Home/Species/ Siskiyou Bells

Prosartes parvifolia

S. Wats.

Siskiyou Bells

G2Imperiled Found in 3 roadless areas NatureServe Explorer →

G2ImperiledGlobal Rank

UnknownThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.157649

Element CodePMLIL0R014

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicendemic to a single nation

KingdomPlantae

PhylumAnthophyta

ClassMonocotyledoneae

OrderLiliales

FamilyLiliaceae

GenusProsartes

Synonyms

Disporum hookeri var. parvifolium(S. Wats.) Britt.Disporum parvifolium(S. Wats.) Britt.Prosartes hookeri var. parvifolia(Torr.) Kartesz

Other Common Names

Siskiyou Fairy-bells (EN)

Concept Reference

Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

Taxonomic Comments

Mesler et al. (2010) find that Prosartes parvifolia is fertile, probably not of hybrid origin, and worthy of recognition as a distinct species. This treatment is followed by the Second Edition of The Jepson Manual (Baldwin et al. 2012). Treated in Kartesz (1999) as Prosartes hookeri var. parvifolia, it has also been called Disporum hookeri var. parvifolium. Recognized as Disporum parvifolium in Kartesz (1994), Peck (1961), and Abrams (1940), and as a probable hybrid (D. hookeri x D. smithii) in Munz and Keck (1959). FNA (vol. 26, 2002) did not recognize the variety, saying it intergrades with the typical.

Conservation Status

Rank Method Rank calculation - Biotics v2

Review Date2023-03-08

Change Date2023-03-08

Edition Date2023-09-11

Edition AuthorsMacBryde, Bruce, rev. Eberly (2023)

Threat ImpactUnknown

Range Extent250-1000 square km (about 100-400 square miles)

Number of Occurrences6 - 20

Rank Reasons

Prosartes parvifolia is a perennial herb of the Pacific Northwest of the United States with a restricted range in the Siskiyou Mountains of southwestern Oregon and northern California. There are less than 20 occurrences, most of which have less than 10-20 plants.

Range Extent Comments

Prosartes parvifolia occurs in the Pacific Northwest of the United States in a small area of the Siskiyou Mountains of northwestern California (Del Norte County) and southwestern Oregon at the border of Curry and Josephine Counties. Range extent was calculated using NatureServe Network Occurrence Data (NatureServe 2023).

Occurrences Comments

There are 18 element occurrences based on a 1 km separation distance.

Threat Impact Comments

The impact of threats to this species are largely unknown and more research is needed to understand the species habitat requirements, specifically the degree of favorable disturbance. It often occurs in areas of low disturbance, e.g. previously burned, logged, or maintained roadside. Roadsides disturbance and logging can be favorable or potentially detrimental depending on the methods employed. The creation of new roads may be a threat.

Ecology & Habitat

Habitat

This species grows in sunny, typically disturbed areas, within montane conifer and mixed-evergreen forest in undisturbed sites but also disturbed sites, like exposed roadsides or recently burned sites. It occurs elevations of 600-1525 m elevation (Mesler et al. 2010, CNPS 2012, CNDD 2023, Jepson Flora Project 2023).

Terrestrial Habitats

Forest/WoodlandForest - ConiferForest - Mixed

Other Nations (1)

United StatesN2

Province	Rank	Native
Oregon	S1	Yes
California	S2	Yes

Threat Assessments

Threat	Scope	Severity	Timing
4 - Transportation & service corridors	Large (31-70%)	Unknown	High (continuing)
4.1 - Roads & railroads	Large (31-70%)	Unknown	High (continuing)
5 - Biological resource use	Small (1-10%)	Unknown	High (continuing)
5.3 - Logging & wood harvesting	Small (1-10%)	Unknown	High (continuing)

Plant Characteristics

DurationPERENNIAL

Economic Value (Genus)No

Roadless Areas (3)

California (3)

Area	Forest	Acres
Siskiyou	Klamath National Forest	54,039
Siskiyou A	Six Rivers National Forest	1,017
Siskiyou B	Six Rivers National Forest	18,871

References (11)

Abrams, L. 1940. Illustrated flora of the Pacific states: Washington, Oregon, and California. Vol. 1. Ophioglossaceae to Aristolochiaceae. Stanford Univ. Press, Stanford, California. 538 pp.
Baldwin, B. G., D. H. Goldman, D. J. Keil, R. Patterson, T. J. Rosatti, and D. H. Wilken, eds. 2012. The Jepson manual: vascular plants of California. 2nd edition. University of California Press, Berkeley, CA. 1568 pp.
California Native Plant Society (CNPS). 2012. Rare Plant Status Review: <i>Prosartes parvifolia</i>. Online. Available: https://rareplants.cnps.org/Uploads/ReferenceDocs/ProsartesParvifolia_20120208_StsRevAdd.pdf.
California Natural Diversity Database (CNDDB). 2023. RareFind Version 5.2.14. California Department of Fish and Game, Sacramento.
Jepson Flora Project (eds.) 2023. Jepson eFlora. Online. Available: https://ucjeps.berkeley.edu/eflora/ (accessed 2023).
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
Mesler, M., R. Bencie and B. Hayashi. 2010. A resurrection for Siskiyou bells, <i>Prosartes parvifolia</i> (Liliaceae), a rare Siskiyou Mountains endemic. Madrono 57(2):129-135.
Munz, P.A., with D.D. Keck. 1959. A California flora. Univ. California Press, Berkeley. 1681 pp.
NatureServe. 2023. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
Peck, M.E. 1961. A manual of the higher plants of Oregon. 2nd edition. Binsford & Mort, Portland, Oregon. 936 pp.

Prosartes parvifolia

Habitat

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