Harris County

Showing 1–50 of 1,387.

• 
  Acalypha gracilens A. Gray Native ACGR2

  slender threeseed mercury · Euphorbiaceae
• 
  Acalypha monococca (Engelm. ex A. Gray) Lill. W. Mill. & Gandhi Native ACMO4

  slender threeseed mercury · Euphorbiaceae
• 
  Acalypha ostryifolia Riddell Native ACOS

  pineland threeseed mercury · Euphorbiaceae
• 
  Acalypha rhomboidea Raf. Native ACRH

  common threeseed mercury · Euphorbiaceae
• 
  Acer negundo L. Native ACNE2

  boxelder · Aceraceae
• 
  Acer rubrum L. Native ACRU

  red maple · Aceraceae
• 
  Acer saccharinum L. Native ACSA2

  silver maple · Aceraceae
• 
  Achillea millefolium L. Both ACMI2

  common yarrow · Asteraceae
• 
  Acmella oppositifolia (Lam.) R.K. Jansen Native ACOP

  oppositeleaf spotflower · Asteraceae
• 
  Acmella oppositifolia (Lam.) R.K. Jansen var. repens (Walter) R.K. Jansen Native ACOPR

  oppositeleaf spotflower · Asteraceae
• 
  Adiantum capillus-veneris L. Native ADCA

  common maidenhair · Pteridaceae
• 
  Aeschynomene indica L. Native AEIN

  Indian jointvetch · Fabaceae
• 
  Agalinis fasciculata (Elliott) Raf. Native AGFA2

  beach false foxglove · Scrophulariaceae
• 
  Agalinis heterophylla (Nutt.) Small ex Britton Native AGHE4

  prairie false foxglove · Scrophulariaceae
• 
  Agalinis oligophylla Pennell Native AGOL

  ridgestem false foxglove · Scrophulariaceae
• 
  Agdestis clematidea Moc. & Sessé ex DC. Introduced AGCL3

  rockroot · Phytolaccaceae
• 
  Ageratina altissima (L.) R.M. King & H. Rob. Native AGAL5

  white snakeroot · Asteraceae
• 
  Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. Native AGHY

  winter bentgrass · Poaceae
• 
  Agrostis perennans (Walter) Tuck. Native AGPE

  upland bentgrass · Poaceae
• 
  Ailanthus altissima (Mill.) Swingle Introduced AIAL

  tree of heaven · Simaroubaceae
• 
  Albizia julibrissin Durazz. Introduced ALJU

  silktree · Fabaceae
• 
  Allium canadense L. Native ALCA3

  meadow garlic · Liliaceae
• 
  Allium canadense L. var. canadense Native ALCAC

  meadow garlic · Liliaceae
• 
  Allium canadense L. var. mobilense (Regel) Ownbey Native ALCAM

  meadow garlic · Liliaceae
• 
  Allium drummondii Regel Native ALDR

  Drummond's onion · Liliaceae
• 
  Alophia drummondii (Graham) R.C. Foster Native ALDR2

  propeller flower · Iridaceae
• 
  Alternanthera philoxeroides (Mart.) Griseb. Introduced ALPH

  alligatorweed · Amaranthaceae
• 
  Amaranthus australis (A. Gray) Sauer Native AMAU

  southern amaranth · Amaranthaceae
• 
  Amaranthus blitum L. Introduced AMBL2

  purple amaranth · Amaranthaceae
• 
  Amaranthus hybridus L. Native AMHY

  slim amaranth · Amaranthaceae
• 
  Amaranthus palmeri S. Watson Native AMPA

  carelessweed · Amaranthaceae
• 
  Amaranthus powellii S. Watson Native AMPO2

  Powell's amaranth · Amaranthaceae
• 
  Amaranthus powellii S. Watson ssp. powellii Native AMPOP

  Powell's amaranth · Amaranthaceae
• 
  Amaranthus retroflexus L. Native AMRE

  redroot amaranth · Amaranthaceae
• 
  Amaranthus spinosus L. Native AMSP

  spiny amaranth · Amaranthaceae
• 
  Amaranthus tuberculatus (Moq.) Sauer Native AMTU

  roughfruit amaranth · Amaranthaceae
• 
  Ambrosia artemisiifolia L. Both AMAR2

  annual ragweed · Asteraceae
• 
  Ambrosia psilostachya DC. Native AMPS

  Cuman ragweed · Asteraceae
• 
  Ambrosia trifida L. Native AMTR

  great ragweed · Asteraceae
• 
  Ammannia coccinea Rottb. Native AMCO

  valley redstem · Lythraceae
• 
  Ammi majus L. Introduced AMMA

  large bullwort · Apiaceae
• 
  Ammoselinum butleri (Engelm. ex S. Watson) J.M. Coult. & Rose Native AMBU

  Butler's sandparsley · Apiaceae
• 
  Amorpha fruticosa L. Native AMFR

  false indigo bush · Fabaceae
• 
  Amphiachyris dracunculoides (DC.) Nutt. Native AMDR

  prairie broomweed · Asteraceae
• 
  Amsonia illustris Woodson Native AMIL

  Ozark bluestar · Apocynaceae
• 
  Amsonia repens Shinners Native AMRE3

  creeping bluestar · Apocynaceae
• 
  Anagallis arvensis L. Introduced ANAR

  scarlet pimpernel · Primulaceae
• 
  Anagallis arvensis L. ssp. arvensis Introduced ANARA7

  scarlet pimpernel · Primulaceae
• 
  Anagallis minima (L.) Krause Native ANMI4

  chaffweed · Primulaceae
• 
  Andropogon gerardii Vitman Native ANGE

  big bluestem · Poaceae