Ageratina altissima var. altissima

Common names: Common white snakeroot eupatoire rugueuse
IllustratedEndemic
Synonyms: Ageratina altissima var. angustata Fernald Eupatorium rugosum Reichard Eupatorium rugosum var. chlorolepis (B. L. Robinson) S. F. Blake Eupatorium rugosum var. tomentellum Eupatorium urticifolium
Treatment appears in FNA Volume 21. Treatment on page 549.

Phyllaries 3–5 mm, apices not cuspidate.


Phenology: Flowering Jul–Oct(–Nov).
Habitat: Moist forests, cove forests
Elevation: 10–800 m

Distribution

V21-1391-distribution-map.gif

N.B., N.S., Ont., Que., Sask., Ala., Ark., Conn., Del., Fla., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tenn., Tex., Vt., W.Va., Wis.

Discussion

Plants with narrow leaves, generally in the southwest part of the range of Ageratina altissima, have been recognized as var. angustata and were so mapped by A. F. Clewell and J. W. Wooten (1971), who indicated that all var. angustata occurs west of the Mississippi River and that this taxon was completely congruent in distribution with var. altissima. The present treatment confirms the westward tendency toward size reduction and observes that narrow-leaved plants occur widely through the southeast United States (including Arkansas, Kentucky, Louisiana, North Carolina, Oklahoma, Tennessee, and Texas). The transition is gradual and the region of intergradation is wide. In Texas, where the leaves mostly are narrow, plants with broad, cordate leaves are scattered through the range.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

villous +, sparsely +  and glabrous +
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 +
cordate +, usually rounded +  and truncate or obtuse +
enlarged +
Ageratum altissimum +
3(-5)-nerved +
11 cm110 mm <br />0.11 m <br /> (13 cm130 mm <br />0.13 m <br />) +
8 cm80 mm <br />0.08 m <br /> (9 cm90 mm <br />0.09 m <br />) +
4 cm40 mm <br />0.04 m <br /> (11 cm110 mm <br />0.11 m <br />) +
dissected +, lobed +, toothed +  and entire +
ovatelanceolate;usually deltate-ovate;ovate or broadly lanceolate +
2.5cm;8cm +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
Common white snakeroot +  and eupatoire rugueuse +
scabrellous +
fusiform +  and prismatic +
fertile +  and bisexual +
N.B. +, N.S. +, Ont. +, Que. +, Sask. +, Ala. +, Ark. +, Conn. +, Del. +, Fla. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, N.H. +, N.J. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Vt. +, W.Va. +  and Wis. +
10–800 m +
puberulent +, pilose +, hispidulous +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Moist forests, cove forests +
indeterminate +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
short-villous +
lanceolate +  and lance-linear +
2-carpellate +
persistent +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering Jul–Oct(–Nov). +
2-nerved +  and 0-nerved +
8 +  and 30 +
subequal +  and unequal +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Illustrated +  and Endemic +
semiscandent +, ascending +  and erect +
appendaged +  and truncate +
hirsutulous +
papillate +
Ageratina altissima var. angustata +, Eupatorium rugosum +, Eupatorium rugosum var. chlorolepis +, Eupatorium rugosum var. tomentellum +  and Eupatorium urticifolium +
Ageratina altissima var. altissima +
Ageratina altissima +
variety +
obconic +  and campanulate +
80 cm800 mm <br />0.8 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
50 cm500 mm <br />0.5 m <br /> (80 cm800 mm <br />0.8 m <br />) +
shrub +  and subshrub +