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

9. Ageratina havanensis (Kunth) R. M. King & H. Robinson, Phytologia. 19: 222. 1970.

Havana snakeroot

Eupatorium havanense Kunth inA. von Humboldt et al., Nov. Gen. Sp. 4(fol.): 100. 1818; 4(qto.): 128. 1820

Shrubs [trees], (30–)69–150(–200) cm. Stems erect (brittle), puberulent to glabrous. Leaves persistent, opposite; petioles 3–10(–15) mm; blades deltate to broadly ovate or somewhat hastate, (2–)3–5(–8) × 2–5 cm, bases truncate to cuneate, margins dentate, apices acute, faces glabrous or nearly so, eglandular. Heads clustered. Peduncles 2–14 mm, minutely puberulent. Involucres 4–6 mm. Phyllaries: apices acute, abaxial faces glabrous or nearly so. Corollas white to slightly pinkish, glabrous. Cypselae hispid. 2n = 34.

Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul. Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands; 100–900 m; Tex.; Mexico; West Indies (Cuba).

Ageratina havanensis apparently is the only species of the genus in the flora area with evergreen-persistent leaves.


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