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Nabalus boottii - (image 1 of 5)

Taxonomy

Family: Asteraceae

Synonymous with Prenanthes bootii (DC.) D. Dietr.

Habitat

Alpine sites.

Associates

Distribution

Endemic to a few high peaks in ME, NH, VT, and Essex County NY.

Morphology

Herbaceous perennial; stems 10-30(-40) cm, glabrous below, villous puberulent above or in the inflorescence; leaves glabrous, pale beneath, entire or merely toothed, the lower with a deltoid or cordate blade 1.5-5 cm long and 1-3 cm wide, exceeded by the petiole; inflorescence narrow, somewhat thyrsoid; heads mostly nodding; involucres 8-12 mm, black or blackish-green, the pigment spots minute and usually crowded; principle bracts 8-11(-13), minutely puberulent at the tip, otherwise glabrous; some of the reduced outer bracts usually at least half as long as the main ones; flowers 9-18, whitish; pappus stramineous; achenes several-ribbed but only obscurely striate.

Notes

Flowers July to August

Wetland indicator: NA

This species is considered to be critically imperiled throughout its limited range and has a global rank of G2, with only 20 known occurrences worldwide.

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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