CNPS Inventory Plant Detail

Pentachaeta lyonii

Common Name:	Lyon's pentachaeta
Family:	Asteraceae
Synonyms:
Element Code:	PDAST6X060
Full Name:	Pentachaeta lyonii Gray
USDA PLANTS Symbol:	PELY4

Biology
Lifeform: annual herb Blooming Period: March - August Habitat: rocky, clay. • Chaparral (openings) • Coastal scrub • Valley and foothill grassland

Rarity Status
Rare Plant Rank: 1B.1 Rare, threatened, or endangered in California and elsewhere .1: Seriously endangered in California Federal Listing Status: FE Endangered (01/29/97) State Listing Status: CE Endangered (01/90) State Rank: S2 S2: Imperiled. Global Rank: G2 G2: Imperiled.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 41
Element Occurrence Ranks:

A B C D X U

3 15 11 3 6 3

Population Status:

Historic >20 yrs	Recent <=20 yrs
15	26

Presence:

Present Extant	Possibly Extirpated	Extirpated
35	5	1

Notes

Threatened by development, alteration of fire regimes, trampling, vehicles, and recreational activities. Seriously threatened by non-native plants; annual non-native grasses are an indirect factor contributing to extirpation. No successful translocation attempts as of 1994. See Synoptical Flora of North America 1(2):446 (1884) for original description, University of California Publications in Botany 65:1-41 (1973) for taxonomic treatment, and Madroño 58(2):69-77 (2011) for information on the impacts of non-native plants and management implications.
To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
Date Added: 1974-01-01
Last Update: 2012-07-10

Location

Elevation: 30 - 630 meters

California Endemic: yes

States: California

California Counties and Islands: name (code)
Los Angeles (LAX), Santa Catalina Island (SCT) ?*, Ventura (VEN)

Quads: name (DWR code) USGS code
San Pedro (073A)* 33118F3, Long Beach (089C)* 33118G2, Torrance (090D)* 33118G3, Malibu Beach (112C) 34118A6, Thousand Oaks (113A) 34118B7, Newbury Park (113B) 34118B8, Point Dume (113D) 34118A7, Simi (139D) 34118C7, Santa Catalina North (SCTN)?* 33118D4

Notes:

Definitions of codes preceding a county and/or quad:
*		Presumed extirpated
?		Uncertain about distribution or identity
?*		Uncertain about distribution, but presumed extirpated if once present
(?)		Occurrence confirmed, but possibly extirpated

Species may be present in other areas where conditions are favorable.

Presumed Extant

Presumed Extirpated or Unknown

1243

Links to Leading Resources of Taxon Information
USDA PLANTS Calflora CalPhotos Consortium of California Herbaria California Department of Fish and Wildlife: CNDDB Quick Viewer

Suggested Citation
California Native Plant Society (CNPS). Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society. Sacramento, CA. Accessed on .

-118.625,34.0