Taxon Summary

Leptosiphon grandiflorus, commonly known as large-flowered leptosiphon, is a annual herb in the Polemoniaceae that is found only in California. It occurs within Cismontane woodland, Closed-cone coniferous forest, Coastal bluff scrub, Coastal dunes, Coastal prairie, Coastal scrub, and Valley and foothill grassland, growing at elevations from 5 to 1220 meters. Leptosiphon grandiflorus is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Leptosiphon grandiflorus Benth.
Common Name:	large-flowered leptosiphon
Family:	Polemoniaceae
Element Code:	PDPLM090K0
USDA Plants Symbol:	LEGR23
Synonyms/Other Names:	Linanthus grandiflorus (Benth.) Greene

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Apr-Aug	Apr-Aug
Elevation:	5-1220 (15-4005)
General Habitats:	Cismontane woodland, Closed-cone coniferous forest, Coastal bluff scrub, Coastal dunes, Coastal prairie, Coastal scrub, Valley and foothill grassland
Microhabitat:	Sandy (usually)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G3G4
State Rank:	S3S4
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	0
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	0

Location


California Endemic: True
California Counties and Islands: Name (Code)
Alameda (ALA), Contra Costa (CCA), Humboldt (HUM), Kern (KRN), Lake (LAK), Marin (MRN), Mendocino (MEN), Merced (MER), Mono (MNO), Monterey (MNT), San Benito (SBT), San Diego (SDG), San Francisco (SFO), San Luis Obispo (SLO), San Mateo (SMT), Santa Barbara (SBA)*, Santa Clara (SCL), Santa Cruz (SCR), Sonoma (SON), Stanislaus (STA)
Quads: Name (Quad Code)
Arroyo Grande NE (3512025), Boucher Hill (3311638), Carmel Valley (3612146), Casmalia (3412075), Cerro Colorado (3612068), Chittenden (3612185), Chualar (3612155), Clayton (3712188), Cupertino (3712231), Delta Ranch (3712016), Drakes Bay (3812218), Gilroy (3712115), Gosford (3511931), Gustine (3712038), Hayward (3712261), Hoopa (4112316), Inverness (3812217), Isabel Valley (3712135), La Honda (3712233), Las Trampas Ridge (3712271), Laurel (3712118), Lick Observatory (3712136), Loma Prieta (3712117), Marina (3612167), Mariposa Peak (3612182), Mesa Grande (3311627), Mississippi Creek (3712124), Monterey (3612158), Morgan Hill (3712126), Mt. Day (3712146), Mt. Madonna (3712116), Mt. Sizer (3712125), Mustang Peak (3712123), Oakland East (3712272), Oakland West (3712273), Orcutt (3412074), Pacheco Pass (3712112), Palo Escrito Peak (3612144), Palomar Observatory (3311637), Rana Creek (3612145), Richmond (3712283), Rodriquez Mtn. (3311628), San Francisco North (3712274), San Francisco South (3712264), San Jose West (3712138), San Luis Obispo (3512036), San Luis Rey (3311723), San Pasqual (3311618), San Rafael (3712285), Santa Cruz (3612281), Santa Maria (3412084), Santa Teresa Hills (3712127), Seaside (3612157), Soberanes Point (3612148), Soquel (3612188), Spreckels (3612156), Tomales (3812228), Valley Ford (3812238), Walnut Creek (3712281), Watsonville East (3612186), Whispering Pines (3812276), Willits (3912343)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



Many historical occurrences extirpated by development; need status information. A synonym of Linanthus grandiflorus in The Jepson Manual. See Pittonia 2:260 (1892) for revised nomenclature, and Aliso 19(1):55-91 (2000) for taxonomic treatment.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 29 January 2025].

Taxon Report

Leptosiphon grandiflorus Benth.

large-flowered leptosiphon