Difference between revisions of "Ageratina altissima"

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

Phytologia 19: 212. 1970.

Common names: White snakeroot
Basionym: Ageratum altissimum Linnaeus Sp. Pl. 2: 839. 1753,
Treatment appears in FNA Volume 21. Treatment on page 549. Mentioned on page 548, 550, 551.
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|name=Ageratum altissimum
 
|name=Ageratum altissimum
 
|authority=Linnaeus
 
|authority=Linnaeus
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|rank=species
 
|publication_title=Sp. Pl.
 
|publication_title=Sp. Pl.
 
|publication_place=2: 839. 1753,
 
|publication_place=2: 839. 1753,
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-->{{#Taxon:
 
-->{{#Taxon:
 
name=Ageratina altissima
 
name=Ageratina altissima
|author=
 
 
|authority=(Linnaeus) R. M. King & H. Robinson
 
|authority=(Linnaeus) R. M. King & H. Robinson
 
|rank=species
 
|rank=species
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|publication year=1970
 
|publication year=1970
 
|special status=
 
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V21_1390.xml
+
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V21_1390.xml
 
|tribe=Asteraceae tribe Eupatorieae
 
|tribe=Asteraceae tribe Eupatorieae
 
|genus=Ageratina
 
|genus=Ageratina

Revision as of 19:34, 16 December 2019

Perennials, (30–)50–80(–120) cm (bases usually fibrous-rooted crowns, sometimes rhizomatous). Stems ascending to erect, sometimes semiscandent, puberulent (hairs minute, crisped). Leaves opposite; petioles (5–)10–30(–50) mm; blades usually deltate-ovate to ovate or broadly lanceolate, sometimes ovate-lanceolate, 4–11(–13) × 2.5–8(–9) cm, bases usually rounded to truncate or obtuse, sometimes cordate, margins coarsely and doubly incised-serrate, apices usually acuminate. Heads clustered. Peduncles 1–5 mm, puberulent. Involucres 4–5 mm. Phyllaries: apices acute, abaxial faces glabrous or sparsely and finely villous. Corollas white, lobes sparsely short-villous. Cypselae glabrous.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Phyllaries 3–5 mm, apices not cuspidate Ageratina altissima var. altissima
1 Phyllaries 4–7 mm, apices cuspidate to acuminate Ageratina altissima var. roanensis