176 . COMPOSITE. 





Heads many-flowered j the flowers all tubular ; the central 

 ones perfect or sterile, few, with a five-cleft corolla ; the outer 

 ininany series, with thread-shaped truncate corollas, pistillate 

 and fertile. Involucre imbricated. Receptacle flat, tm- 

 ked. Aciienia grooved. Pappus capillary in a siDgle row. 

 — Herbs somewhat glandular, emitting a strong camphoric smell, 

 with alternate entire haves and corymbs of purple flowers. 



P. foetid A, DC Fatid Marsh Flealane. 



Nearly smooth; stem erect,, very leafy; leaves broadly lanceolate,. a r ute at each 

 end, distinctly petioled, veiny, obtusely serrate; heads numerous, in paniculate 

 c:>rymbs. 



•Open, hilly grounds and river banks, western parts of the State. Aug. Per. 

 S tm 2 to 4 feet high, sub-simple. Leaves 4 to I .inches long, \]< 2 to 3 Tide, sprin- 

 kled with minute dots, on petioles }. 2 to 1 inch long. 



Tribe IY. SEXICIOXIDE.E. The Groundsel Tribe. 



Heads' radiate or discoid ; branches of the style linear, hairy or hisped at the orex, 

 which is either truncated or produced into a conical or elongated appendage; leans 

 opposite or alternate. 



Section 1. — Htads radiate ; flowers yellowish orgreenuh. 



22. POLYMXIA, Linn.- 



Dedicated to one of the ancient Muses, for no imaginable reason. 



Heads many-flowered. Ray-flowers pistillate, ligulate, 

 in one series ; disk-flowers perfect, tubular, sterile. PiE- 

 ceptacle fiat, chaffy. Involucre double; the outer scales 

 about 5, leaf-like, large and spreading, the inner small and 

 membranaceous, surrounding the round obovoid achenia. 

 Pappus none. — Tall, branching, viscid and hairy perennial 

 herbs, with large opposite leaves, the upper lobed with dilated appen- 

 dages at the base, and light yellow heads of flowers in panicled co~ 

 rymbs. 



1. P. Canadensis, L. Leaf-cup. 



Clammy, hairy; lower leaves deeply pinnatifid, or lyrate; the uppermost triangu- 

 lar-obovate or wedge-form, shorter than the involucre. 



Moist, shaded ravines. June, July. Stem 2 to 5 feet high, roughly pubescent 

 and somewhat viscid, branching. leaves opposite or alternate, very thin, mostly 

 3 to 5 lobed at the apex. Flowers light yellow, with short rays, surrounded by the 

 concave leaflets of the double involucre, so as to form a sort of a cup, hence called 

 leaf-cup. Heads \< z inch in diameter. 



2. P. Uvedalia, L. Large Leaf-cup. 



Roughish, hairy, stout; lea vs broadly ovate, angled and toothed, nearly sessile,' 

 the lower palmately lobed, abruptly narrowed into a winged petiole; outer scales of 

 tht involucre very large ; rays 10 to 15. 



Rich -soils. Jwly, Aug. Stem 3 to 6 feet high, round. Lower katcs very large. 



