COMPOSITiE. 209 



3. N. altissimus Hook. : stem erect, smooth, branched ; leaves all pe- 

 ti<>ie(f, undivided, or the lower 3 — 5-cleft or parted ; the lobes or leaves acu- 

 minate, repandly toothed or denticulate ; heads in small axillary or terminal 

 clusters ; involucre 5-leaved, 5 — 6-flowered. A^. cordatus and A'. deUoideus 

 D. C. Harpalyce altissivia and cor data Don. Prenanthes altissivia and 

 cor data Pursh. 



Woods. Can. to Geor. W. to Ken. Aug., Sept. %. — Stem 4 or 5 feet high, 

 slender. Leaves sometimes cordate, deltoid or triangular-hastate. Heads nod- 

 ding, in racemes arranged in a large leafy panicle. Flowers yellowish-white. 

 Pappus dirty white. Tall Nabalus. 



4. N. virgatus D. C. : smooth ; stem simple ; leaves narrow-lanceolate ; 

 the lower sinuate or dentate, upper entire ; racemes simple, terminal ; 

 heads nodding, 8 — lO-flowered; involucre smooth, 8-leaved. Harpalyce 

 ■virgata Don. Prenanthes virgata Mich. 



Sandy fields. N. J. to Flor. Aug., Sept- %..—Stem 2—5 feet high. Heads 

 in a long terminal virgate raceme. Flowers pale purple. Virgate Nabalus. 



5. N. Fraseri D. C. : stem erect, slightly pubescent, branched ; leaves 

 mostly deltoid, 3 — 7-lobed, contracted into winged or margined petioles; 

 upper nearly sessile and undivided ; involucre smoothish, of about 8 scales, 

 8— 12-flowered. N. Fraseri, trilobatus, integrifolius and Serpeniarius, P.D.C. 

 Prenanthes rubicunda Pursh, (according to Torr. cf« Gr.) 



Dry sterile and s-andy soils. Can. and N. Y. to Flor. Aug. — Oct. Ij.. — Stem 

 2 — 4 feet high. Leaves very variable. Involucre often purplish, usually quite 

 smooth. Flowers cream-color, sometimes with a tinge of purple. Pappus straw 

 color. Very near A^. albus, and some of its forms can only be distinguished from 

 that species by its light-colored pappus. Fraser^s Nabalus. 



6. N. nanus D. C. : smooth ; stem simple ; leaves on slender petioles, 

 varying from undivided and angular or toothed to hastately or palmately 

 3-lobed or parted ; heads clustered, forming a racemose panicle ; involucre 

 10 — 15-flowered ; inner scales about 8 ; the calyculate scales very short, tri- 

 angular-ovate. (TwT, d^ Gr.) Harpalyce alba,\SiT. nana Beck Bot. \st Ed. 

 Prenanthes alba,va.T. nana Big. 



White Mountains, N. H. Big. Summit of Mount Marcy, Essex county, N. Y. 

 Torr. Aug. %. — Stem 5 — 12 inches high, smooth. Jfeads nodding. Flowers 

 whitish. Pappus straw-color. Dwarf Nabalus. 



1. N. Boottii D. C. : stem simple, pubescent at the summit ; leaves pe- 

 tioled, smooth ; lower subcordate or hastate-cordate, obtuse; the middle cor- 

 date-lanceolate ; upper linear-lanceolate, acuminate and entire ; heads in a 

 nearly simple raceme ; involucre 10 — 18-flowered ; the inner scales 10 — 15, 

 obtuse ; the calyculate scales linear, lax, nearly half the length of the 

 proper involucre. ( Torr. t|« Gr.) Prenanthes alba, var. nana Big. (inpari) 



White Mountains. N. H. Boott. Summit of Whiteface Mountain, Essex 

 county, N. Y. Torr. Aug., Sept. 1].. — Stem 5—8 inches high. Leaves variable. 

 Heads slightly nodding. Flov)ers whitish, odorous. Pappus straw-color. Dis- 

 tinguished from the preceding by the narrow loose and elongated calyculate 

 scales of the involucre. Torr. Boott's Nabalus. 



