Parthenium integrifolium

Linnaeus

Sp. Pl. 2: 988. 1753.

IllustratedEndemic
Synonyms: Parthenium auriculatum Britton Parthenium hispidum Rafinesque Parthenium hispidum var. auriculatum (Britton) Rollins Parthenium integrifolium var. auriculatum (Britton) Cornelius ex Cronquist Parthenium integrifolium var. henryanum Mears Parthenium integrifolium var. hispidum (Rafinesque) Mears Parthenium integrifolium var. mabryanum Mears Parthenium radfordii
Treatment appears in FNA Volume 21. Treatment on page 22. Mentioned on page 20.

Perennials, 30–60 (–100+) cm. Leaf-blades ovate to lanceolate, 30–350+ × 20–120+ mm, margins usually crenate to serrate, sometimes coarsely toothed or somewhat lobed (then mostly toward bases), faces hispid to hirtellous or ± scabrous, glanddotted. Heads radiate, borne in corymbiform to paniculiform arrays. Peduncles 1–8 (–12+) mm. Phyllaries: outer 5 (–6) lanceolate to broadly ovate, 3–5 mm, inner 5 (–6) ± orbiculate, 4–6 mm. Pistillate florets 5 (–6); corolla laminae ovate to oblong or orbiculate, 1–2+ mm. Disc-florets 15–35+. Cypselae ± obovoid, 3–4+ mm; pappuslike enations 0 or 2 (–4), erect to spreading, ± subulate or threadlike, fragile, 0.3–0.6+ mm. 2n = 72.


Phenology: Flowering May–Sep.
Habitat: Glades and barrens, prairies, disturbed sites
Elevation: 10–500 m

Distribution

V21-34-distribution-map.gif

Ala., Ark., Conn., Ga., Ill., Ind., Iowa., Kans., Ky., La., Mass., Mich., Minn., Miss., Mo., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va., Wis.

Discussion

As evidenced by the synonymy, Parthenium integrifolium as here circumscribed has been variously partitioned by other taxonomists. For the present, I see no justification for segregating species from, or for formal recognition of infraspecific taxa within P. integrifolium.

Selected References

None.

Lower Taxa

None.
... more about "Parthenium integrifolium"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
corymbiform +  and paniculiform +
indeterminate +  and determinate +
John L. Strother +
Linnaeus +
decurrent +
compound +  and simple +
lobed;spatulate;rounded-deltate;ovate;obovate;oblanceolate;lyrate;lanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
ochroleucous +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
villous +, strigillose +, hispidulous +, glabrous +  and warty +
scabrellous +  and tuberculate +
fertile +  and bisexual +
Ala. +, Ark. +, Conn. +, Ga. +, Ill. +, Ind. +, Iowa. +, Kans. +, Ky. +, La. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +, Va. +, W.Va. +  and Wis. +
10–500 m +
thread-like +, subulate +  and pappuslike +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
hispid +  and hirtellous or more or less scabrous +
winged +  and beaked +
dispersed +
Glades and barrens, prairies, disturbed sites +
in corymbiform , glomerate , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
less scarious +  and membranous +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
hemispheric +
conspicuous +
oblong +  and reniform or orbiculate or more or less coroniform +
3 cm30 mm <br />0.03 m <br /> (35 cm350 mm <br />0.35 m <br />) +
2 cm20 mm <br />0.02 m <br /> (12 cm120 mm <br />0.12 m <br />) +
sessile +  and petiolate +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
lobed +, toothed +, usually crenate +  and serrate +
lanceolate +  and broadly ovate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
herbaceous +  and scarious +
2-carpellate +
peripheral +
papillate +
fimbrillate;cuneate;flabelliform +
membranous +  and scarious +
persistent +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering May–Sep. +
unequal +  and subequal +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Illustrated +  and Endemic +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Parthenium auriculatum +, Parthenium hispidum +, Parthenium hispidum var. auriculatum +, Parthenium integrifolium var. auriculatum +, Parthenium integrifolium var. henryanum +, Parthenium integrifolium var. hispidum +, Parthenium integrifolium var. mabryanum +  and Parthenium radfordii +
Parthenium integrifolium +
Parthenium +
species +
campanulate +  and cylindric +
toothed +  and entire +
60 cm600 mm <br />0.6 m <br /> (100 cm1,000 mm <br />1 m <br />) +
30 cm300 mm <br />0.3 m <br /> (60 cm600 mm <br />0.6 m <br />) +
shrub +  and subshrub +