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FNA | Family List | FNA Vol. 21 | Asteraceae | Koanophyllon

3. Koanophyllon palmeri (A. Gray) R. M. King & H. Robinson, Phytologia. 22: 150. 1971.

Palmer’s umbrella thoroughwort

Eupatorium palmeri A. Gray, Proc. Amer. Acad. Arts 21: 383. 1886

Perennials or subshrubs, 50–150 cm. Stems mostly sparsely puberulent (hairs upcurved or apically bent). Leaves opposite; petioles 0–5 mm; blades lanceolate to triangular-lanceolate, (2–)3–6 × 0.8–2 cm, bases rounded, margins shallowly serrate to subentire, apices acute (not acuminate), abaxial faces eglandular or minutely gland-dotted, adaxial sparsely strigose to hispidulous. Involucres (3–)3.5–4 mm. Phyllaries: outermost ovate-elliptic to obovate to narrowly oblong-lanceolate, puberulent, margins herbaceous, usually weakly ciliate. Corollas white, (2–)2.4–2.8 mm, lobes glandular. Cypselae 1.6–1.8 mm, sparsely hispidulous.

Flowering Sep–Nov(–Dec). Shaded rocks along streams, crevices, oak woodlands; 800–1500 m; Ariz., N.Mex.; Mexico.

Koanophyllon palmeri is native primarily to western Mexico (Sinaloa, Chihuahua, and Sonora to Durango and Jalisco; R. McVaugh 1984; B. L. Turner 1997). Similar plants (known as Eupatorium palmeri var. tonsum B. L. Robinson) occur in near-coastal localities from Michoacan to Colima, Jalisco, Nayarit, and Sinaloa, Mexico.


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