PoLYMNiA. COMPOSITiE. 273 



71. POLYMNIA. Linn.; Gcertn.fr. t. IIA, f.2 ; DC. prodr. b. p.bl4.. 



Heads many-flowered ; the ray-flowers (5-10 or more) pistillate, in a sin- 

 gle series ; those of the disk tubular, sterile. Scales of the involucre in a 

 double series ; the exterior about 5, large and spreading, foliaceous, ovate 

 or lanceolate ; the interior smaller, membranaceous, partly embracing the 

 fertile achenia. Receptacle flat, chaffy; the cliaffscarious, lanceolate or ob- 

 long. Corolla of the disk inflated above, thin and pellucid, with 5 short 

 teeth. Style in the sterile flowers 2-cIeft ; the branches hairy. Achenia 

 glabrous, destitute of pappus ; those of the disk abortive, terete ; of the ray 

 thick, obovoid, slightly compressed laterally, wingless. — Perennial (Ameri- 

 can) herbs, usually viscid-pubescent, with an unpleasant odor. Leaves op- 

 posite, or sometimes alternate (at least the uppermost), large,^dilated, mem- 

 branaceous, variously angled, lobed, or cleft, often whh stipule-like appen- 

 dages at the base. Heads paniculate-corymbose. Flowers yellow or 

 yellowish. 



§ 1. Rays inconsjyicuous, shorter than the involucre. — Eupolyrania. (Alym- 

 nia. Neck. Polymniastrum, Lam.) 



1. P. Canaclc7isis (Linn.) : viscid-pubescent ; leaves petioled, opposite ; 

 the uppermost alternate, deltoid-ovate or rhomboidal, often 3-5-angled or 

 lobed, or somewhat hastate ; the lower deeply pinnatifid or lyrate ; involucre 

 very viscid and hairy ; the exterior scales ovate-lanceolate, acumina'e, 

 rather larger than the_ (5-8) interior ; rays obovate-cuneiform, obtusely 



3-lobed at the summit ; achenia crowned with a protuberant rins;. 



Linn. ! spec. 2. p. 926, Sf amcen. acad. 3. t. 1, /. 5 ; Lam. ill. t 711 - 

 Michx. ! fl. 2. p. 147 ; Pursh! fl. 2. p. 579; Ell. s7c. 2. p. 471 ,- Darlingt.) 

 fl. Cest. p. 476 ; DC. ! jvodr. 5. p. 515. P. variabilis, Poir. diet. 5. p. .505 ? 

 Polymniastrum, Lam. ill. t. 712 ? 



Hill-sides in sliady rich soil along streams, Canada! and Northern States! 



to the mountains of Carolina ! and west to Missouri. July.-Ausj. Stem 



2-5 feet high. Leaves very thin, pale green. Heads small. Flowers very 

 pale yellow or ochroleucous. 



§ 2. Rays flat, much longer than the involucre. — Polymnactis. (Polymnia, 

 Lam., Cass.) 



2. P. Uvedalia (Linn.) : scabrous-pubescent or somewhat hirsute ; leaves 

 opposite, triplincrved, broadly ovate or deltoid ; the lower large, nearly as 

 broad as long, palmately lobed and sinuate, abrui)lly narrowed into a winged 

 petiole ; the uppermost nearly sessile, sinuate-toothed ; involucre slightly 

 pubescent and viscid ; the exterior scales oblong-ovate, obtuse, ciliate, many 

 times larger than the (10-14) ovate-lanceolate acuminate interior ones ; rays 

 hnear-oblong, 3-toothedat the apex, thrice the length of the inner scales of the 

 involucre.— Li/m. / spec. {cd. 2) 2. p. 1303 ; Lam. ill. t. 711,/. 2 ; Michx. ' 

 fl. 2. p. 147 ; Pursh, I. c. ; Ell. I. c. ; Darlingt. I. c. ; DC! prodr. 5. 

 p. 515. Osteospcrmum Uvedalia, Linn. spec. {ed. 1) p. 923. Chrysanthe- 

 mum angulosis ])latani-foliis, &c., Pluk. aim. t. 83, /. 3. C. perenne Vir- 

 gmianum, &c., Moris, hist. 3. sect. 6. t. 7, f. 55. 



Rich dry soil. New York ! and Pennsylvania ! (rare) to Georgia ' Louis- 

 iana! and Arkansas! and Missouri! Junc-Aug.— Stem stout, grooved and 

 angled, nearly glabrous below, 4-10 ibet bigli. Lower leaves'about a foot 

 VOL. II. — 35 



