Chromolaena ivifolia

(Linnaeus) R. M. King & H. Robinson

Phytologia 20: 202. 1970.

Common names: Ivy-leaf false thoroughwort
Illustrated
Basionym: Eupatorium ivifolium Linnaeus Syst. Nat. ed. 10, 2: 1205. 1759 (as ivaefoliu)
Synonyms: Osmia ivifolia (Linnaeus) Schultz-Bipontinus
Treatment appears in FNA Volume 21. Treatment on page 544.

Perennials or subshrubs, 50–150 cm. Stems erect, hispidulous to coarsely short-pilose. Petioles 0 or 0.5–1 (–3) mm. Leaf-blades linear-lanceolate to elliptic-lanceolate, 1.5–7 × 0.4–1.2 cm, margins denticulate to subentire. Heads usually 5–50+ in (terminal or lateral) corymbiform arrays. Involucres cylindric to campanulate, 5–6 mm. Phyllaries in (3–) 4–5 series, apices of the inner ± spreading (pinkish purple, hyaline, petaloid, slightly expanded, truncate). Corollas light blue to purplish or reddish. 2n = 50.


Phenology: Flowering Aug–Nov.
Habitat: Open woods, edges of fields and woods, roadsides, fencerows, ditches, other disturbed sites, flood plains, bottomlands, along streams
Elevation: 0–50 m

Distribution

V21-1382-distribution-map.gif

Fla., La., Miss., Tex., Mexico, West Indies, Central America, South America

Discussion

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Chromolaena ivifolia"
not tailed +, truncate +, rounded +  and obtuse +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
indeterminate +  and determinate +
Guy L. Nesom +
(Linnaeus) R. M. King & H. Robinson +
decurrent +
not enlarged +
Eupatorium ivifolium +
dissected +, lobed +, toothed +  and entire +
mostly deltate;ovate +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
linear;linear-clavate +
Ivy-leaf false thoroughwort +
light blue +  and purplish or reddish +
scabrellous +
prismatic +
fertile +  and bisexual +
Fla. +, La. +, Miss. +, Tex. +, Mexico +, West Indies +, Central America +  and South America +
0–50 m +
puberulent +  and tomentose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open woods, edges of fields and woods, roadsides, fencerows, ditches, other disturbed sites, flood plains, bottomlands, along streams +
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 />) +
cylindric;campanulate +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (7 cm70 mm <br />0.07 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
sessile +  and petiolate +
lanceolate +  and lance-linear +
denticulate +  and subentire +
2-carpellate +
persistent +
0.5-1(-3) mm +
Flowering Aug–Nov. +
18 +  and 65 +
epaleate +  and paleate +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
Illustrated +
appendaged +  and truncate +
hirsutulous +
papillate +
Osmia ivifolia +
Chromolaena ivifolia +
Chromolaena +
species +
cylindric +
50 cm500 mm <br />0.5 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +