Eupatorium hyssopifolium hyssop-leaved boneset Asteraceae EUHY; Q, dp, i, j; K, fl, m; R, c, k, ml, sb, ty;

Eupatorium hyssopifolium plant. David G. Smith. discoverlife.org

Eupatorium hyssopifolium plant. David G. Smith. discoverlife.org (Accessed 11/1/2018).

Eupatorium hyssopifolium is a perennial herb, 30-140 cm tall, stems solitary, hairy, upper leaves with dense clusters of suppressed axillary branches.

Eupatorium hyssopifolium leaves. By Arthur Haines. Copyright © 2018.New England Wild Flower Society. gobotany.newenglandwild.org

Leaves in whorls of 3-4, almost stalkless, blades linear, 5-10 cm long, 0.5-1 cm wide, sprinkled with tiny translucent dots, margin entire.

 

 

 

 

Eupatorium hyssopifolium flowers. modified from MissouriPlants.com (Accessed 11/2018).

Flowers dull white, 5 per head, bracteate base about 0.5 cm tall, cylindrical, finely gray-hairy; inflorescence rounded; blooms Aug.-Oct.

 

Fruit dry, 1-seeded, 5-angled plumed achene; wind dispersed; winter plant with persistent, star-shaped flower-head bases (receptacle), about 0.7 cm wide (M. Gargiullo personal observation). Seeds eaten by some birds (Martin et al. 1951).

Wetland status: UPL.

Frequency in NYC: Infrequent.

Origin: Native.

Habitat: Dry sand or soil, open areas.