FNA: Chromolaena odorata

	Chromolaena odorata
	crucita, devil weed, Jack in the bush, siamweed
Habit	Perennials or subshrubs, mostly 80–250 cm.
Stems	erect or sprawling to subscandent, hispidulous to coarsely short-pilose.
Leaf	blades (3-nerved) narrowly lanceolate to deltate-lanceolate or ovate-lanceolate, 3–10 × 1–4 cm, margins coarsely dentate to subentire.
Petioles	5–20 mm.
Involucres	cylindric, (7–)8–10 mm.
Corollas	purplish to light blue to nearly white or slightly pinkish.
Phyllaries	in 4–6(–8) series, apices of the inner appressed, rounded to truncate (sometimes slightly white-petaloid or expanded).
Heads	usually 5–50+ in (terminal or lateral) corymbiform arrays.
2n	= 40, 60, 70.

	Chromolaena odorata
Phenology	Flowering mostly Oct–Dec, sometimes year round.
Habitat	Hammocks, thickets, pinelands, cypress-slash pine flats, canal banks, disturbed sites
Elevation	0–30 m (0–100 ft)
Distribution	FL; TX; Mexico; West Indies [WildflowerSearch map] [BONAP county map]
Source	FNA vol. 21, p. 545.
Parent taxa	Asteraceae > tribe Eupatorieae > Chromolaena
Sibling taxa	C. bigelovii, C. frustrata, C. ivifolia
Synonyms	Eupatorium odoratum, Osmia odorata
Name authority	(Linnaeus) R. M. King & H. Robinson: Phytologia 20: 204. (1970)
Web links	WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

crucita, devil weed, Jack in the bush, siamweed

Habit

Perennials or subshrubs, mostly 80–250 cm.

Stems

erect or sprawling to subscandent, hispidulous to coarsely short-pilose.

Leaf

blades (3-nerved) narrowly lanceolate to deltate-lanceolate or ovate-lanceolate, 3–10 × 1–4 cm, margins coarsely dentate to subentire.

Petioles

5–20 mm.

Involucres

cylindric, (7–)8–10 mm.

Corollas

purplish to light blue to nearly white or slightly pinkish.

Phyllaries

in 4–6(–8) series, apices of the inner appressed, rounded to truncate (sometimes slightly white-petaloid or expanded).

Heads

usually 5–50+ in (terminal or lateral) corymbiform arrays.

= 40, 60, 70.

Phenology

Flowering mostly Oct–Dec, sometimes year round.

Habitat

Hammocks, thickets, pinelands, cypress-slash pine flats, canal banks, disturbed sites

Elevation

0–30 m (0–100 ft)

Distribution

FL; TX; Mexico; West Indies

Source

Parent taxa

Sibling taxa

Synonyms

Eupatorium odoratum, Osmia odorata

Name authority

(Linnaeus) R. M. King & H. Robinson: Phytologia 20: 204. (1970)

Web links

Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).

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