Studies on the Vascular Plants of Williamson County, Texas

Dr. Art Gibson, a retired professor from UCLA now living in Georgetown, has an ongoing project aimed at providing field-based descriptions of the native and naturalized plant species of Williamson County. The descriptions are being posted here in their original (pdf) format at the Plant Resources Center Williamson County website as they are finished:

Addtional Information:

Dr. Gibson’s introduction to his project

To see Dr. Gibson’s glossary of terms used in his descriptions [pdf] [web page].


This is a listing of all the PDFs available from this project. Click on a species to load the pdf and see more information. If you're looking for a particular species, you can type part of its name in the search box below to filter the results.

Click on a tile to load the pdf:

Abutilon fruticosum
Acacia farnesiana
Acaciella angustissima
Acalypha monococca
Acalypha ostryifolia
Acalypha phleoides
Acer negundo
Achillea millefolium
Acmella oppositifolia repens
Adiantum capillus veneris
Aegilops cylindrica
Aesculus pavia pavia
Agalinis edwandsiana
Agalinis heterophylla
Ailanthus altissima
Albizia julibrissin
Allium ampeloprasum
Allium canadense canadense
Allium canadense fraseri
Allium canadense mobilensis
Allium drummondii
Allowissadula holosericea
Alophia drummondii
Alternanthera caracasana
Alternanthera philoxeroides
Amaranthus albus
Amaranthus blitoides
Amaranthus polygonoides
Amaranthus retroflexus
Amaranthus scleropoides
Amaranthus tuberculatus
Amblyolepis setigera
Ambrosia artemisiifolia
Ambrosia psilostachya
Ambrosia trifida texana
Ammannia coccinea
Ammannia robusta
Amorpha fruticosa
Ampelopsis arborea
Ampelopsis cordata
Amphiachyris amoena
Anagallis arvensis
Andropogon gerardii gerardii.pdf
Andropogon glomeratus
Anemone berlandieri
Aphanostephus ramosissimus ramosissimus
Aphanostephus skirrhobasis skirrhobasis
Apocynum cannabinum
Aquilegia canadensis
Arbutus xalapensis
Arenaria benthamii
Arenaria serpyllifolia serpyllifolia
Argemone albiflora texana
Argythamnia humilis
Arisaema dracontium
Arnoglossum plantagineum
Arundo donax
Asclepias asperula capricornu
Asclepias curassavica.pdf
Asclepias oenotheroides
Asclepias verticillata
Asclepias viridis
Astragalus leptocarpus
Astragalus nuttallianus nuttallianus
Avena fatua
Avena sativa
Baccharis neglecta
Bacopa monnieri
Baptisia leucophaea
Bellardia trixaga
Berberis trifoliolata
Berchemia scandens
Berlandiera pumila
Bidens frondosa.pdf
Bidens laevis
Bifora americana
Boehmeria cylindrica
Boerhavia coccinea
Boerhavia erecta
Bothriochloa barbinodis
Bothriochloa ischaemum songarica
Bouchetia erecta
Bouteloua hirsuta
Bouteloua rigidiseta
Bouteloua rigidiseta.pdf
Bouteloua trifida trifida
Bowlesia incana
Brickellia cylindracea
Briza minor
Bromus catharticus catharticus
Bromus japonicus
Bromus pubescens
Bromus racemosus
Bromus secalinus.pdf
Bromus tectorum
Buchloe datyloides
Buglossoides arvensis
Caesalpinia gilliesii
Calibrachoa parviflora
Callicarpa americana
Callirhoe involucrata involucrata
Callirhoe involucrata lineariloba
Callirhoe leiocarpa
Callirhoe pedata
Calyptocarpus vialis
