Chromolaena

de Candolle in A. P. de Candolle and A. L. P. P. de Candolle

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

Etymology: Greek chroma, color, and laina, cloak, evidently alluding to the colored phyllaries of some species, including the type
Treatment appears in FNA Volume 21. Treatment on page 544. Mentioned on page 461, 462, 481.
 TaxonIllustrator 
FNA21 P82 Koanophyllon villosum.jpegKoanophyllon villosum
Chromolaena ivifolia
Mikania scandens
Linny Heagy
Linny Heagy
Linny Heagy

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 glanddotted. 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 glanddotted as well; pappi persistent, of ca. 40 barbellate bristles in 1 series. x = 10.

Distribution

se, sc United States, Mexico, Central America, South America (especially Brazil)

Discussion

Species ca. 165 (4 in the flora).

Selected References

None.

Key

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) Chromolaena ivifolia
1 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 Shrubs; heads usually in 3s, sometimes borne singly; involucres turbinate to campanulate Chromolaena bigelovii
2 Perennials or subshrubs; heads in clusters of 5–50+ in (terminal or lateral) corymbiform arrays; involucres cylindric > 3
3 Leaf blades mostly 1.5–4 cm; involucres 5.5–7.5(–8) mm Chromolaena frustrata
3 Leaf blades mostly (3.5–)5–10 cm; involucres (7–)8–10 mm Chromolaena odorata

"fine" is not a number.

... more about "Chromolaena"
not tailed +, truncate +, rounded +  and obtuse +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
corymbiform +  and thyrsiform +
indeterminate +  and determinate +
Guy L. Nesom +
de Candolle in A. P. de Candolle and A. L. P. P. de Candolle +
decurrent +
not enlarged +
dissected +, lobed +, toothed +  and entire +
mostly deltate;ovate +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
linear;linear-clavate +
purple +  and blue lavender or reddish +
scabrellous +
prismatic +
fertile +  and bisexual +
se +, sc United States +, Mexico +, Central America +  and South America (especially Brazil) +
Greek chroma, color, and laina, cloak, evidently alluding to the colored phyllaries of some species, including the type +
puberulent +  and tomentose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
in usually determinate , rarely indeterminate , arrays +  and singly +
indeterminate +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
sessile +  and petiolate +
lanceolate +  and lance-linear +
lobed +  and dentate +
2-carpellate +
persistent +
18 +  and 65 +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
epaleate +  and paleate +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
clambering +  and erect +
appendaged +  and truncate +
hirsutulous +
papillate +
Compositae +
Chromolaena +
Asteraceae tribe Eupatorieae +
cylindric +
20 cm200 mm <br />0.2 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +