Eupatorium album var. subvenosum (trinerved boneset) white boneset Asteraceae EUAL2; Bx, pb(DeCandido 2001); R, c, gr;

Eupatorium album var. subvenosum New York Natural Heritage Program. 2017. (10/2018).

Eupatorium album var. subvenosum is a perennial herb, 40-100 cm tall, all parts hairy. Stems 40-100 cm tall, mostly solitary, from a short woody below-ground stem (rhizome or caudex). Branching sparcely near top  (FNA 2006).”

Leaves opposite (although some upper leaves may be alternate), almost stalkless, blade 4-13 cm long, 1-4 cm wide, elliptic, hairy, major veins 3, from base of blade (in which character it is distinguished from E. album FNA Vol 21), surface sprinkled with tiny translucent dots (use lens), margin nearly smooth to finely toothed margins, surface covered with bristles to almost smooth (FNA).

Flowers white, no rays, heads of 5 florets each 4 to 4.5 mm long; white near tips, narrow, tips long-pointed; bracteate base of each flower 0.8-1.1 cm long, bracts overlapping eventually forming 40-50 bristles (pappi); inflorescence dense, flat-topped; blooms and fruits July-Oct.

Fruit dry, small, 1-seeded, 5-angled plumed achene. 

Wetland status: UPL. 

Frequency in NYC: Rare, N YS S2S3, T. 

Origin: Native. 

Habitat: Dry, sandy soil, fill, open woods, pine-oak barrens mostly in coastal areas.