Camassia scilloides
Campsis radicans
Canna generalis
Capsella bursa pastoris
Cardiospermum halicacabum
Carduus pycnocephalus pycnocephalus
Carex bulbostylis
Carex festucacea
Carex muhlenbergii enervis
Carex planostachys
Carya illinoinensis
Castilleja indivisa
Castilleja purpurea lindheimeri
Catalpa speciosa
Ceanothus herbaceus
Celtis laevigata laevigata
Celtis laevigata reticulata
Cenchrus spinifex
Centaurea melitensis
Centrosema virginianum
Cephalanthus occidentalis
Cerastium brachypodum
Cerastium glomeratum
Ceratophyllum demersum
Cercis canadensis texensis
Chaerophyllum tainturieri
Chaetopappa asteroides asteroides
Chaetopappa bellidifolia
Chamaecrista fasciculata
Chamaecrista fasciculata fasciculata
Chamaesaracha coniodes
Chamaesaracha edwardsiana
Chasmanthium latifolium
Cheilanthes horridula
Chenopodium berlandieri boscianum.pdf
Chenopodium berlandieri zschackei
Chloris cucullata.pdf
Chloris verticillata
Chloris virgata
Chrysactinia mexicana
Chrysopsis pilosa
Cirsium horridulum horridulum
Cirsium texanum
Cirsium undulatum
Cirsium vulgare
Cissus incisa
Citrullus lanatus lanatus
Clematis drummondii
Clematis pitcheri pitcheri
Clematis texensis
Clinopodium brownei
Cnidoscolus texanus
Cocculus carolinus
Colocasia esculenta
Commelina erecta
Conoclinium coelestinum
Consolida ambigua
Convolvulus arvensis
Convolvulus equitans
Coreopsis lanceolata
Coreopsis tinctoria tinctoria
Cornus drummondii
Corydalis curvisiliqua curvisiliqua
Coryphantha sulcata
Crataegus viridis
Crepis pulchra
Croptilon divaricatum
Croton capitatus lindheimeri
Croton glandulosus lindheimeri
Croton monanthogynus
Croton texensis
Cucumis sativus
Cucurbita foetidissima
Cuscuta campestris
Cuscuta cuspidata
Cuscuta exaltata
Cuscuta indecora indecora
Cuscuta pentagona pubescens
Cyclospermum leptophyllum
Cylindropuntia leptocaulis
Cynanchum barbigerum barbigerum
Cynanchum racemosum unifarium
Cynodon dactylon
Cyperus difformis
Cyperus ochraceus.pdf
Cyperus odoratus
Cyperus reflexus
Cyperus retrorsus
Cyperus rotundus
Cyrtomium falcatum
Dactyloctenium aegyptium
Dalea aurea
Dalea candida
Dalea compacta compacta.pdf
Dalea drummondiana drummondiana
Dalea frutescens.pdf
Dalea multiflora
Dalea tenuis
Daucus carota
Daucus pusillus
Delphinium carolinianum vimineum
Dermatophyllum secundiflorum
Descurainia pinnata pinnata
Desmanthus acuminatus
Desmanthus illinoensis
Desmanthus leptolobus
Desmanthus velutinus
Desmazeria rigida
Desmodium paniculatum
Desmodium sessilifolium
Diaperia prolifera prolifera
Diaperia verna verna
Dichanthelium acuminatum
Dichanthelium oligosanthes scribnerianum
Dichanthelium pedicellatum
Dichondra carolinensis
Dichondra recurvata
Dicliptera brachiata
Digitaria ciliaris ciliaris
Digitaria pubiflora.pdf
Diodia teres
Diodia virginiana
Diospyros texana
Diplotaxis muralis
Draba cuneifolia cuneifolia
Draba platycarpa
Draba reptans reptans
Dyschoriste linearis
Dysodiopsis tagetoides
Dysphania ambrosioides
Echinocereus reichenbachii
Echinochloa colona
Echinochloa crusgalli.pdf
Echinochloa muricata microstachya.pdf
Echinodorus berteroi
Eclipta prostrata
Eleocharis geniculata
Eleocharis macrostachya
Eleocharis quadrangulata
