Complete list of species
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| scientific name | common name(s) | image gallery |
| Justicia wrightii | Wright's Waterwillow | |
| Kalinia obtusiflora | Kalinia Grass | |
| Kallstroemia californica | California Caltrop Little Summer Poppy | |
| Kallstroemia grandiflora | Arizona Poppy Desert Poppy Orange Caltrop Summer Poppy | |
| Kallstroemia hirsutissima | Hairy Caltrop Hairy Carpetweed | |
| Kallstroemia maxima | Big Caltrop | |
| Kallstroemia parviflora | Warty Caltrop Small-flowered Carpetweed | |
| Kallstroemia perennans | Perennial Caltrop | |
| Kalmia angustifolia | Sheep Laurel Lambkill Kalmia Lambkill | |
| Kalmia carolina | Carolina Laurel | |
| Kalmia cuneata | Whitewicky White Wicky | |
| Kalmia hirsuta | Hairy Mountainlaurel Hairy Laurel | |
| Kalmia latifolia | Mountain Laurel Calico Bush Kalmia Mountain-laurel | |
| Kalmia microphylla | Alpine Laurel | |
| Kalmia polifolia | Bog Laurel Pale Laurel Swamp Laurel | |
| Kalmiopsis fragrans | North Umpqua Kalmiopsis Umpqua Kalmiopsis | |
| Kalmiopsis leachiana | North Umpqua Kalmiopsis Kalmiopsis | |
| Kanaloa kahoolawensis | Kanaloa | |
| Karwinskia humboldtiana | Coyotillo Humboldt Coyotillo | |
| Keckiella antirrhinoides | Snapdragon Penstemon Chaparral Bush-beardtongue Bush Penstemon | |
| Keckiella antirrhinoides ssp. antirrhinoides | Chaparral Beard Tongue Snapdragon Penstemon | |
| Keckiella antirrhinoides ssp. microphylla | Bush Penstemon Chaparral Beard Tongue Little Leaved Chaparral Beard Tongue Snapdragon Penstemon Yellow Bush Penstemon | |
| Keckiella breviflora | Bush Beardtongue Gaping Bush-beardtongue Gaping Penstemon | |
| Keckiella breviflora ssp. breviflora | Bush Beardtongue | |
| Keckiella breviflora ssp. glabrisepala | Bush Beardtongue Hairless Gaping Beardtongue Hairless Gaping Keckiella | |
| Keckiella cordifolia | Heartleaf Keckiella Heart-leaf Bush-beardtongue Climbing Penstemon Heartleaf Penstemon | |
| Keckiella corymbosa | Redwood Keckiella Red Shrubby Penstemon | |
| Keckiella lemmonii | Bush Beardtongue Lemmon Beardtongue Lemmon's Bush-beardtongue Lemmon's Keckiella Shrubby Penstemon | |
| Keckiella rothrockii | Rothrock's Bush-beardtongue Rothrock's Keckiella Rothrock's Penstemon | |
| Keckiella rothrockii ssp. jacintensis | Rothrock's Bush-beardtongue Rothrock's Keckiella Rothrock's Penstemon San Jacinto Mts. Keckiella | |
| Keckiella rothrockii ssp. rothrockii | Rothrock's Bush-beardtongue Rothrock's Keckiella Rothrock's Penstemon | |
| Keckiella ternata | Blue Stemmed Keckiella Blue-stem Bush-beardtongue Scarlet Keckiella | |
| Keckiella ternata ssp. septentrionalis | Northern Blue Stemmed Keckiella Northern Blue-stem Bush-beardtongue Scarlet Keckiella | |
| Keckiella ternata ssp. ternata | Blue Stemmed Keckiella Blue-stem Bush-beardtongue Scarlet Keckiella | |
| Kelloggia galioides | Milk Kelloggia Milky Kelloggia | |
| Kelseya uniflora | Oneflower Kelseya One-flower Kelseya One-flower Spiraea Alpine Laurel | |
| Keysseria erici | Alakai Swamp Island-Daisy | |
| Keysseria helenae | Mt. Waialeale Island-Daisy | |
| Keysseria maviensis | Howaiaulu Island-Daisy | |
| Koanophyllon solidaginifolium | Shrubby Thouroughwort Shrubby Umbrella Thouroughwort | |
| Koanophyllon villosum | Florida Keys Thoroughwort Florida Keys Umbrella Thoroughwort Florida Keys Umbrella Thoroughwort | |
| Kobresia myosuroides | Bellardi Bog Sedge | |
| Kobresia sibirica | Siberian Bog Sedge | |
| Kobresia simpliciuscula | Simple Bog Sedge | |
| Koeberlinia spinosa | Crown Of Thorns Spiny Allthorn | |
| Koeberlinia spinosa var. spinosa | Crown Of Thorns | |
| Koeberlinia spinosa var. tenuispina | Crown of Thorns Crucifixion Thorn Spiny Allthorn | |
| Koeleria asiatica | Eurasian Junegrass Oriental Koeler's Grass | |
| Koeleria asiatica ssp. atroviolacea | Eurasian Junegrass | |
| Koeleria macrantha | Prairie Junegrass Junegrass Prairie Koeler's Grass | |
| scientific name | common name(s) | image gallery |
