Threatened Plants
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- A Threatened species is one that is likely to become endangered throughout all or a significant portion of its range within the foreseeable future unless significant changes occur. Animals listed as Threatened may be stressed by over-exploitation or by habitat loss. Some of these species may still appear to be common but generally are experiencing such pressure throughout their range that it is important to offer them the additional protection this status provides. A general term used to cover all taxa whose survival is uncertain.
Index by Species
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- Abronia gracilis
- Abronia neurophylla
- Abutilon parishii
- Abutilon thurberi
- Acacia pennivenia
- Acacia polyacantha
- Acalypha dictyoneura
- Acanthosyris annonagustata
- Achnatherum wallowaensis
- Acleisanthes crassifolia
- Acleisanthes wrightii
- Aconitum noveboracense
- Adelia vaseyi
- Adenophorus haalilioanus
- Adenophorus hymenophylloides
- Adenophorus oahuensis
- Adiantum viridimontanum
- Aechmea napoensis
- Aegiphila ferruginea
- Aequatorium repandiforme
- Aeschynomene virginica
- Aetheolaena cuencana
- Aetheolaena lingulata
- Aetheolaena mojandensis
- Agalinis neoscotica
- Agave delamateri
- Agave murpheyi
- Agave neglecta
- Agave shawii
- Ageratina rhypodes
- Ageratum littorale
- Agoseris gaspensis
- Agrostis blasdalei
- Agrostis howellii
- Alchornea leptogyna
- Aletes humilis
- Aletris bracteata
- Aletris farinosa
- Allium constrictum
- Allium dictuon
- Allium elmendorfii
- Allium hickmanii
- Allium oxyphilum
- Allium scilloides
- Allium sharsmithiae
- Allium speculae
- Allium tribracteatum
- Allium tuolumnense
- Allium yosemitense
- Allolepis texana
- Aloe jawiyon
- Aloe perryi
- Alseis lugonis
- Amaranthus pumilus
- Amelanchier fernaldii
- Ammoselinum giganteum
- Amorpha paniculata
- Ampelocera longissima
- Amphianthus pusillus
- Amsinckia carinata
- Amsinckia lunaris
- Amsonia fugatei
- Amsonia grandiflora
- Anemia wrightii
- Angelica scabrida
- Angelica wheeleri
- Anthurium angustilaminatum
- Anthurium aristatum
- Anthurium campii
- Anthurium falcatum
- Anthurium furcatum
- Anthurium grex-avium
- Anthurium holm-nielsenii
- Anthurium lingua
- Anthurium maculosum
- Anthurium nigropunctatum
- Anthurium pallatangense
- Anthurium sparreorum
- Antidesma pulvinatum
- Anulocaulis reflexus
- Apacheria chiricahuensis
- Aphanisma blitoides
- Aphelandra sulphurea
- Apios priceana
- Aquilegia laramiensis
- Arabis beckwithii
- Arabis bodiensis
- Arabis constancei
- Arabis crandallii
- Arabis fecunda
- Arabis hastatula
- Arabis johnstonii
- Arabis macdonaldiana
- Arabis parishii
- Arabis pinzliae
- Arachniodes insularis
- Arceuthobium microcarpum
- Arctostaphylos andersonii
- Arctostaphylos auriculata
- Arctostaphylos bakeri
- Arctostaphylos bakeri sublaevis
- Arctostaphylos cruzensis
- Arctostaphylos edmundsii
- Arctostaphylos glutinosa
- Arctostaphylos insularis
- Arctostaphylos luciana
- Arctostaphylos montaraensis
- Arctostaphylos montereyensis
- Arctostaphylos morroensis
- Arctostaphylos myrtifolia
- Arctostaphylos nisseniana
- Arctostaphylos otayensis
- Arctostaphylos pajaroensis
- Arctostaphylos pechoensis
- Arctostaphylos peninsularis
- Arctostaphylos peninsularis peninsularis
- Arctostaphylos pilosula
- Arctostaphylos pumila
- Arctostaphylos purissima
- Arctostaphylos rainbowensis
- Arctostaphylos refugioensis
- Arctostaphylos regismontana
- Arctostaphylos rudis
- Arctostaphylos silvicola
- Arctostaphylos virgata
- Arctostaphylos wellsii
- Arenaria stenomeres
- Arenaria ursina
- Argemone glauca
- Argemone glauca var. glauca
- Argythamnia argyraea
- Ariocarpus kotschoubeyanus
- Aristeguietia cacalioides
- Aristocapsa insignis
- Arnoglossum diversifolium
- Arrojadoa dinae
- Artemisia kauaiensis
- Artemisia mauiensis
- Artemisia porteri
- Asclepias meadii
- Asclepias viridula
- Asplenium ascensionis
- Asplenium cardiophyllum
- Asplenium ecuadorense
- Asplenium hobdyi
- Asplenium kaulfussii
- Asplundia fagerlindii
- Astelia argyrocoma
- Asteropeia densiflora
- Astragalus ackermanii
- Astragalus aequalis
- Astragalus altus
- Astragalus ampullarius
- Astragalus anisus
- Astragalus anserinus
- Astragalus arrectus
- Astragalus beathii
- Astragalus beatleyae
- Astragalus chamaemeniscus
- Astragalus cimae
- Astragalus cimae var. cimae
- Astragalus consobrinus
- Astragalus cottonii
- Astragalus cronquistii
- Astragalus deanei
- Astragalus debequaeus
- Astragalus deterior
- Astragalus diversifolius
- Astragalus drabelliformis
- Astragalus eurylobus
- Astragalus funereus
- Astragalus gilmanii
- Astragalus gypsodes
- Astragalus harrisonii
- Astragalus johannis-howellii
- Astragalus kerrii
- Astragalus knightii
- Astragalus lackschewitzii
- Astragalus lentiformis
- Astragalus lentiginosus piscinensis var. piscinensis
- Astragalus leucolobus
- Astragalus limnocharis
- Astragalus limnocharis var. limnocharis
- Astragalus limnocharis var. montii
- Astragalus magdalenae peirsonii var. peirsonii
- Astragalus micromerius
- Astragalus mokiacensis
- Astragalus monoensis
- Astragalus mulfordiae
- Astragalus musiniensis
- Astragalus naturitensis
- Astragalus nevinii
- Astragalus oocarpus
- Astragalus phoenix
- Astragalus pinonis
- Astragalus piscator
- Astragalus pseudiodanthus
- Astragalus pycnostachyus
- Astragalus pycnostachyus var. pycnostachyus
- Astragalus rafaelensis
- Astragalus remotus
- Astragalus shevockii
- Astragalus straturensis
- Astragalus toquimanus
- Astragalus traskiae
- Astragalus troglodytus
- Astragalus tyghensis
- Astragalus uncialis
- Astragalus welshii
- Atriplex acadiensis
- Atriplex bonnevillensis
- Atriplex cordulata
- Atriplex coulteri
- Atriplex depressa
- Atriplex drymarioides
- Atriplex erecticaulis
- Atriplex franktonii
- Atriplex griffithsii
- Atriplex klebergorum
- Atriplex pachypoda
- Atriplex persistens
- Atriplex subtilis
- Aulonemia longiaristata
- Axinaea quitensis
- Azolla mexicana
Last Revised: September 30, 2008