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Wyoming Rare Plant Field Guide

Wyoming Rare Plant Reference List

Scientific Name
   Common Name
Heritage Rank Federal Status
Abronia ammophila Greene G1/S1 C2
Yellowstone Sand Verbena
Adenocaulon bicolor Hook. G5/S1 S-R2
American Trailplant
Agoseris lackschewitzii Henderson, Moseley & Cholewa G3/S2 S-R2,S-R4
Pink Agoseris
Agrostis rossiae Vasey G1/S1 C2
Ross' Bentgrass
Aletes humilis Coult. & Rose G2/SH C2,S-R2
Larimer Aletes
Amerorchis rotundifolia (Banks) Hulten G5/S1 S-R2
Round-leaved Orchid
Androsace chamaejasme Wulf. var. carinata (Torr.) Knuth G5T4/S2 FS-BT
Sweet-flowered Rock Jasmine
Androsace lehmanniana    
[see A. chamaejasme var. carinata]
Antennaria arcuata Cronq. G2/S2 C2,S-R4
Meadow Pussytoes
Aquilegia laramiensis A. Nels. G2/S2 C2,S-R2
Laramie Columbine
Arabis pusilla Roll. G1/S1 C1
Small Rock Cress
Arctostaphylos rubra (Rehd. & Wils.) Fern. G5/S1 S-R2
Red Manzanita
Arctous rubra    
[see Arctostaphylos r.]
Arnica lonchophylla Greene G4?/S1 S-R2
Northern Arnica
Artemisia biennis Willd. var. diffusa Dorn G5T1Q/S1 C2
Mystery Wormwood
Artemisia porteri Cronq. G2/S2  
Porter's Sagebrush
Asclepias uncialis Greene G3/SH C2,S-R2
Dwarf Milkweed
Aster mollis Rydb. G2G3/S2S3 C2,S-R2,S-R4
Soft Aster
Astragalus diversifolius Gray var. diversifolius G3/SH S-R4
Meadow Milkvetch
Astragalus drabelliformis Barneby G2/S2 C2
Bastard Draba Milkvetch
Astragalus gilviflorus Sheld. var. purpureus Dorn G5TS/S2 C2
Dubois Milkvetch
Astragalus jejunus Wats. var. articulatus Dorn G3T1/S1 C2
Hyattville Milkvetch
Astragalus jejunus Wats. var. jejunus G3T3/S2 S-R4
Starveling Milkvetch
Astragalus paysonii (Rydb.) Barneby G3/S2 C2,S-R4
Payson's Milkvetch
Astragalus proimanthus (Rydb.) Barneby G1/S1 C2
Precocious Milkvetch
Bolophyta alpina    
[see Parthenium alpinum]
Botrychium ascenders Wagner G3?/S1 C2,S-R2,S-R4
Upward-lobe Moonwort
Botrychium campestre Wagner & Farrar G2/S1 S-R2
Prairie Moonwort
Carex alopecoidea Tuckerm. G5/S1 S-R2
Foxtail Sedge
Carax incurviformis Mack. G3T3/S2 S-R4
Seaside Sedge
Carex livida (Wahl.) Willd. G5/S1 S-R2
Livid Sedge
Carex luzulina Olney var. atropurpurea Dorn G5T2/S2 S-R4
Black and Purple Sedge
Carex maritima    
[see C. incurviformis]
Cirsium aridum Dorn G1/S1 C2
Cedar Rim Thistle
Cirsium ownbeyi Welsh G3/S1 C2
Ownbey's Thistle
Cirsium sp. nov.    
