California

• Alameda 06001
  1,856 taxa Open ↗
• Alpine 06003
  1,174 taxa Open ↗
• Amador 06005
  1,226 taxa Open ↗
• Butte 06007
  2,704 taxa Open ↗
• Calaveras 06009
  1,227 taxa Open ↗
• Colusa 06011
  1,330 taxa Open ↗
• Contra Costa 06013
  1,712 taxa Open ↗
• Del Norte 06015
  1,424 taxa Open ↗
• El Dorado 06017
  1,950 taxa Open ↗
• Fresno 06019
  2,373 taxa Open ↗

Showing 4,251–4,300 of 8,499 (native).

• 
  Horkelia tridentata Torr. ssp. tridentata Native HOTRT

  threetooth horkelia · Rosaceae 17 counties
• 
  Horkelia truncata Rydb. Native HOTR2

  Ramona horkelia · Rosaceae 2 counties
• 
  Horkelia tularensis (J.T. Howell) Munz Native HOTU

  Kern Plateau horkelia · Rosaceae 1 county
• 
  Horkelia wilderae Parish Native HOWI

  Barton Flats horkelia · Rosaceae 1 county
• 
  Horkelia yadonii Ertter Native HOYA2

  Santa Lucia horkelia · Rosaceae 3 counties
• 
  Horkeliella congdonis (Rydb.) Rydb. Native HOCO5

  Congdon's false horkelia · Rosaceae 3 counties
• 
  Horkeliella purpurascens (S. Watson) Rydb. Native HOPU8

  purple false horkelia · Rosaceae 2 counties
• 
  Hornungia procumbens (L.) Hayek Native HOPR4

  prostrate hutchinsia · Brassicaceae 21 counties
• 
  Horsfordia alata (S. Watson) A. Gray Native HOAL

  pink velvetmallow · Malvaceae 2 counties
• 
  Horsfordia newberryi (S. Watson) A. Gray Native HONE

  Newberry's velvetmallow · Malvaceae 3 counties
• 
  Howellanthus dalesianus (J.T. Howell) Walden & R.Patt. Native HODA2

  Scott Mountain phacelia · Hydrophyllaceae 3 counties
• 
  Howellia aquatilis A. Gray Native HOAQ

  water howellia · Campanulaceae 1 county
• 
  Howelliella ovata (Eastw.) Rothm. Native HOOV

  ovateleaf snapdragon · Scrophulariaceae 6 counties
• 
  Hulsea algida A. Gray Native HUAL

  Pacific hulsea · Asteraceae 9 counties
• 
  Hulsea brevifolia A. Gray Native HUBR

  shortleaf alpinegold · Asteraceae 5 counties
• 
  Hulsea californica Torr. & A. Gray Native HUCA

  San Diego alpinegold · Asteraceae 1 county
• 
  Hulsea heterochroma A. Gray Native HUHE

  redray alpinegold · Asteraceae 20 counties
• 
  Hulsea mexicana Rydb. Native HUME

  Mexican alpinegold · Asteraceae 1 county
• 
  Hulsea nana A. Gray Native HUNA

  dwarf alpinegold · Asteraceae 6 counties
• 
  Hulsea vestita A. Gray Native HUVE

  pumice alpinegold · Asteraceae 11 counties
• 
  Hulsea vestita A. Gray ssp. callicarpha (H.M. Hall) Wilken Native HUVEC

  pumice alpinegold · Asteraceae 2 counties
• 
  Hulsea vestita A. Gray ssp. gabrielensis Wilken Native HUVEG

  pumice alpinegold · Asteraceae 3 counties
• 
  Hulsea vestita A. Gray ssp. inyoensis (D.D. Keck) Wilken Native HUVEI

  pumice alpinegold · Asteraceae 2 counties
• 
  Hulsea vestita A. Gray ssp. parryi (A. Gray) Wilken Native HUVEP

