Complete list of species
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| scientific name | common name(s) | image gallery |
| Hesperolinon adenophyllum | Glandular Dwarf Flax Glandular Dwarf-flax Glandular Western Flax | |
| Hesperolinon bicarpellatum | Two Carpellate Western Flax Two-carpeled Dwarf-flax Two-carpellate Western Flax Twocarpel Dwarf Flax Twocarpel Dwarf-flax | |
| Hesperolinon breweri | Brewer's Dwarf Flax Brewer's Dwarf-flax Brewer's Western Flax | |
| Hesperolinon californicum | California Dwarf Flax California Dwarf-flax California Western Flax | |
| Hesperolinon clevelandii | Allen Springs Dwarf Flax Allen Springs Dwarf-flax Allen Springs Western Flax | |
| Hesperolinon congestum | Marin Dwarf Flax Marin Dwarf-flax Marin Western Flax | |
| Hesperolinon didymocarpum | Lake County Dwarf Flax Lake County Dwarf-flax Lake County Western Flax | |
| Hesperolinon disjunctum | Coast Range Dwarf Flax Coast Range Dwarf-flax Coast Range Western Flax | |
| Hesperolinon drymarioides | Drymaria Dwarf-flax Drymaria-like Western Flax Drymary Dwarf Flax Drymary Dwarf-flax | |
| Hesperolinon micranthum | Common Dwarf Flax Small Flower Western Flax Small Flowered Dwarf Flax Smallflower Dwarf-flax Threadstem Flax | |
| Hesperolinon sharsmithiae | Sharsmith's Western Flax Sharsmith's Dwarf Flax | |
| Hesperolinon spergulinum | Slender Dwarf Flax Slender Dwarf-flax Slender Western Flax | |
| Hesperolinon tehamense | Paskenta Grade Dwarf Flax Paskenta Grade Dwarf-flax Tehama County Western Flax Tehama Dwarf-flax | |
| Hesperomannia arborescens | Lanai Island-Aster | |
| Hesperomannia arbuscula | Maui Island-Aster | |
| Hesperomannia lydgatei | Kauai Island-Aster | |
| Hesperostipa comata | Needle And Thread Needle-and-thread | |
| Hesperostipa comata ssp. comata | Needle And Thread | |
| Hesperostipa comata ssp. intermedia | Intermediate Needle And Thread | |
| Hesperostipa curtiseta | Shortbristle Needle And Thread Western Porcupine Grass | |
| Hesperostipa neomexicana | New Mexico Feathergrass | |
| Hesperostipa spartea | Porcupinegrass Porcupine Grass | |
| Hesperoyucca newberryi | Chaparral Yucca Grand Canyon Quixote Plant Newberry's Yucca Our Lord's Candle | |
| Hesperoyucca whipplei | Our Lord's Candle Chaparral Yucca Foothill Yucca Quixote Yucca | |
| Heteranthera dubia | Grassleaf Mudplantain Water Stargrass | |
| Heteranthera limosa | Blue Mudplantain Blue Mud Plantain | |
| Heteranthera mexicana | Mexican Mudplantain Mexican Mud-plantain | |
| Heteranthera multiflora | Bouquet Mudplantain Bouquet Mud-plantain Multiflowered Mud-plantain | |
| Heteranthera peduncularis | Egret Mudplantain Egret Mud-plantain | |
| Heteranthera reniformis | Kidneyleaf Mudplantain Kidney-leaf Mud-plantain | |
| Heteranthera rotundifolia | Roundleaf Mudplantain Round-leaf Mud-plantain | |
| Heterocodon rariflorum | Rareflower Heterocodon Few Flowered Heterocodon Western Pearlflower | |
| Heterodraba unilateralis | Ladies'-tongue Mustard Ladiestongue Mustard | |
| Heteromeles arbutifolia | Toyon California Christmasberry Christmasberry California Holly Hollywood | |
| Heteromeles arbutifolia var. arbutifolia | Christmas Berry Toyon | |
| Heteromeles arbutifolia var. cerina | Christmas Berry Toyon | |
| Heteromeles arbutifolia var. macrocarpa | Christmas Berry Toyon | |
| Heteropogon contortus | Tanglehead | |
| Heteropogon melanocarpus | Sweet Tanglehead | |
| Heterosperma pinnatum | Wingpetal | |
| Heterotheca barbata | Spokane False Goldenaster Spokane Goldenaster | |
| Heterotheca camporum | Lemonyellow False Goldenaster Golden Aster | |
| Heterotheca camporum var. camporum | Lemonyellow False Goldenaster Golden Aster | |
| Heterotheca camporum var. glandulissimum | Lemonyellow False Goldenaster | |
| Heterotheca canescens | Hoary False Goldenaster Gray Golden-aster | |
| Heterotheca fulcrata | Rockyscree False Goldenaster | |
| Heterotheca fulcrata var. amplifolia | Rockyscree False Goldenaster | |
| Heterotheca fulcrata var. arizonica | Arizona False Goldenaster | |
| Heterotheca fulcrata var. fulcrata | Rockyscree False Goldenaster | |
| Heterotheca fulcrata var. senilis | Rockyscree False Goldenaster | |
| scientific name | common name(s) | image gallery |
