

COMPOSITE. 167 



, ri 



ted. Florets indefinite. Stigmas filiform, somewhat hispid. 

 Acines narrow, angled, sulcate, simple at the apex. Pappus 

 pilose, stiffly erect, fragile, persistent and coloured, with the 

 rays crowded in a double row, denticulate- scabrous. 



Syngenesia. JEqualis. 



1. H. altissima Don: stem branching; leaves 3-lobed, petioled, 

 angular, denticulate, scabrous on the margin ; racemes axillary ; flow- 

 ers nodding ; involucre about 5-flowered. Prenanthes altissima Linn. 

 Pursh. 



HAB. Woods. Can. to Car. Aug. If. Stem 4 6 feet high, 

 branching, glabrous. Flowers in axillary panicles or racemes, 

 yellowish. 



2. H. cordata Don : stem paniculate above ; leaves petiolate, cordate, 

 toothed, ciliate ; the floral ones sessile, oblong, very entire ; panicle 

 loose, with the flowers somewhat racemose and nodding ; involucre 

 6-leaved, 6 -8-flowered. Prenanthes cordata Pursh. 



HAB. Woods. N. Y. to Car. Aug. 2J..Stem 46 feet high. 

 Leaves ovate-lanceolate, cordate. Flowers in long loose pani- 

 cles, yellowish. 



3. H. virgata Don : smooth ; stem simple ; leaves all lyrate and 

 sinuate, sessile ; racemes generally secund ; flowers pendulous ; invo- 

 lucre 8-leaved, 10-flowered. Prenanthes virgata Mich. 



HAB. Sandy fields. N. J. to Car. Aug., Sept. U- Stem 2 5 

 feet high. Ftowers in a long terminal raceme, pale-purple. 



4. H, alba Don : radical leaves angular-hastate, toothed and some- 

 what lobed ; stem-leaves roundish-ovate, toothed and petioled, the 

 upper ones lanceolate ; panicle loose ; fascicles terminal, nodding ; 

 involucres 8-leaved, 9 12-flowered. Prenanthes alba Linn. 



b. nana : stem low ; lower leaves 3-parted ; middle ones hastate, 

 upper ones ovate or lanceolate ; sometimes all are entire. P. 

 alba var. nana Big-. Torr. 



HAB. Woods. N. Y. to Car. Aug. If. Stem 5 feet high. 

 Flowers in a loose panicle which is composed of small terminal 

 clusters, yellowish-white. Var. b. White mountains. Stem 

 4 15 inches high. Flowers in simple or panicled racemes, 

 purple. 



5. H. serpentaria Don : leaves toothed, rough ; those of the root pal- 

 mate ; of the stem on long petioles, sinuate-pinnatifid, somewhat 3- 

 lobed, the middle segment 3-parted ; upper leaves lanceolate ; racemes 

 terminal, paniculate, short, nodding; involucre 8-leaved, 12-flowered. 

 Prenanthes serpentaria Pursh. 



HAB. Mountain woods. N. Y. to Car. Aug. If. Stem2 4 feet 

 high, nearly glabrous. Flowers in loose terminal panicles, purple. 

 Resembles H. alba, and by Dr. Torrey is placed as a variety 

 of that species. The whole genus, indeed, is so liable to varia- 

 tion, that it may be doubted whether many of the species usual- 

 ly considered distinct, are more than mere varieties. But a* 



