CNPS Inventory Plant Detail

Helianthemum greenei

Common Name:	island rush-rose
Family:	Cistaceae
Synonyms:
Element Code:	PDCIS02090
Full Name:	Helianthemum greenei Rob.
USDA PLANTS Symbol:	HEGR2

Biology
Lifeform: perennial evergreen shrub Blooming Period: March - July Habitat: Rocky, openings.. • Closed-cone coniferous forest • Chaparral • Cismontane woodland • Coastal scrub

Rarity Status
CA Rare Plant Rank: 1B.2 Rare, threatened, or endangered in California and elsewhere .2: Fairly endangered in California Federal Listing Status: FT Threatened (07/31/97) State Listing Status: Not Listed State Rank: S2 S2: Imperiled. Global Rank: G2 G2: Imperiled.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 62
Element Occurrence Ranks:

A B C D X U

4 15 1 0 1 41

Population Status:

Historic >20 yrs	Recent <=20 yrs
21	41

Presence:

Present Extant	Possibly Extirpated	Extirpated
61	1	0

Notes

Six occurrences were discovered between 1999 and 2006 on SRO Isl., where it had not been collected since the 1930's. Presumed extirpated on SMI Isl., where it was last collected in 1939. Increasing on SCZ Isl. after reduction of feral herbivore population. Threatened by herbivory from non-native deer on SCT Isl. Also threatened by altered fire regimes and non-native plants. Hybridizes with H. scoparium.
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: 2012-03-05

Location

Elevation: 15 - 490 meters

California Endemic: yes

States: California

California Counties and Islands: name (code)
Santa Catalina Island (SCT), Santa Cruz Island (SCZ), San Miguel Island (SMI) *, Santa Rosa Island (SRO)

Quads: name (DWR code) USGS code
Santa Catalina East (SCTE) 33118C3, Santa Catalina North (SCTN) 33118D4, Santa Catalina South (SCTS) 33118C4, Santa Catalina West (SCTW) 33118D5, Santa Cruz Island A (SCZA) 33119H7, Santa Cruz Island B (SCZB) 33119H6, Santa Cruz Island C (SCZC) 33119H5, Santa Cruz Island D (SCZD) 33119H4, San Miguel Island East (SMIE) 33120H3, San Miguel Island West (SMIW)* 33120H4, Santa Rosa Island East (SROE) 33119H8, Santa Rosa Island North (SRON) 33120H1, Santa Rosa Island South (SROS) 33120G1

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

239

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

Suggested Citation
California Native Plant Society (CNPS). Inventory of Rare and Endangered Plants (online edition, v8-01a). California Native Plant Society. Sacramento, CA. Accessed on .

-118.25,33.29