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Hemizonella minima

(Gray) Gray

Small-head Tarweed

G4Apparently Secure Found in 57 roadless areas NatureServe Explorer →
G4Apparently SecureGlobal Rank
Identity
Unique IDELEMENT_GLOBAL.2.155837
Element CodePDAST650C0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusHemizonella
Synonyms
Madia minima(Gray) Keck
Other Common Names
Hémizonelle à petits capitules (FR) oppositeleaved tarweed (EN)
Concept Reference
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.
Conservation Status
Review Date1991-08-05
Change Date1991-08-05
Ecology & Habitat

Description

Small-headed tarweed is an annual with stems up to 10 cm (4 in) high, and long, slender branches from near the base. The (usually) opposite leaves, 1-2 cm long, are linear and long-pointed. Foliage is sparsely hairy below and glandular above. Small clusters of flower heads occur on the ends of the short terminal branches. Each head has 3-5 glandular, involucral bracts, 2-4 mm high, enclosing a ray flower. The yellow rays are minute, and there is a solitary, yellow disk flower surrounded by small bracts. The curved seeds (achenes), enclosed in the glandular bracts, resemble a section of orange.

Diagnostic Characteristics

The low, long-branched habit with small heads is diagnostic.
Other Nations (2)
CanadaN4
ProvinceRankNative
British ColumbiaS4Yes
United StatesNNR
ProvinceRankNative
CaliforniaSNRYes
IdahoSNRYes
NevadaS2Yes
MontanaS3Yes
OregonSNRYes
WashingtonSNRYes
Plant Characteristics
Economic Value (Genus)No
Roadless Areas (57)
California (45)
AreaForestAcres
Adams PeakPlumas National Forest5,283
Bald RockPlumas National Forest4,675
Black ButteMendocino National Forest15,461
Bucks LakePlumas National Forest680
Callahan FlowModoc National Forest6,618
Caples CreekEldorado National Forest17,854
Carson - IcebergStanislaus National Forest56,430
ChinquapinShasta-Trinity National Forest22,040
DardanellesEldorado National Forest8,110
Dinkey LakesSierra National Forest34,171
DomeStanislaus National Forest11,085
EagleStanislaus National Forest16,116
East YubaTahoe National Forest17,968
Elk CreekMendocino National Forest23,182
Fawn LakeEldorado National Forest1,153
Granite ChiefTahoe National Forest6,546
Greenhorn CreekSequoia National Forest28,226
GrindstoneMendocino National Forest26,031
Grouse LakesTahoe National Forest19,085
KangarooKlamath National Forest40,617
Kings RiverSierra National Forest52,999
LavasModoc National Forest25,864
Middle ForkPlumas National Forest29,278
Mill PeakSan Bernardino National Forest7,884
MonarchSierra National Forest697
Mt. LassicSix Rivers National Forest6,643
Mt. OlsenInyo National Forest2,161
Mt. Shasta BShasta-Trinity National Forest2,809
North Fork American RiverTahoe National Forest38,495
North MountainStanislaus National Forest7,856
Orleans Mtn. CSix Rivers National Forest15,589
PyramidEldorado National Forest24,347
RinconSequoia National Forest54,610
RussianKlamath National Forest21,771
Salt SpringsEldorado National Forest133
ScodiesSequoia National Forest725
Slate Mtn.Sequoia National Forest12,299
SnoozerKlamath National Forest23,414
Snow MountainMendocino National Forest14,457
South ForkShasta-Trinity National Forest16,786
ThatcherMendocino National Forest16,652
Tom MartinKlamath National Forest9,031
Tragedy - Elephants BackEldorado National Forest20,866
Weaver BallyShasta-Trinity National Forest829
WoolstaffSequoia National Forest41,445
Montana (1)
AreaForestAcres
Roderick #684Kootenai National Forest29,677
Oregon (4)
AreaForestAcres
Lookout MountainOchoco National Forest14,115
Mclennon MountainWillamette National Forest8,085
Mt. JeffersonDeschutes National Forest2,282
Mt. BaileyUmpqua National Forest18,401
Washington (7)
AreaForestAcres
BackboneGifford Pinchot National Forest1,201
Big Lava BedGifford Pinchot National Forest19,043
ChelanWenatchee National Forest74,650
EntiatWenatchee National Forest72,617
QuartzWenatchee National Forest8,550
Stormy Mtn.Wenatchee National Forest32,612
Thorp Mtn.Wenatchee National Forest22,717
References (3)
  1. 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.
  2. 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.
  3. Munz, P.A., with D.D. Keck. 1959. A California flora. Univ. California Press, Berkeley. 1681 pp.