Eleusine indica
Elymus canadensis
Elymus virginicus
Engelmannia peristenia
Equisetum hyemale affine
Eragrostis barrelieri
Eragrostis cilianensis
Eragrostis hypnoides.pdf
Eragrostis lugens
Eragrostis pilosa pilosa.pdf
Eragrostis reptans
Eragrostis superba
Eragrostis trichodes
Erigeron canadensis
Erigeron divaricatus
Erigeron modestus
Erigeron philadelphicus philadelphicus
Erigeron strigosus
Eriochloa contracta.pdf
Eriogonum longifolium longifolium
Eriogonum multiflorum multiflorum
Erioneuron pilosum pilosum
Erodium cicutarium
Erodium texanum
Eryngium hookeri
Eryngium leavenworthii
Erythranthe glabrata
Eupatorium serotinum
Euphorbia bicolor.pdf
Euphorbia corollata
Euphorbia cyathophora.pdf
Euphorbia davidii.pdf
Euphorbia dentata
Euphorbia fendleri
Euphorbia hypericifolia
Euphorbia maculata
Euphorbia marginata
Euphorbia missurica.pdf
Euphorbia nutans
Euphorbia prostrata
Euphorbia serpens
Euphorbia spathulata
Euphorbia tetrapora
Eustoma russellianum
Evolvulus sericeus
Eysenhardtia texana
Facelis retusa
Fatoua villosa
Festuca arundinacea
Festuca bromoides
Festuca myuros
Festuca octoflora glauca
Festuca perennis
Fleischmannia incarnata
Forestiera pubescens pubescens
Frangula caroliniana
Fraxinus albicans.pdf
Froelichia floridana
Froelichia gracilis
Fuirena simplex aristulata
Fuirena simplex simplex
Funastrum crispum
Gaillardia aestivalis aestivalis
Gaillardia pulchella
Gaillardia suavis
Galactia regularis
Galium aparine
Galium texense
Galium tinctorium
Galium virgatum
Gamochaeta pensylvanica
Geranium carolinianum
Geranium pusillum
Geum canadense
Gilia incisa
Gilia rigidula rigidula
Glandularia bipinnatifida
Glandularia pumila
Gleditsia triacanthos
Gonolobus suberosus granulatus
Grindelia adenodonta
Grindelia texana
Gutierrezia texana texana
Hedeoma acinoides
Hedeoma reverchonii reverchonii
Hedypnois cretica
Helenium amarum amarum
Helenium autumnale
Helenium elegans elegans
Helianthus annuus
Helianthus debilis cucumerifolius
Helianthus grosseserratus
Helianthus maximiliani
Heliotropium indicum
Heliotropium procumbens
Heliotropium tenellum
Heterotheca stenophylla
Heterotheca subaxillaris
Hexalectris spicata spicata
Hibiscus laevis
Hordeum murinum leporinum
Hordeum pusillum
Hordeum vulgare vulgare.pdf
Houstonia nigricans nigricans
Houstonia pusilla
Houstonia subviscosa
Hydrocotyle umbellata
Hydrocotyle verticillata triradiata
Hymenopappus artemisiifolius artemisiifolius
Hymenopappus scabiosaeus corymbosus
Hypericum drummondii
Hypochaeris glabra
Ibervillea lindheimeri
Ilex decidua
Ilex vomitoria
Indigofera miniata miniata
Ipomoea coccinea.pdf
Ipomoea cordatotriloba cordatotriloba
Ipomoea cordatotriloba torreyana
Ipomoea hederacea.pdf
Ipomoea nil
Ipomoea sinuata
Ipomopsis rubra
Iva annua
Iva asperifolia angustifolia
Juglans nigra
Juncus acuminatus
Juncus bufonius bufonius
Juncus dichotomus
Juncus interior
Juncus marginatus
Juncus texanus
Juniperus ashei
Juniperus virginiana virginiana
Justicia americana
Kallstroemia parviflora
Krameria lanceolata
Krigia cespitosa
Krigia wrightii
Kyllinga brevifolia.pdf
Lactuca ludoviciana
Lactuca serriola
Lagerstroemia indica
Lamium amplexicaule
Lantana camara
