Plant Assessment Form

Hypochaeris radicata

Common Names: rough cat's-ear; false dandelion

Evaluated on: 7/30/03

List committee review date: 01/08/2003

Re-evaluation date:

Evaluator(s)

Peter J. Warner
California Dept. of Parks and Recreation; CalEPPC
P. O. Box 603, Little River, CA 95456-0603
(707) 937-9172; (707) 937-2278
pwarner@mcn.org; pwarn@parks.ca.gov

List commitee members

Jake Sigg
Peter Warner
Joe DiTomaso
Doug Johnson
Brianna Richardson

General Comments

No general comments for this species

Table 2. Criteria, Section, and Overall Scores

Overall Score? Moderate
Alert Status? No Alert
Documentation? 2 out of 5
Score Documentation
1.1 ?Impact on abiotic ecosystem processes U
Impact?
Four-part score UBCD Total Score
C
1.2 ?Impact on plant community B. Moderate Observational
1.3 ?Impact on higher trophic levels C. Minor Other Published Material
1.4 ?Impact on genetic integrity D. None Other Published Material
2.1 ?Role of anthropogenic and natural disturbance in establishment B. Moderate Other Published Material
Invasiveness?
Total Points
15 Total Score B
2.2 ?Local rate of spread with no management A. Increases rapidly Observational
2.3 ?Recent trend in total area infested within state C. Stable Observational
2.4 ?Innate reproductive potential
(see Worksheet A)
A. High Other Published Material
2.5 ?Potential for human-caused dispersal B. Moderate Observational
2.6 ? Potential for natural long-distance dispersal A. Frequent Observational
2.7 ?Other regions invaded C. Already invaded Other Published Material
3.1 ?Ecological amplitude/Range
(see Worksheet C)
A. Widespread Observational
Distribution?
Total Score A
3.2 ?Distribution/Peak frequency
(see Worksheet C)
A. High Observational

Table 3. Documentation

Scores are explained in the "Criteria for Categorizing Invasive Non-Native Plants that Threaten Wildlands".

Section 1: Impact
Question 1.1 Impact on abiotic ecosystem processes? U
Identify ecosystem processes impacted:

None known No basic research on ecology discovered


Sources of information:

Question 1.2 Impact on plant community composition,
structure, and interactions?
B Observational
Identify type of impact or alteration:

displacement of native species; alteration of community composition (especially coastal terrace prairie) based on personal observations


Sources of information:

Peter Warner, Jake Sigg, Joe DiTomaso


Question 1.3 Impact on higher trophic levels? C Other Published Material
Identify type of impact or alteration:

uncertain impacts on wildlife; reportedly the cause of Australian stringhalt in horses inference from impact on domestic mammalian herbivores that plant could harm native mammals


Sources of information:

Washington State Noxious Weed Control Board website


Question 1.4 Impact on genetic integrity? D Other Published Material

None known or documented No congeners native to California


Sources of information:

Hickman, et al. 1993. The Jepson Manual: Higher Vascular Plants of California


Section 2: Invasiveness
Question 2.1 Role of anthropogenic and natural disturbance
in establishment?
A Observational
Describe role of disturbance:

invades sites relatively undisturbed by human activity, but more invasive and prevalent on disturbed sites, such as grazed or burned lands, especially those in milder coastal areas some written information; personal observations; inference from extensive range in North America


Sources of information:

Washington State Noxious Weed Control Board; DiTomaso, J _______; U. S. Dept. of Agriculture website; Peter Warner (personal observation)


Question 2.2 Local rate of spread with no management? A Observational
Describe rate of spread:

will occupy available open soil; not as invasive in intact ecosystems; appears to respond to either soil disturbance or enhanced nitrogen levels written reports; personal observations


Sources of information:

Washington State Noxious Weed Control Board; DiTomaso, J; Peter Warner (personal observation) Jake Sigg


Question 2.3 Recent trend in total area infested within state? C Observational
Describe trend:

stable long-established in CA and elsewhere in North America _ inferred that range is unlikely to expand beyond previously invaded habitat


Sources of information:

Peter Warner (personal observation)


