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FNA | Family List | FNA Vol. 21 | Asteraceae

416. Chromolaena de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 133. 1836.

[Greek chroma, color, and laina, cloak, evidently alluding to the colored phyllaries of some species, including the type]

Guy L. Nesom

Perennials or shrubs (sometimes scandent), 20–250 cm (fibrous-rooted). Stems erect or clambering, sparsely to densely branched. Leaves cauline; opposite [alternate, verticillate]; petiolate or sessile; blades usually 3-nerved from bases, mostly deltate to ovate or elliptic, sometimes linear, margins dentate or lobed, faces glabrous or puberulent to tomentose, sometimes gland-dotted. Heads discoid, in corymbiform to thyrsiform arrays. Involucres cylindric [campanulate to hemispheric], 2–7 mm diam. Phyllaries usually readily falling (at least in fruit), 18–65+ in 4–6+ series, 3–5-nerved, ovate to oblong or lanceolate, unequal (papery or herbaceous). Florets [6–]15–40[–75]; corollas white or purple to blue, lavender, or reddish, throats cylindric (lengths 3–4 times diams.); styles: bases not enlarged, glabrous, branches linear to linear-clavate. Receptacles flat to convex, paleate or epaleate. Cypselae prismatic, (3–)5-ribbed, scabrellous, usually gland-dotted as well; pappi persistent, of ca. 40 barbellate bristles in 1 series. x = 10.

Species ca. 165 (4 in the flora): se, sc United States, Mexico, Central America, South America (especially Brazil).

1 Leaves: petioles 0 or 0.5–1(–3) mm; blades linear-lanceolate to elliptic-lanceolate, bases tapered; apices of inner phyllaries ± spreading (pinkish purple, hyaline, petaloid, slightly expanded, truncate)   2 Chromolaena ivifolia
+ Leaves: petioles 5–20 mm; blades mostly deltate to ovate-lanceolate, bases ± abruptly contracted; apices of inner phyllaries appressed (not notably expanded or petaloid)   (2)
2 (1) Shrubs; heads usually in 3s, sometimes borne singly; involucres turbinate to campanulate   1 Chromolaena bigelovii
+ Perennials or subshrubs; heads in clusters of 5–50+ in (terminal or lateral) corymbiform arrays; involucres cylindric   (3)
3 (2) Leaf blades mostly 1.5–4 cm; involucres 5.5–7.5(–8) mm   3 Chromolaena frustrata
+ Leaf blades mostly (3.5–)5–10 cm; involucres (7–)8–10 mm   4 Chromolaena odorata

Lower Taxa


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