[see C. aridum]
Cleome multicaulis Seese & Mocino G2/S1 C2
Many-Stemmed Spider-Flower
Cryptantha subcapitata Dorn & Lichvar G1/S1 C2
Owl Creek Miner's Candle
Cymopterus williamsii Hartman Contance G3/S3 3C
Williams' Waferparsnip
Cypripedium fasciculatum Kell. ex Wats. G3/S2 C2,S-R2,S-R4
Clustered Lady's Slipper
Cypripedium montanum Dougl. ex Lindl. G4G5/S1 C2
Mountain Lady's Slipper
Descurainia torulosa Roll. G1/S1 C2,S-R2,S-R4
Wyoming Tansymustard
Draba apiculata    
[see D. densifolia var. apiculata]
Draba borealis DC. G4/S1 FS-BT
Boreal Draba
Draba densifolia Nutt. var. apiculata G4G5/S2 S-R4
(Hitchc.) Welsh Rockcress Draba
Draba globosa    
[see D. densifolia var. apiculata]
Draba oligosperma var. pectinipila    
[see D. pectinipila]
Draba pectinipila Roll. G1Q/S1 C2
Comb-Hair Whitlow-Grass
Epipactis gigantea Dougl. ex Hook. G4/S1 S-R2
Giant Helleborine
Equisetum scirpoides Michx. G5/S1 S-R2
Dwarf Scouring Rush
Erigeron lanatus Hook. G4/S1 S-R2,S-R4
Wooly Fleabane
Eriogonum brevicaule Nutt. var. canum (Stokes) Dorn G3/S1 C2
Rabbit Buckwheat
Eriogonum lagopus    
[see E. brevicaule var. canum]
Festucu hallii (Vasey) Piper G2G3/S1 S-R2
Hall's Fescue
Gaura neomexicana Woot. ssp. coloradensis (Munz) Raven & Gregory G4T2/S2 C1,S-R2
Colorado Butterfly Plant
Haplopappus carthamoides var. subsquarrosus    
[see Pyrrocoma c. var. s.]
Haplopappus coloradoensis    
[see Machaeranthera c.]
Haplopuppus macronema Gray var. linearis (Rydb.) Dorn G4T2/S2 S-R4
Narrowleaf Goldenweed
Haplopappus macronema var. canescens    
[see H.m. var. linearis]
Ipomopsis aggregata (Pursh) V. Grant ssp. weberi V. Grant & Wilken G5T2?/S1 C2,S-R2
Weber's Scarlet-Gilia
Ipomopsis spicata (Nutt.) V. Grant ssp. robruthii Wilken & Hartman G4?T2/S2 C2,S-R2
Kirkpatrick's Ipomopsis
Lesquerella arenosa (Richards) Rydb. var. argillosa Roll. & Shaw G5T3/S1  
Sidesaddle Bladderpod
Lesquerella carinata Roll. var. carinata G3T3/S1 C2
Keeled Bladderpod
Lesquerella fremontii Roll. & Shaw G2/S2 S-R2
Fremont Bladderpod
Lesquerella macrocarpa A. Nels. G2/S2 C2
Large-Friuted Bladderpod
Lesquerella paysonii Roll. G2/S2 C2,S-R4
Payson's Bladderpod
Lycopodium complanatum L. G5/S1 S-R2
Trailing Clubmoss
Lycopodium dendroideum Michx. G5/S1 S-R2
Treelike Clubmoss
Machaeranthera coloradoensis (Gray) Osterh. G2?/S1 S-R2
Colorado Tansy-Aster
Muhlenbergia glomerata (Willd.) Trin. G4/S1 S-R2
Marsh Muhly
Orchis rotundifolia    
[see Amerorchis rotundifolia]
Oryzopsis contracta (Johnson) Shechter G3/S3 C2
Contracted Indian Ricegrass
Oryzopsis hymenoides var. contracta    
[see O. contracta]
Parrya nudicaulis (L.) Boiss. G5/S1 S-R2,S-R4
Naked-Stemmed Parrya
Parthenium alpinum (Nutt.) T. & G. G2G3/S2S3 S-R2
Alpine Feverfew
Penstemon acaulis Williams var. acaulis G3/S1 C2,S-R4
Stemless Beardtongue
Penstemon caryi Penn. G2/G3/S2 C2,S-R2
Cary's Beardtongue
Penstemon gibbensii Dorn G1/S1 C2
Gibben's Beardtongue
Phlox opalensis Dorn G1/S1 C2
Opal Phlox
Phlox pungens Dorn G2/S2 C2
Beaver Rim Phlox
Phlox sp. nov.    
