Home/Species/ Howell's Horkelia

Horkelia howellii

(Greene) Rydberg

Howell's Horkelia

G4Apparently Secure Found in 4 roadless areas NatureServe Explorer →

G4Apparently SecureGlobal Rank

LowThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.1202558

Element CodePDROS0W0M0

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicendemic to a single nation

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderRosales

FamilyRosaceae

GenusHorkelia

Other Common Names

Silky Honeydew (EN) silky horkelia (EN)

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 MethodLegacy Rank calculation - Excel v3.1x

Review Date2014-10-27

Change Date2016-05-20

Edition Date2014-10-27

Edition AuthorsBittman, R.

Threat ImpactLow

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

Number of Occurrences81 - 300

Ecology & Habitat

Other Nations (1)

United StatesNNR

Province	Rank	Native
California	S3	Yes
Oregon	SNR	Yes

Plant Characteristics

Economic Value (Genus)No

Roadless Areas (4)

California (2)

Area	Forest	Acres
North Fork Smith	Six Rivers National Forest	37,898
Packsaddle	Six Rivers National Forest	3,862

Oregon (2)

Area	Forest	Acres
North Kalmiopsis	Siskiyou National Forests	91,560
South Kalmiopsis	Siskiyou National Forests	104,477

References (3)

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.
Munz, P.A., with D.D. Keck. 1959. A California flora. Univ. California Press, Berkeley. 1681 pp.