Ageratina wrightii

(A. Gray) R. M. King & H. Robinson

Phytologia 19: 228. 1970

Common names: Wright’s snakeroot
Basionyms: Eupatorium wrightii A. Gray Smithsonian Contr. Knowl. 3(5): 87. 1852
Treatment appears in FNA Volume 21. Treatment on page 552. Mentioned on page 548.
Shrubs, 50–150 cm. Stems erect, puberulous. Leaves opposite proximally, alternate on distal 1/3–1/2 of stem; petioles narrowly winged, 3–5(–8) mm; blades ovate to deltate-ovate, mostly 1–2 × 0.5–1.5(–2) cm, bases truncate to cuneate or attenuate, margins entire or shallowly crenate, apices acute to blunt or obtuse, abaxial faces gland-dotted. Heads clustered. Peduncles 1–3 mm, puberulent. Involucres 3.5–4.5 mm. Phyllaries: apices acute, abaxial faces puberulent. Corollas pinkish white to pink, glabrous. Cypselae sparsely hispidulous.

Phenology: Flowering (Jul–)Aug–Oct(–Nov).
Habitat: Limestone slopes, ledges, alluvium, in brushy vegetation
Elevation: 1300–2200 m



Ariz., N.Mex., Tex., Mexico.


Selected References


Lower Taxa