[see P. opalensis]
Physaria condensata Roll. G2/S2  
Tufted Twinpod
Physaria dornii Lichvar G1/S1 C2
Dorn's Twinpod
Physaria eburniflora Roll. G2/S2 C2
Devil's Gate Twinpod
Physaria integrifolia (Roll.) Lichvar var. monticola Lichvar G3G4T2Q/S2 C2,S-R4
Creeping Twinpod
Physaria saximontana Roll. var. saximontana G3T2/S2 C2
Rocky Mountain Twinpod
Primula egaliksensis Wormskj. ex Hornem. G4/S1 S-R2,FS-BT
Greenland Primrose
Pyrrocoma carthamoides Hook. var. subsquarrosus (Greene) G. Brown & Keil G5T2/S2 C2,S-R2
Absaroka Goldenweed
Rorippa calycina (Engelm.) Rydb. G3/S3 C2
Persistent Sepal Yellowcress
Rubus acaulis    
[see R. arcticus ssp. a.]
Rubus arcticus L. ssp. acaulis (Michx.) Focke G5/S1 S-R2
Northern Blackberry
Salix myrtillifolia Anderss. var. myrtillifolia G5T5/S1 S-R2
Myrtleleaf Willow
Salix serissima (Bailey) Fern. G4/S1 S-R2
Autumn Willow
Saussurea weberi Hult. G3/S2 S-R4
Weber's Saw-Wort
Scirpus atrocinctus    
[see Scirpus c.]
Scirpus cyperinus (L.) Kunth. G5/S1 S-R2
Cottongrass Bulrush
Scirpus pumilus    
[see Scirpus r.]
Scirpus rollandii Fern. G5/S1 S-R2
Rolland's Bulrush
Shoshonea pulvinata Evert & Const. G2G3/S2 C2,S-R2
Sisyrinchium pallidum Cholewa & Henderson G3/S2S3 C2
Pale Blue-Eyed Grass
Sphaeromeria simplex (A. Nels.) Heller G1/S1 C2,S-R2
Laramie False Sagebrush
Spiranthes diluvialis Shev. G2/S1 T
Ute Lady's Tresses
Sullivantia hapemanii (Coulter & Fisher) Coulter var. hapemanii G2/S2 C2,S-R2
Hapeman's Sullivantia
Thelesperma caespitosum Dorn G1/S1 C2,S-R4
Green River Greenthread
Thelesperma pubescens Dorn G1/S1 C2,S-R4
Uinta Greenthread
Thelesperma subnudum var. caespitosum    
[see Thelesperma c.]
Townsendia condensata Parry ex Gray var. anomala (Heiser) Dorn G4T2/S2 S-R2
North Fork Easter Daisy
Townsendia microcephala Dorn G1/S1 C2
Cedar Mountain Easter Daisy
Townsendia sp. nov.    
[see T. microcephala]
Trifolium barnebyi (Isley) Dorn & Lichvar G1/S1 C2
Barneby's Clover
Trifolium haydenii var. barnebyi    
[see Trifolium b.]
Yermo xanthocephalus Dorn G1/S1 C2
Desert Yellowhead


C1 = USFWS Category 1
C2 = USFWS Category 2
T = Listed Threatened by USFWS
S-R2 = Designated Sensitive in USFS Region 2 (Rocky Mountain Region)
S-R4 = Designated Sensitive in USFS Region 4 (Intermountain Region)
FS-BT = Forest Sensitive, Bridger-Teton NF
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