Plants of the Four Corners

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  Plantae

      Tracheophyta

            Magnoliopsida

                    Gentianales

                            Rubiaceae

                                     Arcytophyllum

                                             Arcytophyllum fasciculatum

                                                   [Hedyotis intricata]

                                                   [Houstonia fasciculata]

                                     Asperula

                                             Asperula tinctoria

                                                   [Galium triandrum]

                                     Bobea

                                             Bobea timonioides

                                     Bouvardia

                                             Bouvardia obovata

                                             Bouvardia tenuifolia

                                             Bouvardia ternifolia

                                                   [Bouvardia glaberrima]

                                                   [Bouvardia triphylla]

                                     Catesbaea

                                             Catesbaea melanocarpa

                                     Cephalanthus

                                             Cephalanthus occidentalis

                                                   [Cephalanthus occidentalis var. californicus]

                                                   [Cephalanthus occidentalis var. pubescens]

                                     Cinchona

                                             Cinchona micrantha

                                     Coelospermum

                                     Coprosma

                                             Coprosma cordicarpa

                                             Coprosma elliptica

                                             Coprosma kauensis

                                             Coprosma kawaikiniensis

                                     Crucianella

                                     Cruciata

                                             Cruciata glabra

                                               Cruciata glabra subsp. glabra

                                                     [Galium vernum]

                                     Crusea

                                             Crusea simplex

                                                   [Crusea diversifolia]

                                                   [Crusea subulata]

                                             Crusea wrightii

                                               Crusea wrightii var. wrightii

                                     Diodia

                                     Galium

                                           [Gallium]

                                           [Relbunium]

                                             Galium angustifolium

                                             Galium aparine

                                             Galium bifolium

                                             Galium boreale

                                                   [Galium boreale subsp. septentrionale]

                                                   [Galium boreale var. intermedium]

                                                   [Galium septentrionale]

                                             Galium buxifolium

                                             Galium californicum

                                               Galium californicum subsp. sierrae

                                             Galium collomiae

                                             Galium coloradoense

                                                   [Galium multiflorum var. coloradoense]

                                             Galium desereticum

                                             Galium emeryense

                                                   [Galium hypotrichium subsp. scabriusculum]

                                                   [Galium scabriusculum]

                                               Galium emeryense subsp. protoscabriusculum

                                                     [Galium scabriusculum subsp. protoscabriusculum]

                                             Galium fendleri

                                             Galium filipes

                                             Galium flavescens

                                                   [Galium ochroleucum]

                                             Galium flaviflorum

                                             Galium hypotrichium

                                               Galium hypotrichium subsp. hypotrichium

                                             Galium lanceolatum

                                             Galium magnifolium

                                             Galium matthewsii

                                             Galium mexicanum

                                               Galium mexicanum subsp. asperrimum

                                                     [Galium asperrimum]

                                                     [Galium mexicanum var. asperrimum]

                                               Galium mexicanum subsp. asperulum

                                                     [Galium mexicanum var. asperulum]

                                               Galium mexicanum subsp. mexicanum

                                             Galium microphyllum

                                                   [Relbunium laevigatum]

                                                   [Relbunium microphyllum]

                                             Galium multiflorum

                                                   [Galium bloomeri]

                                             Galium munzii

                                               Galium munzii subsp. ambivalens

                                               Galium munzii subsp. munzii

                                             Galium obtusum

                                             Galium odoratum

                                             Galium pilosum

                                             Galium proliferum

                                                   [Galium proliferum var. subnudum]

                                             Galium spurium

                                                   [Galium aparine subsp. spurium]

                                               Galium spurium subsp. spurium

                                                     [Galium agreste var. echinospermum]

                                                     [Galium aparine var. echinospermum]

                                                     [Galium aparine var. vaillantii]

                                                     [Galium biflorum]

                                                     [Galium vaillantii]

                                             Galium stellatum

                                                   [Galium acutissimum]

                                                   [Galium stellatum subsp. eremicum]

                                                   [Galium stellatum var. eremicum]

                                             Galium texense

                                             Galium tinctorium

                                                   [Galium tinctorium var. floridanum]

                                                   [Galium trifidum subsp. tinctorium]

                                             Galium trifidum

                                               Galium trifidum subsp. brevipes

                                                     [Galium brevipes]

                                               Galium trifidum subsp. columbianum

                                               Galium trifidum subsp. subbiflorum

                                                     [Galium tinctorium var. subbiflorum]

                                                     [Galium trifidum var. pusillum]

