penstemon genus --- plantain family
Alberta beardtongue (Penstemon albertinus) -- in June -- Glacier National Park blue & purple
white penstemon (Penstemon albidus) -- in June -- Pawnee National Grassland, CO white & cream
pink plains penstemon (Penstemon ambiguus) -- in July -- Bosque del Apache National Wildlife Refuge, NM red & pink
pink plains penstemon (Penstemon ambiguus) -- in June -- Wray, Yuma County, CO
broadbeard penstemon (Penstemon angustifolius) -- in June -- Pawnee National Grassland, CO blue & purple
sulphur penstemon (Penstemon attenuatus) -- in July -- Elko County, NV blue & purple
beardlip penstemon (Penstemon barbatus) -- in September -- Cimarron Canyon State Park, NM red & pink
shortstem beardtongue (Penstemon breviculus) -- in May -- Canyons of the Ancients National Monument, CO red & pink
Buckley's penstemon (Penstemon buckleyi) -- in May -- Picketwire Canyon, Comanche National Grassland, CO blue & purple
mat penstemon (Penstemon caespitosus) -- in June -- Ohio Pass Road, Gunnison County, CO blue & purple
blue penstemon (Penstemon cyaneus) -- in July -- Yellowstone National Park, WY blue & purple
sagebrush beardtongue (Penstemon cyathophorous) -- in June -- near Rand, Routt National Forest, CO red & pink
timberline beardtongue (Penstemon davidsonii var. praeteritus) -- in June -- Steens Mountain Wilderness Area, OR blue & purple
scabland penstemon (Penstemon deustus) -- in July -- Modoc National Forest, CA white & cream
scabland penstemon (Penstemon deustus) -- in June -- Steens Mountain Wilderness Area, OR
firecracker penstemon (Penstemon eatonii) -- in March -- Tonto National Forest, AZ red & pink
fuzzy-tongued penstemon (Penstemon eriantherus) -- in June -- Soapstone Prairie, Fort Collins Natural Area, CO blue & purple
fuzzy-tongued penstemon (Penstemon eriantherus) -- in June -- Sportsman Lake Road, WY
fuzzy-tongued penstemon (Penstemon eriantherus) -- in June -- The M Trail, Bozeman, southern Montana blue & purple
Fendler's penstemon (Penstemon fendleri) -- in April -- Presidio County, western Texas blue & purple
shrubby penstemon (Penstemon fruticosus var. fruticosus) -- in July -- Yellowstone National Park, WY red & pink
sawsepal penstemon (Penstemon glaber) -- in July -- Ramsay-Shockey, Larimer County Open Space, CO
sawsepal penstemon (Penstemon glaber) -- in June -- Pennock Pass, Roosevelt National Forest, CO blue & purple
sawsepal penstemon (Penstemon glaber) -- in July -- Forest Road 145, Poudre Canyon, Larimer County, CO
alpine sawsepal penstemon (Penstemon glaber var. alpinus) -- in July -- Boreas Pass Road, Park County, CO blue & purple
alpine sawsepal penstemon (Penstemon glaber var. alpinus) -- in August -- Pikes Peak Area, CO
lilac penstemon (Penstemon gracilis) -- in June -- Bobcat Ridge Natural Area, Fort Collins, CO red & pink
Hall's beardtongue (Penstemon hallii) -- in July -- Sportsman Lake Road, WY blue & purple
Hall's beardtongue (Penstemon hallii) -- in July -- Boreas Pass Road, Park County, CO
Hall's beardtongue (Penstemon hallii) -- in july -- Hoosier Pass, Park/Summit Counties, CO
Big Bend beardtongue (Penstemon havardii) -- in April -- Chihuahuan Desert Nature Center, TX red & pink
low beardtongue (Penstemon humilis) -- in May -- Yampa Bench Road, Dinosaur Nat'l Monument, CO blue & purple
larchleaf beardtongue (Penstemon laricifolius subsp. exilifolius) -- in July -- Cherokee Park Road, CO/WY border white & cream
Lyall's beardtongue (Penstemon lyallii) -- in June -- Glacier National Park, MT red & pink
Plumas County beardtongue (Penstemon neotericus) -- in July -- Lassen Volcanic National Park, CA blue & purple
mountain pride (Penstemon newberryi) -- in July -- Yosemite National Park, CA red & pink