Question 2.4 Innate reproductive potential? A Other Published Material
Describe key reproductive characteristics:

iteroparous perennial _ Asteraceae; dispersal by seed (achene w/pappus) written material; floral characteristics


Sources of information:

DiTomaso, J _______; Hickman, et al. (1993)


Question 2.5 Potential for human-caused dispersal? B Observational
Identify dispersal mechanisms:

seed (attached to clothing) personal experience and observations


Sources of information:

Peter Warner


Question 2.6 Potential for natural long-distance dispersal? A Observational
Identify dispersal mechanisms:

seed attached to fur; wind-borneachenes w/pappus written information; personal observations


Sources of information:

DiTomaso, J ________.; P. Warner


Question 2.7 Other regions invaded? C Other Published Material
Identify other regions:

Pacific Northwest, northeastern, southeastern U. S.; British Isles based on distributional information from websites, published flora


Sources of information:

U. S. Dept. of Agriculture website; Washington State Noxious Weed Control Board


Section 3: Distribution
Question 3.1 Ecological amplitude/Range? A Observational

widespread in many ecological types, especially cismontane CA based on personal observations, flora of various areas


Sources of information:

Hickman, et al.; USDA website; Peter Warner (personal observations)


Question 3.2 Distribution/Peak frequency? A Observational
Describe distribution:

widespread and abundant in coastal terrace prairie and coastal bluff scrub, usually one of the more dominant species personal observations, unpublished data from wetlands delineations on Sonoma and Mendocino coasts, restoration projects at GGNRA


Sources of information:

Peter Warner (personal observation; unpublished data


Worksheet A - Innate reproductive potential

Reaches reproductive maturity in 2 years or less Yes
Dense infestations produce >1,000 viable seed per square meter Yes
Populations of this species produce seeds every year. Yes
Seed production sustained over 3 or more months within a population annually Yes
Seeds remain viable in soil for three or more years No
Viable seed produced with both self-pollination and cross-pollination Unknown
Has quickly spreading vegetative structures (rhizomes, roots, etc.) that may root at nodes No
Fragments easily and fragments can become established elsewhere No
Resprouts readily when cut, grazed, or burned Yes
Total points: 6
Total unknowns: 1
Total score: A?

Related traits:

Worksheet B - Arizona Ecological Types is not included here

Worksheet C - California Ecological Types

(sensu Holland 1986)
Major Ecological Types Minor Ecological Types Code?
Marine Systemsmarine systems
Freshwater and Estuarine lakes, ponds, reservoirs
Aquatic Systemsrivers, streams, canals
estuaries
DunescoastalB, 20% - 50%
desert
interior
Scrub and Chaparralcoastal bluff scrubA, > 50%
coastal scrubC, 5% - 20%
Sonoran desert scrub
Mojavean desert scrub (incl. Joshua tree woodland)
Great Basin scrub
chenopod scrub
montane dwarf scrub
Upper Sonoran subshrub scrub
chaparralA, > 50%
Grasslands, Vernal Pools, Meadows, and other Herb Communitiescoastal prairieB, 20% - 50%
valley and foothill grassland
Great Basin grasslandD, < 5%
vernal poolD, < 5%
meadow and seep
alkali playa
pebble plain
Bog and Marshbog and fen
marsh and swamp
Riparian and Bottomland habitatriparian forestC, 5% - 20%
riparian woodlandC, 5% - 20%
riparian scrub (incl.desert washes)C, 5% - 20%
Woodlandcismontane woodland
piñon and juniper woodland
Sonoran thorn woodlandU, Unknown
Forestbroadleaved upland forestC, 5% - 20%
North Coast coniferous forestC, 5% - 20%
closed cone coniferous forest
lower montane coniferous forest
upper montane coniferous forest
subalpine coniferous forest
Alpine Habitatsalpine boulder and rock field
alpine dwarf scrub
Amplitude (breadth): A
Distribution (highest score): A

Infested Jepson Regions

Click here for a map of Jepson regions

  • CA Floristic Province
  • Cascade Range
  • Central West
  • Great Valley
  • Modoc Plateau
  • Northwest
  • Sierra Nevada
  • Southwest