Difference between revisions of "Ageratina thyrsiflora"
Phytologia 19: 227. 1970.
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|name=Kyrstenia thyrsiflora | |name=Kyrstenia thyrsiflora | ||
|authority=Greene | |authority=Greene | ||
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|publication_title=Leafl. Bot. Observ. Crit. | |publication_title=Leafl. Bot. Observ. Crit. | ||
|publication_place=1: 9. 1903 | |publication_place=1: 9. 1903 | ||
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name=Ageratina thyrsiflora | name=Ageratina thyrsiflora | ||
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|authority=(Greene) R. M. King & H. Robinson | |authority=(Greene) 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/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V21_1405.xml |
|tribe=Asteraceae tribe Eupatorieae | |tribe=Asteraceae tribe Eupatorieae | ||
|genus=Ageratina | |genus=Ageratina | ||
Revision as of 19:34, 16 December 2019
Perennials or subshrubs, 50–100 cm. Stems erect (usually forming compact ‘bushlets’), finely and evenly puberulent (hairs minute, bent). Leaves usually alternate, sometimes subopposite (densely overlapping internodes); petioles 3–20 mm; blades ovate-lanceolate to triangular, 2.5–6.5 × 1–2.5(–3) cm, bases obtuse to cuneate, margins shallowly and coarsely crenate to serrate to subentire, apices rounded-obtuse, abaxial faces hirtellous. Heads clustered (in dense, terminal aggregates). Peduncles 3–8 mm, puberulent. Involucres 2.5–3 mm. Phyllaries: apices acute to obtuse (dark orange-veined), abaxial faces. Corollas white (orange-veined), glabrous. Cypselae hispid.
Phenology: Flowering Sep–Nov.
Habitat: Rocky sites, oak woodland
Elevation: 1000–2200 m
Distribution
Ariz., Mexico (Chihuahua, Durango, Jalisco, Sinaloa, Sonora).
Discussion
Ageratina thyrsiflora is known from the United States from a single collection dated 1929 from “near Nogales” in Santa Cruz County. It is recognized by its strict, unbranched or few-branched stems with alternate, densely arranged leaves, relatively small heads densely clustered in terminal aggregates, orange-veined phyllaries and corollas, and closely puberulent stems and petioles (hairs minute, sharply upwardly bent).
Selected References
None.