  Parry's alpinegold · Asteraceae 5 counties
• 
  Hulsea vestita A. Gray ssp. pygmaea (A. Gray) Wilken Native HUVEP2

  pygmy alpinegold · Asteraceae 4 counties
• 
  Hulsea vestita A. Gray ssp. vestita Native HUVEV

  pumice alpinegold · Asteraceae 4 counties
• 
  Humulus lupulus L. var. neomexicanus A. Nelson & Cockerell Native HULUN

  common hop · Cannabaceae 1 county
• 
  Hydrocotyle ranunculoides L. f. Native HYRA

  floating marshpennywort · Apiaceae 20 counties
• 
  Hydrocotyle umbellata L. Native HYUM

  manyflower marshpennywort · Apiaceae 7 counties
• 
  Hydrocotyle verticillata Thunb. Native HYVE2

  whorled marshpennywort · Apiaceae 29 counties
• 
  Hydrocotyle verticillata Thunb. var. verticillata Native HYVEV

  whorled marshpennywort · Apiaceae 29 counties
• 
  Hydrophyllum capitatum Douglas ex Benth. Native HYCA4

  ballhead waterleaf · Hydrophyllaceae 12 counties
• 
  Hydrophyllum capitatum Douglas ex Benth. var. alpinum S. Watson Native HYCAA

  alpine waterleaf · Hydrophyllaceae 12 counties
• 
  Hydrophyllum capitatum Douglas ex Benth. var. capitatum Native HYCAC

  ballhead waterleaf · Hydrophyllaceae 1 county
• 
  Hydrophyllum capitatum Douglas ex Benth. var. thompsonii (M. Peck) Constance Native HYCAT

  Thompson's waterleaf · Hydrophyllaceae 1 county
• 
  Hydrophyllum fendleri (A. Gray) A. Heller Native HYFE

  Fendler's waterleaf · Hydrophyllaceae 4 counties
• 
  Hydrophyllum fendleri (A. Gray) A. Heller var. albifrons (A. Heller) J.F. Macbr. Native HYFEA

  white waterleaf · Hydrophyllaceae 3 counties
• 
  Hydrophyllum occidentale (S. Watson) A. Gray Native HYOC

  western waterleaf · Hydrophyllaceae 29 counties
• 
  Hydrophyllum tenuipes A. Heller Native HYTE

  Pacific waterleaf · Hydrophyllaceae 3 counties
• 
  Hymenoclea monogyra Torr. & A. Gray Native HYMO

  singlewhorl burrobrush · Asteraceae 2 counties
• 
  Hymenoclea salsola Torr. & A. Gray Native HYSA

  burrobrush · Asteraceae 11 counties
• 
  Hymenoclea salsola Torr. & A. Gray var. fasciculata (A. Nelson) K.M. Peterson & Payne Native HYSAF

  burrobrush · Asteraceae 8 counties
• 
  Hymenoclea salsola Torr. & A. Gray var. pentalepis (Rydb.) L.D. Benson Native HYSAP

  burrobrush · Asteraceae 2 counties
• 
  Hymenoclea salsola Torr. & A. Gray var. salsola Native HYSAS

  burrobrush · Asteraceae 9 counties
• 
  Hymenopappus filifolius Hook. Native HYFI

  fineleaf hymenopappus · Asteraceae 6 counties
• 
  Hymenopappus filifolius Hook. var. eriopodus (A. Nelson) B.L. Turner Native HYFIE

  fineleaf hymenopappus · Asteraceae 1 county
• 
  Hymenopappus filifolius Hook. var. filifolius Native HYFIF

  fineleaf hymenopappus · Asteraceae 1 county
• 
  Hymenopappus filifolius Hook. var. lugens (Greene) Jeps. Native HYFIL

  fineleaf hymenopappus · Asteraceae 3 counties
• 
  Hymenopappus filifolius Hook. var. megacephalus B.L. Turner Native HYFIM

  fineleaf hymenopappus · Asteraceae 1 county
• 
  Hymenopappus filifolius Hook. var. nanus (Rydb.) B.L. Turner Native HYFIN

  fineleaf hymenopappus · Asteraceae 2 counties