Directory       News       Site Map       Home
         
    Jepson eFlora
Key to families | Table of families and genera

This text currently parallels The Jepson Manual: Vascular Plants of California, Second Edition that is now available at the University of California Press.

Text appearing in blue on this page will not appear in the printed book; it will be displayed only on the Web. Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

AGERATINA SNAKEROOT
Perennial, subshrub [ shrub].
Leaf: cauline, opposite or distal alternate, petioled; blade elliptic to triangular, entire or toothed, generally 3-veined from base.
Inflorescence: heads discoid, 1 or in ± flat-topped cyme-like clusters; involucre bell-shaped, phyllaries ± equal, in 1–2(3) series, linear to narrowly lanceolate; receptacle flat to conic, epaleate.
Flower: 10–60; corolla ± white to pink-tinged or lavender, cylindric (or throat wider); style branches linear.
Fruit: 5-angled, generally 5-ribbed; pappus of 5–40 slender scabrous bristles, often easily detached.
± 250 species: North America to South America. (Latin: resembling Ageratum) [King & Robinson 1987 Monogr Syst Bot Missouri Bot Gard 22:428–436; Nesom 2006 FNANM 21:547–553]
Unabridged references: [Nesom 2006 FNANM 21:547–553]

Key to Ageratina

1. Heads generally solitary (rarely 2–3) ..... A. shastensis

1' Heads clustered

2. Lvs alternate distally on stem; heads 8–10 mm ..... A. occidentalis

2' Lvs opposite throughout; heads 6–8 mm

3. Lf blade generally 40–100 mm; petiole generally 20–40 mm ..... A. adenophora

3' Lf blade generally 15–55 mm; petiole generally 5–10 mm ..... A. herbacea

Contact/Feedback

Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.