mucronate penstemon (Penstemon pachyphyllus var. mucronatus) -- in May -- Dinosaur National Monument, UT blue & purple
Palmer's penstemon (Penstemon palmeri) -- in June -- Rocky Mountain Arsenal NWR, Denver Area, CO red & pink
Parry's beardtongue (Penstemon parryi) -- in March -- Tonto National Forest, AZ red & pink
Parry's beardtongue (Penstemon parryi) -- in March -- Organ Pipe Cactus National Monument, AZ
pincushion beardtonge (Penstemon procerus) -- in July -- Zimmerman Lake Trail, CO blue and purple
pincushion beardtongue (Penstemon procerus) -- in July -- Elko County, NV blue & purple
pincushion beardtongue (Penstemon procerus var. procerus) -- in July -- County Road 41, Larimer County, CO
pincushion beardtongue (Penstemon procerus var. procerus) -- in August -- Independence Pass, Lake & Pitkin counties, CO
Bridge penstemon (Penstemon rostriflorus) -- in July -- Yosemite National Park, CA red & pink
Rydberg's penstemon (Penstemon rydbergii) -- in July -- northwestern Colorado blue & purple
Rydberg's penstemon (Penstemon rydbergii) -- in June -- Steens Mountain Wilderness Area, OR blue & purple
Rydberg's penstemon (Penstemon rydbergii) -- in August -- Weston Pass Road, Lake County, CO
Rydberg's penstemon (Penstemon rydbergii) -- in June -- Red Feather Lakes, Roosevelt National Forest, CO blue & purple
sidebells penstemon (Penstemon secundiflorus) -- in April -- Well Gulch Nature Trail, Lory State Park, CO red & pink
illustration of "verticillaster" illustration of "secund"
sidebells penstemon (Penstemon secundiflorus) -- in May -- Bellvue, Larimer County, CO
sidebells penstemon (Penstemon secundiflorus) -- in April -- Homestead Trail, South Mesa Trailhead, Boulder County, CO
sidebells penstemon (Penstemon secundiflorus) -- in August -- South Valley Loop Trail, Lory State Park, CO
sidebells penstemon (Penstemon secundiflorus) -- in May -- Picketwire Canyon, Comanche National Grassland, CO
royal penstemon (Penstemon speciosus) -- in June -- Steens Mountain Wilderness Area, OR blue & purple
royal penstemon (Penstemon speciosus) -- in July -- Elko County, NV blue & purple
Rocky Mountain penstemon (Penstemon strictus) -- in July -- MuCullough Gulch, Summit County, CO blue & purple
Rocky Mountain penstemon (Penstemon strictus) -- in August -- Sprague Lake, Rocky Mountain National Park
Rocky Mountain penstemon (Penstemon strictus) -- in June -- Watson Lake State Wildlife Area, Larimer County, CO
Heller's beardtongue (Penstemon triflorus) -- in April -- Chihuahuan Desert Nature Center, TX red & pink
oneside penstemon (Penstemon unilateralis) -- in June -- Watson Lake State Wildlife Area, CO
oneside penstemon (Penstemon unilateralis) -- in July -- Hermit Park Open Space, Larimer County, CO
oneside penstemon (Penstemon unilateralis) -- in August -- Indian Meadows North, Poudre Canyon, Larimer County, CO
Front Range beardtongue (Penstemon virens) -- in May -- Mesa Trail, South Mesa Trailhead, Boulder County, CO blue & purple
Front Range beardtongue (Penstemon virens) -- in June -- Sand Creek, WY blue & purple
Front Range beardtongue (Penstemon virens) -- in May -- Waterfall Trail, Lory State Park, CO blue & purple
Front Range beardtongue (Penstemon virens) in May -- Arthur's Rock Trail, Lory State Park, CO blue & purple
Front Range beardtongue (Penstemon virens) -- in May -- Waterfall Trail, Lory State Park, CO blue & purple
Whipple's penstemon (Penstemon whippleanus) -- in July -- Old Fall River Road, Rocky Mountain NP, CO blue & purple
Whipple's penstemon (Penstemon whippleanus) -- in June -- Iindian Peaks Wilderness, CO
Whipple's penstemon (Penstemon whippleanus) -- in July -- Routt National Forest, CO white & cream
Wilcox's penstemon (Penstemon wilcoxii) -- in June -- Pattee Canyon, Lolo National Forest, northern Montana blue & purple