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

Previous taxon Indexes to all accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Previous taxon

DENNSTAEDTIACEAE BRACKEN FAMILY

John C. Game, Alan R. Smith & Thomas Lemieux

Plant terrestrial; rhizome hairy [scaly], from bud near stipe base or not. Leaf: alike, glabrous or hairy (scaly); stipe strongly grooved adaxially; blade generally 1–5-pinnate; veins pinnate from midrib, generally forked beyond, free except sometimes at margin of fertile segments. Sporangia: at or near margin, generally ± covered by false indusia; true indusium 0 or inner, linear [conical or cup-, purse- or saucer-like], opening toward margin [or fused with it to form cup]; stalk cells in 1–3 rows; spores spheric or elliptic.
± 11 genera, ± 170 species: especially tropics. [Smith et al. 2006 Taxon 55:705–731] Variously defined, now to exclude some previously included genera, species (Smith et al. 2006); Pteridium sometimes in its own family. —Scientific Editors: Alan R. Smith, Thomas J. Rosatti.
Unabridged references: [Smith et al. 2006. A classification for extant ferns. Taxon 55:705–731]

PTERIDIUM BRACKEN, BRAKE
Rhizome generally deep, long-creeping, branched; often forming dense stands; dead leaves persistent; scales 0. Leaf: stipe ± black near base, with dense, ± brown hairs, straw-colored above, ± glabrous; blade 2–4-pinnate, abaxially generally hairy; pinnae with nectaries in axils or not; veins free except at margin of fertile segments. Sporangia: generally continuous except at sinuses, on vein tips and veins connecting vein tips, ± covered by false indusium (sterile segment margins similarly modified); true indusium inconspicuous or 0; spores spheric.
± 5 species: temperate, tropics. (Greek: small fern) [Tryon 1941 Contr Gray Herb 134:1–31, 37–67] Often considered (e.g., by Tryon) to comprise 1 ± worldwide, highly variable sp., but especially in tropics, subtrops, species seem distinct. Plants belonging to this genus are among the most common, wide-ranging in the world, are often invasive, and regenerate quickly and vigorously after fires.

P. aquilinum (L.) Kuhn var. pubescens Underw.
NATIVE
Leaf: arched; stipe 10–100 cm; blade generally 15–150 cm, widely-triangular, leathery, generally 3-pinnate below, lower pinnae generally longest, ± 45° from axis; segments or lobes generally 0.5–2 cm, 3–6 mm wide, oblong, round at tip, hairs abaxially, sometimes adaxially, generally dense, straight or ± kinked, clear.
Pastures, woodland, meadows, hillsides, partial to full sun; < 3200 m. California Floristic Province (except Great Central Valley), Warner Mountains; to Alaska, South Dakota, northwestern Mexico; also eastern Canada, northeastern United States. TOXIC in quantity to livestock, humans; cooking removes some toxins, but carcinogens may remain. Other varieties in eastern United States, Mexico, Eurasia, Africa, Pacific. [Online Interchange]

Previous taxon: Pteridium
Next taxon: Dryopteridaceae

Contact/Feedback

Name search

Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 21 2014
Citation for this treatment: [Author of taxon treatment] 2013. Pteridium, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=64626, accessed on Oct 21 2014

Copyright © 2014 Regents of the University of California
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.


Geographic subdivisions indicated for the distribution of Pteridium aquilinum var. pubescens Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
READ ABOUT YELLOW FLAGS
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
View all CCH records

 

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.