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Hemizonia congesta

DC.

Hayfield Tarweed

G5Secure Found in 15 roadless areas NatureServe Explorer →
G5SecureGlobal Rank
Identity
Unique IDELEMENT_GLOBAL.2.1278811
Element CodePDAST4R0W0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusHemizonia
Other Common Names
hayfield tarweed (EN)
Concept Reference
Flora of North America Editorial Committee (FNA). 2006c. Flora of North America north of Mexico. Vol. 21. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford Univ. Press, New York. xxii + 616 pp.
Taxonomic Comments
This record is for the broad treatment of Hemizonia congesta as recognized by FNA (2006, vol. 21). This treatment and Baldwin et al. (2012) recognize six subspecies, with ssp. lutescens being recognized as distinct, ssp. vernalis being included in ssp. lutescens, and ssp. leucocephala being included in ssp. congesta. Considered to be comprised of seven subspecies by Kartesz (1999), Hickman (1993), Munz (1959), Ferris (1960). Kartesz (1994) treated H. clevelandii and H. lutescens as distinct species.
Conservation Status
Rank MethodExpertise without calculation
Review Date2000-12-21
Change Date2000-12-21
Edition Date2000-12-21
Edition AuthorsMacBryde, Bruce
Rank Reasons
Hemizonia congesta is in middle California (below 1400 meters) to southwestern Oregon, occurring in grasslands as well as fallow fields, and sometimes open woods and forests. Some of its subspecies can be common.
Ecology & Habitat

Habitat

Coastal grassland, generally at elevations below 300 m. Occasionally on serpentine (Hickman 1993).
Other Nations (1)
United StatesNNR
ProvinceRankNative
OregonSNRYes
CaliforniaSNRYes
Plant Characteristics
Economic Value (Genus)No
Roadless Areas (15)
California (15)
AreaForestAcres
Big Butte ShinboneMendocino National Forest4,265
Big Butte ShinboneSix Rivers National Forest1,102
CamuesaLos Padres National Forest8,209
De La GuerraLos Padres National Forest5,418
Elk CreekMendocino National Forest23,182
IshiLassen National Forest21,805
Malduce BuckhornLos Padres National Forest14,177
Reister CanyonMendocino National Forest5,897
Salt CreekSix Rivers National Forest9,505
Santa CruzLos Padres National Forest21,182
Skeleton GladeMendocino National Forest9,237
Snow MountainMendocino National Forest14,457
South ForkShasta-Trinity National Forest16,786
ThatcherMendocino National Forest16,652
Thomes CreekMendocino National Forest16,616
References (8)
  1. 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.
  2. Ferris, R.S. 1960. Illustrated flora of the Pacific states: Washington, Oregon, and California. Vol. IV. Bignoniaceae to Compositae. Stanford Univ. Press, Stanford, CA. 732 pp.
  3. Flora of North America Editorial Committee (FNA). 2006c. Flora of North America north of Mexico. Vol. 21. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford Univ. Press, New York. xxii + 616 pp.
  4. Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.
  5. 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.
  6. 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.
  7. Munz, P.A., with D.D. Keck. 1959. A California flora. Univ. California Press, Berkeley. 1681 pp.
  8. Peck, M.E. 1961. A manual of the higher plants of Oregon. 2nd edition. Binsford & Mort, Portland, Oregon. 936 pp.