Lantana urticoides
Lathyrus hirsutus
Lechea tenuifolia
Leersia oryzoides.pdf
Lemna aequinoctialis
Lemna obscura
Lepidium austrinum
Lepidium didymum
Lepidium ruderale
Lepidium virginicum virginicum
Leptochloa dubia
Leptochloa fusca uninervia.pdf
Leptochloa panicea mucronata
Leptopus phyllanthoides
Lespedeza procumbens
Lespedeza texana
Lespedeza virginica
Leucospora multifida
Liatris punctata mucronata
Ligustrum lucidum
Ligustrum quihoui
Ligustrum sinense
Limnodea arkansana
Limnosciadium pinnatum
Limnosciadium pumilum
Lindera benzoin
Lindheimera texana
Linum berlandieri berlandieri
Linum hudsonioides
Linum rupestre
Linum usitatissimum
Lithospermum incisum
Lithospermum onosmodium
Lobelia cardinalis
Loeflingia squarrosa
Lonicera albiflora
Lonicera japonica
Ludwigia octovalvis octovalvis
Ludwigia peploides montevidensis
Ludwigia peploides peploides
Ludwigia repens
Lupinus texensis
Lygodesmia texana
Lythrum californicum
Maclura pomifera
Malvastrum coromandelianum
Malvaviscus arboreus drummondii
Marrubium vulgare
Marshallia caespitosa signata
Marsilea macropoda.pdf
Marsilea vestita
Matelea edwardsensis.pdf
Matelea reticulata
Maurandya antirrhiniflora
Mecardonia procumbens
Medicago arabica
Medicago lupulina
Medicago minima
Medicago polymorpha
Medicago sativa
Melampodium leucanthum
Melia azedarach
Melica nitens
Melilotus albus
Melilotus indicus
Melilotus officinalis
Melochia pyramidata
Melothria pendula
Menodora heterophylla
Mentzelia oligosperma
Mikania scandens
Mimosa borealis
Mimosa nuttallii
Mimosa roemeriana
Mimosa strigillosa
Mirabilis jalapa jalapa
Mitreola petiolata
Modiola caroliniana
Mollugo verticillata
Monarda citriodora citriodora
Monarda clinopodioides
Monarda punctata intermedia
Morus alba
Morus rubra
Muhlenbergia lindheimeri
Muhlenbergia lindheimeri.pdf
Muhlenbergia reverchonii
Muscari neglectum
Myagrum perfoliatum
Myosotis macrosperma
Myriophyllum heterophyllum
Najas guadalupensis guadalupensis
Nama hispidum
Nama jamaicense
Nandina domestica
Nasturtium officinale
Nekemias arborea
Nemastylis geminiflora
Nemophila phacelioides
Neptunia lutea
Neptunia pubescens microcarpa
Nicotiana glauca.pdf
Nicotiana repanda
Nolina lindheimeriana
Nothoscordum bivalve
Nuphar advena advena
Nuttallanthus texanus
Nymphaea mexicana
Oenothera capillifolia capillifolia
Oenothera curtiflora
Oenothera heterophylla heterophylla
Oenothera jamesii
Oenothera laciniata
Oenothera macrocarpa macrocarpa
Oenothera sinuosa
Oenothera speciosa
Oenothera suffrutescens
Oenothera suffulta
Oenothera triloba
Oenothera xenogaura.pdf
Opuntia engelmannii lindheimeri
Opuntia humifusa humifusa
Opuntia macrorhiza
Orobanche ramosa
Oxalis drummondii
Oxalis stricta
Packera tampicana
Palafoxia callosa
Palafoxia rosea macrolepis
Panicum amarum
Panicum capillare
Panicum coloratum
Panicum dichotomiflorum dichotomiflorum
Panicum hallii filipes
Panicum virgatum.pdf
Papaver rhoeas
Parietaria floridana
Parietaria pensylvanica
Parkinsonia aculeata
Paronychia drummondii
Parthenium hysterophorus
Parthenocissus heptophylla
Parthenocissus inserta
Parthenocissus quinquefolia
Paspalum dilatatum
Paspalum distichum
Paspalum floridanum
