Difference between revisions of "Ageratina rothrockii"
Phytologia 19: 216. 1970.
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|common_names=Rothrock’s snakeroot | |common_names=Rothrock’s snakeroot | ||
− | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Eupatorium rothrockii | |name=Eupatorium rothrockii | ||
|authority=A. Gray | |authority=A. Gray | ||
+ | |publication_title=in A. Gray et al., Syn. Fl. N. Amer. | ||
+ | |publication_place=1(2): 102. 1884 | ||
}} | }} | ||
|synonyms= | |synonyms= | ||
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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/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V21_1393.xml |
|tribe=Asteraceae tribe Eupatorieae | |tribe=Asteraceae tribe Eupatorieae | ||
|genus=Ageratina | |genus=Ageratina |
Revision as of 19:47, 24 September 2019
Perennials, (20–)40–70(–150) cm (slender, fibrous-rooted crowns, with slender rhizomes). Stems ascending to erect, puberulent to glabrate. Leaves opposite; petioles 2–20 mm; blades (3–5-nerved) lanceolate to lanceolate-ovate, mostly 3–6 × (1.5–)2–3 cm, bases obtuse to truncate, margins serrate to crenate, apices acute to acuminate, sparsely puberulent abaxially, mostly along nerves. Heads clustered. Peduncles 5–12(–20) mm, puberulent. Involucres 5–7 mm. Phyllaries: apices acute, abaxial faces glabrous or glabrescent, eglandular. Corollas white, lobes short-villous. Cypselae sparsely and finely strigose-hirsute. 2n = 85 [ca. 100, fide A. M. Powell on label].
Phenology: Flowering (Jul–)Aug–Oct.
Habitat: Rocky slopes and ledges, in oak-juniper, pine-oak, pine, aspen, and spruce-fir woodland
Elevation: 1700–2400 m
Distribution
![V21-1393-distribution-map.gif](/w/images/0/0f/V21-1393-distribution-map.gif)
Ariz., N.Mex., Tex., Mexico (Chihuahua, Coahuila, Durango, Sonora).
Discussion
Ageratina rothrockii is similar to A. altissima, probably its western vicariant, and the two perhaps would be justifiably treated as conspecific.
Selected References
None.