Home/Species/ Silky Horkelia

Horkelia sericata

S. Wats.

Silky Horkelia

G3Vulnerable (G3G4) Found in 4 roadless areas NatureServe Explorer →

G3VulnerableGlobal Rank

Identity

Unique IDELEMENT_GLOBAL.2.1202562

Element CodePDROS0W0N0

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicendemic to a single nation

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderRosales

FamilyRosaceae

GenusHorkelia

Concept Reference

Flora of North America Editorial Committee (FNA). 2014b. Flora of North America north of Mexico. Vol. 9. Magnoliophyta: Picramniaceae to Rosaceae. Oxford University Press, New York. xxiv + 713 pp.

Taxonomic Comments

Horkelia howellii following Flora of North America Editorial Committe (2014) "comprises the bulk of what D.D. Keck (1938) and subsequent floras included in H. sericata". According to Flora of North America Editorial Committe (2014), Horkelia howellii is the broader taxon, known from northwestern California and southwestern Oregon, while Horkelia sericata is "a localized taxon known only from Curry County, Oregon, and the Gasquet serpentine area in adjacent Del Norte County, California." In contrast, H. sericata as treated by Kartesz (1994, 1999) included both of these concepts. Flora of North America Editorial Committee (2014) states that "most collections can be unequivocally divided between plants with compact silvery-sericeous leaves with entire or forked stipules (H. sericata), and plants with larger, greener leaves and pinnately divided stipules (H. howellii)."

Conservation Status

Rank Method Rank calculation - Biotics v2

Review Date2021-05-04

Change Date2021-05-04

Edition Date2021-05-04

Edition AuthorsTomaino, A.

Range Extent1000-5000 square km (about 400-2000 square miles)

Number of Occurrences81 - 300

Rank Reasons

Horkelia sericata is known from Curry County, Oregon, and adjacent Del Norte County, California.

Range Extent Comments

Known only from Curry County, Oregon, and adjacent Del Norte County, California (Flora of North America Editorial Committee (2014).

Ecology & Habitat

Habitat

Habitat is chaparral, oak-conifer woodlands, on serpentine-derived soil (Flora of North America Editorial Committee (2014).

Terrestrial Habitats

Forest/WoodlandWoodland - MixedShrubland/chaparral

Other Nations (1)

United StatesN3

Province	Rank	Native
Oregon	S3	Yes
California	S3	Yes

Plant Characteristics

Economic Value (Genus)No

Roadless Areas (4)

California (3)

Area	Forest	Acres
Monkey Creek	Six Rivers National Forest	9,017
North Fork Smith	Six Rivers National Forest	37,898
Packsaddle	Six Rivers National Forest	3,862

Oregon (1)

Area	Forest	Acres
South Kalmiopsis	Siskiyou National Forests	104,477

References (2)

Flora of North America Editorial Committee (FNA). 2014b. Flora of North America north of Mexico. Vol. 9. Magnoliophyta: Picramniaceae to Rosaceae. Oxford University Press, New York. xxiv + 713 pp.
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.