                                                     [Galium trifidum var. subbiflorum]

                                               Galium trifidum subsp. trifidum

                                                     [Galium brandegeei]

                                             Galium triflorum

                                             Galium uncinulatum

                                             Galium verum

                                             Galium virgatum

                                             Galium watsonii

                                                   [Galium hypotrichium subsp. utahense]

                                                   [Galium multiflorum var. watsonii]

                                             Galium wrightii

                                                   [Galium frankliniense]

                                                   [Galium rothrockii]

                                                   [Galium wrightii var. rothrockii]

                                     Gardenia

                                             Gardenia brighamii

                                             Gardenia jasminoides

                                             Gardenia mannii

                                     Hamelia

                                             Hamelia patens

                                     Hedyotis

                                             Hedyotis purpurascens

                                                   [Hedyotis purpurea]

                                     Hexasepalum

                                           [Diodella]

                                             Hexasepalum teres

                                                   [Diodella teres]

                                                   [Diodia teres var. angustata]

                                                   [Diodia teres var. setifera]

                                                   [Diodia teres]

                                     Hillia

                                             Hillia parasitica

                                     Houstonia

                                             Houstonia acerosa

                                                   [Hedyotis acerosa]

                                                   [Oldenlandia acerosa]

                                               Houstonia acerosa var. acerosa

                                               Houstonia acerosa var. polypremoides

                                                     [Hedyotis acerosa var. bigelovii]

                                                     [Hedyotis acerosa var. polypremoides]

                                                     [Houstonia acerosa subsp. polypremoides]

                                                     [Houstonia polypremoides]

                                             Houstonia humifusa

                                                   [Hedyotis humifusa]

                                             Houstonia prostrata

                                             Houstonia purpurea

                                               Houstonia purpurea var. montana

                                                     [Hedyotis purpurea var. montana]

                                               Houstonia purpurea var. purpurea

                                                     [Hedyotis nigricans var. rigidiuscula]

                                                     [Houstonia rigidiuscula]

                                             Houstonia pusilla

                                                   [Hedyotis crassifolia]

                                             Houstonia rosea

                                                   [Houstonia pygmaea]

                                             Houstonia rubra

                                                   [Hedyotis rubra]

                                             Houstonia wrightii

                                                   [Hedyotis pygmaea]

                                                   [Hedyotis wrightii]

                                     Kadua

                                             Kadua cookiana

                                                   [Hedyotis cookiana]

                                             Kadua cordata

                                               Kadua cordata subsp. remyi

                                                     [Hedyotis schlechtendahliana var. remyi]

                                             Kadua coriacea

                                             Kadua degeneri

                                             Kadua flynnii

                                             Kadua haupuensis

                                             Kadua laxiflora

                                                   [Hedyotis mannii]

                                             Kadua parvula

                                     Kelloggia

                                             Kelloggia galioides

                                     Leptopetalum

                                             Leptopetalum mexicanum

                                                   [Hedyotis cordata]

                                     Mitracarpus

                                             Mitracarpus breviflorus

                                             Mitracarpus hirtus

                                             Mitracarpus maxwelliae

                                             Mitracarpus polycladus

                                     Morinda

                                             Morinda citrifolia

                                     Mussaenda

                                             Mussaenda philippica

                                     Oldenlandia

                                     Phuopsis

                                             Phuopsis stylosa

                                                   [Crucianella stylosa]

                                     Psychotria

                                           [Macrocalyx]

                                             Psychotria grandiflora

                                             Psychotria hexandra

                                                   [Psychotria hexandra subsp. oahuensis]

                                             Psychotria hobdyi

                                     Randia

                                             Randia obcordata

                                     Rubia

                                             Rubia tinctorum

                                                   [Rubia tinctoria]

                                     Scleromitrion

                                             Scleromitrion angustifolium

                                                   [Hedyotis angustifolia]

                                     Sherardia

                                             Sherardia arvensis

                                     Stenaria

                                             Stenaria nigricans

                                                   [Hedyotis nigricans]

                                                   [Houstonia nigricans]

                                               Stenaria nigricans var. nigricans

                                                     [Hedyotis nigricans var. papillacea]

                                             Stenaria rupicola

                                                   [Houstonia rupicola]

                                     Stenotis

                                             Stenotis greenei

                                                   [Hedyotis greenei]

                                                   [Oldenlandia greenei]

                                     Vangueria

                                             Vangueria madagascariensis

                                               Vangueria madagascariensis var. madagascariensis

                                                     [Vangueria edulis]