Paspalum langei.pdf
Paspalum notatum
Paspalum pubiflorum
Paspalum urvillei
Passiflora gossypiifolia
Passiflora incarnata
Passiflora lutea glabriflora
Pavonia lasiopetala
Pediomelum latestipulatum appressum
Pediomelum linearifolium
Penstemon cobaea
Persicaria bicornis
Persicaria hydropiperoides
Persicaria lapathifolia
Persicaria pensylvanica
Persicaria punctata
Persicaria setacea
Petunia parviflora
Phacelia congesta
Phalaris caroliniana
Phemeranthus calycinus
Phlox drummondii drummondii
Phlox pilosa riparia
Phlox roemeriana
Phoradendron leucarpum
Phoradendron serotinum serotinum
Photinia serratifolia
Phyla nodiflora
Phyllanthopsis phyllanthoides
Phyllanthus abnormis abnormis
Phyllanthus polygonoides
Phyllostachys aurea
Physalis acutifolia
Physalis angulata
Physalis cinerascens cinerascens
Physalis mollis mollis
Physaria densiflora
Physaria gordonii
Physaria recurvata
Physostegia correllii
Physostegia intermedia
Physostegia virginiana virginiana.pdf
Phytolacca americana
Pinaropappus roseum mcvaughii
Plantago aristata
Plantago helleri
Plantago hookeriana
Plantago lanceolata
Plantago rhodosperma
Plantago wrightiana
Platanus occidentalis occidentalis
Plectocephalus americanus
Pluchea odorata
Poa annua
Poa arachnifera
Polanisia dodecandra dodecandra
Polanisia dodecandra dodecandra.pdf
Polanisia dodecandra trachysperma.pdf
Polycarpon tetraphyllum tetraphyllum
Polygala alba
Polygala lindheimeri parviflora
Polygonella americana
Polygonum ramosissimum prolificum
Polypogon monspeliensis
Polypogon viridis
Polyprenum procumbens
Polytaenia nuttallii
Pontederia cordata
Populus deltoides deltoides
Portulaca oleracea
Portulaca pilosa
Potamogeton illinoensis
Potamogeton nodosus
Proboscidea louisiana louisiana
Prosopis glandulosa glandulosa
Prunus caroliniana
Prunus gracilis
Prunus mexicana
Prunus rivularis
Pseudognaphalium obtusifolium
Psoralidium tenuiflorum
Ptelea trifoliata mollis
Pyracantha fortuneana.pdf
Pyrrhopappus carolinianus
Pyrrhopappus pauciflorus
Pyrus calleryana
Quercus buckleyi
Quercus fusiformis
Quercus macrocarpa
Quercus marilandica
Quercus nigra
Quercus sinuata breviloba
Quercus stellata
Ranunculus macranthus
Ranunculus marginatus trachycarpus
Ranunculus sardous
Ranunculus sceleratus sceleratus
Rapistrum rugosum
Ratibida columnifera
Rhus aromatica
Rhus lanceolata
Rhynchosia minima
Rhynchosia senna texana
Rhynchosida physocalyx
Rhynchospora colorata
Rhynchospora nivea
Ricinus communis
Rivina humilis
Rubus trivialis
Rudbeckia amplexicaulis
Rudbeckia hirta
Ruellia caerulea
Ruellia humilis
Ruellia metziae.pdf
Ruellia nudiflora nudiflora
Rumex crispus
Rumex pulcher
Sabatia campestris
Sagittaria platyphylla
Salix nigra
Salvia coccinea
Salvia engelmannii
Salvia farinacea
Salvia greggii
Salvia reflexa
Salvia roemeriana
Salvia texana
Sambucus nigra canadensis
Samolus parviflorus
Sapindus saponaria drummondii
Schizachyrium scoparium.pdf
Schoenocaulon texanum
Schoenoplectus californicus
Scleria oligantha
Scutellaria drummondii
Scutellaria ovata bracteata
Scutellaria wrightii
Sedum nuttallii
Senecio ampullaceus
Senecio vulgaris
Senna lindheimeriana.pdf
Senna roemeriana
Sesbania drummondii
