Complete list of species
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| scientific name | common name(s) | image gallery |
| Ivesia shockleyi var. ostleri | Ostler's Mousetail Ostler’s Ivesia Wah Wah Ivesia | |
| Ivesia shockleyi var. shockleyi | Shockley’s Ivesia Sky Ivesia Sky Mousetail | |
| Ivesia tweedyi | Tweedy's Ivesia Tweedy's Mousetail | |
| Ivesia unguiculata | Yosemite Ivesia Yosemite Mousetail | |
| Ivesia utahensis | Utah Ivesia Utah Mousetail | |
| Ivesia webberi | Webber’s Ivesia Wire Ivesia Wire Mousetail | |
| Jacquemontia curtissii | Pineland Clustervine | |
| Jacquemontia havanensis | Havana Clustervine Havana Cluster Vine | |
| Jacquemontia ovalifolia | Oval-leaf Clustervine | |
| Jacquemontia ovalifolia ssp. sandwicensis | Oval-leaf Clustervine | |
| Jacquemontia pentanthos | Skyblue Clustervine | |
| Jacquemontia pringlei | Pringle's Clustervine | |
| Jacquemontia reclinata | Beach Clustervine Reclined Clustervine Beach Jacquemontia | |
| Jacquemontia tamnifolia | Hairy Clustervine Hairy Cluster-vine | |
| Jacquinia keyensis | Joewood | |
| Jaltomata procumbens | Creeping False Holly Tomatillo | |
| Jamesia americana | Fivepetal Cliffbush Cliffbush | |
| Jamesia americana var. americana | Fivepetal Cliffbush | |
| Jamesia americana var. macrocalyx | Fivepetal Cliffbush | |
| Jamesia americana var. rosea | Fivepetal Cliffbush Rosy Petalled Cliffbush | |
| Jamesia americana var. zionis | Zion Cliffbush | |
| Jamesia tetrapetala | Four-petal Cliffbush Fourpetal Cliffbush | |
| Jamesianthus alabamensis | Alabama Warbonnet | |
| Janusia gracilis | Slender Janusia | |
| Jatropha cardiophylla | Heartleaf Dragon's Blood Limberbush Sangre de Cristo | |
| Jatropha cathartica | Berlandier's Nettlespurge Jicamilla | |
| Jatropha cuneata | Leatherplant Limberbush Physicnut Sangre de Drago | |
| Jatropha dioica | Leatherstem Leather Stem Rubber Plant | |
| Jatropha dioica var. dioica | Leatherstem | |
| Jatropha dioica var. graminea | Leatherstem Bloodroot Sangre De Drago | |
| Jatropha macrorhiza | Jirawilla Ragged Nettle-spurge Ragged Nettlespurge | |
| Jatropha macrorhiza var. septemfida | Jirawilla Ragged Nettle-spurge Ragged Nettlespurge | |
| Jaumea carnosa | Fleshy Jaumea Marsh Jaumea | |
| Jefea brevifolia | Shortleaf Jefea | |
| Jeffersonia diphylla | Twinleaf | |
| Jensia rammii | Ramm's Madia | |
| Jensia yosemitana | Yosemite Tarplant Yosemite Tarweed | |
| Jepsonia heterandra | Foothill Button-saxifrage Foothill Jepsonia Foothills Jepsonia | |
| Jepsonia malvifolia | Island Button-saxifrage Island Jepsonia | |
| Jepsonia parryi | Coast Jepsonia Parry's Button-saxifrage Parry's Jepsonia | |
| Johanneshowellia crateriorum | Lunar Crater Buckwheat Howell's Buckwheat | |
| Johanneshowellia puberula | Red Creek Buckwheat Howell's Buckwheat | |
| Joinvillea ascendens | 'Ohe | |
| Juglans californica | Southern California Walnut California Black Walnut | |
| Juglans cinerea | Butternut White Walnut | |
| Juglans hindsii | Hinds's Black Walnut Northern California Black Walnut Northern California Walnut | |
| Juglans major | Arizona Walnut Arizona Black Walnut River Walnut Mountain Walnut Nogal Silvestre | |
| Juglans microcarpa | Little Walnut Texas Walnut Texas Black Walnut River Walnut Nogalito Nogalillo Namboca | |
| Juglans microcarpa var. microcarpa | Little Walnut Nogalito | |
| Juglans microcarpa var. stewartii | Nogalito Stewart's Little Walnut | |
| scientific name | common name(s) | image gallery |
