterior ones, lieceptacle naked. Achenia linear, 

 elongated, smooth, striate, not narrowed upward. Pappus of copious smooth- 

 isli white hairs in several rows. — Perennial smooth herbs, with linear or 

 filiform leases. Heads solitary. Flowers rose-color. 



1. Li. aphylla, DC. Stem simple or forking; lowest leaves filiform, 

 elongated ; the others remote, small, and bract like ; heads showy. — Dry 

 sandy pine barrens, Georgia and Florida. April- May. — Stem I°-2° 

 high. 



94. TARAXACUM, Haller. Dandelion. 



Heads many-flowered. Involucre double ; the exterior of small spreading 

 scales ; the interior erect in a single row. Receptacle naked. Achenia ob- 

 long, ribbed or angled, muricate on the ribs ; the apex abruptly produced 

 into a long beak Pappus of copious white hairs. — Stemless perennial herbs. 

 Scapes hollow, bearing a single head of yellow flowers. Leaves all radical, 

 oblong or lanceolate, entire or pinnatifid. 



1. T. oflB-Cinale, Weber. Leaves pinnatifid, the lobes acute, toothed ; 

 heads showy. — Damp .soil, sj)aringly naturalized. 



95. PYRRHOPAPPUS, DC. 



Heads manv-flowered. Involucre double, of numerous subulate scales ; the 

 inner ones erect and partially united, often with a callous appendage at the 

 apex. Receptacle flat, naked. Achenia oblong, nearly terete, 5-furrowed ; 

 the apex narrowed into a long filiform beak. Pappus of copious soft reddish 

 or brownish hairs. — Smootli annual herbs. Leaves oblong or lanceolate, 

 commonly toothed or pinnatifid. Heads solitary, terminating the naked stem 

 or peduncle-like branches. Flowers yellow. 



1. P. Carolinianus, DC Stem branching ; leaves lanceolate, mostly 

 toothed or pinnatifid; achenia shorter than the filiform beak. — Field.s. 

 April -July. — Stem 1° - 2° high. 



96. LACTUCA, L. Lettuce. 



Heads few- or many-flowered. Scales of the cylindrical involucre imbri^ 

 cated ; the outer ones short. Receptacle naked. Achenia compressed, smooth, 

 beaked. Pappus of copious short white hairs. — Tall biennial herbs, with 

 entire or pinnatifid clasping leaves. Heads paniculate. Flowers \vhite, pur- 

 ple, blue, or yellow. 



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