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Nabalus trifoliatus - (image 1 of 5)

Taxonomy

Family: Asteraceae

Synonymous with Prenanthes trifoliata (Cass.) Fernald

Habitat

Sandy woods, alpine sites.

Associates

Distribution

Newfoundland to MD and PA, south along the coast to NC and in mountains to NC, TN, and northern GA.

Morphology

Herbaceous perennial; stems 10-150 cm, glabrous; leaves glabrous above, often paler and hairy on the midrib and main veins beneath, the lower long-petiolate, pinnately or palmately few-lobed, usually rather deeply so, or trifoliate and again cleft, varying to less cut; inflorescence elongate paniculiform; heads nodding; involucres 8-14 mm, with (7)8(-10) principle bracts; flowers white to ochroleucous or chloroleucous or grayish; pappus stramineous or light-brown.

Notes

Flowers July to August in alpine areas, August to September elsewhere.

Wetland indicator: NA

Dwarf alpine plants have been called Prenanthes nana (Bigelow) Torr. and can be distinguished from N. boottii by the glabrous stem and peduncles and the presence of deeply lobed lower leaves; the flowers also tend to be more green or ochroleucous. Most of the pictures shown here are of such alpine plants from a site in the Adirondacks.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY
 

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