Sesbania herbacea
Setaria parviflora
Setaria pumila
Setaria reverchonii
Setaria scheelei
Setaria scheelei.pdf
Setaria viridis viridis
Sherardia arvensis
Sida abutifolia
Sida spinosa
Sideroxylon lanuginosum oblongifolium
Silene antirrhina
Silphium albiflorum
Silphium radula
Silybum marianum
Simsia calva
Sisymbrium irio
Sisymbrium officinale
Sisyrinchium minus
Smallanthus uvedalius
Smilax bona nox
Solanum dimidiatum
Solanum douglasii
Solanum elaeagnifolium
Solanum ptychanthum
Solanum rostratum
Solanum triquetrum
Solidago altissima altissima
Solidago nemoralis
Sonchus asper
Sonchus oleraceus
Sorghastrum nutans
Sorghum bicolor bicolor
Sorghum halepense
Spermolepis inermis
Sphenopholis obtusata
Stachys agraria
Stellaria media
Stellaria pallida
Stenotaphrum secundatum
Stillingia sylvatica
Stillingia texana
Streptanthus petiolaris
Strophostyles helvola
Stuckenia pectinata
Stylisma pickeringii pattersonii
Stylosanthes biflora
Styphnolobium affine
Symphoricarpus orbiculatus
Symphyotrichum divaricatum
Symphyotrichum drummondii texanum
Symphyotrichum ericoides ericoides
Symphyotrichum sericeum
Tamarix gallica
Taraxacum officinale
Tephrosia onobrychoides
Tephrosia virginiana
Tetraneuris linearifolia linearifolia
Tetraneuris scaposa scaposa
Teucrium canadense
Thalia geniculata.pdf
Thamnosma texana texana
Thelesperma filifolium
Thelesperma simplicifolium
Thelypteris ovata lindheimeri
Thymophylla pentachaeta
Thymophylla pentachaeta puberula
Tillandsia recurvata
Tinantia anomala
Torilis arvensis
Torilis nodosa
Toxicoscordion nuttallii
Tradescantia gigantea
Tradescantia humilis
Tradescantia occidentalis
Tradescantia subacaulis
Tragia brevispica
Tragia ramosa
Triadica sebifera
Tribulus terrestris
Tridens albescens
Tridens congestus
Tridens flavus chapmannii
Tridens muticus elongatus.pdf
Trifolium campestre
Trifolium incarnatum
Trifolium nigrescens
Trifolium pratense
Trifolium repens
Triodanis leptocarpa
Tripsacum dactyloides
Trisetum interruptum
Triticum aestivum
Typha domingensis
Ulmus americana
Ulmus crassifolia
Ulmus parvifolia
Ungnadia speciosa
Urochloa fusca
Urochloa reptans
Urochloa texana
Urtica chamaedryoides
Utricularia gibba
Vachellia farnesiana
Valerianella amarella
Valerianella radiata
Verbascum blattaria
Verbascum thapsus
Verbena brasiliensis
Verbena canescens
Verbena halei
Verbena neomexicana hirtella
Verbena neomexicana.pdf
Verbena rigida
Verbena scabra
Verbena xutha
Verbesina encelioides
Verbesina virginica
Vernonia baldwinii
Vernonia guadalupensis
Vernonia lindheimeri
Veronica agrestis
Veronica anagallis aquatica
Veronica arvensis
Veronica peregrina xalapensis
Veronica persica
Viburnum rufidulum
Vicia ludoviciana leavenworthii
Vicia sativa nigra
Vicia sativa sativa
Vicia villosa
Viguiera dentata
Vinca major
Viola missouriensis
Vitex agnus-castus
Vitis monticola
Vitis mustangensis
Warnockia scutellarioides
Wedelia acapulcensis hispida
Wolffia brasiliensis
Wolffia columbiana
Woodsia obtusa
Youngia japonica
Yucca arkansana
Yucca rupicola
Zannichellia palustris
Zanthoxylum hirsutum
Zeltnera beyrichii
Zeltnera muhlenbergii
Zeltnera texense
Zephyranthes chlorosolen
Zephyranthes drummondii