| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| HABR6 | Haplopappus brandegeei Gray | Erigeron aureus | Asteraceae
|
| HABR | Haplopappus brickellioides Blake | Hazardia brickellioides | Asteraceae
|
| HACA4 | Haplopappus canus (Gray) Blake | Hazardia cana | Asteraceae
|
| HACAC2 | Haplopappus carthamoides (Hook.) Gray ssp. cusickii (Gray) Hall | Pyrrocoma carthamoides var. cusickii | Asteraceae
|
| HACAR | Haplopappus carthamoides (Hook.) Gray ssp. rigidus (Rydb.) Hall | Pyrrocoma carthamoides var. carthamoides | Asteraceae
|
| HACAC | Haplopappus carthamoides (Hook.) Gray var. cusickii Gray | Pyrrocoma carthamoides var. cusickii | Asteraceae
|
| HACAE | Haplopappus carthamoides (Hook.) Gray var. erythropappus (Rydb.) St. John | Pyrrocoma carthamoides var. carthamoides | Asteraceae
|
| HACAM3 | Haplopappus carthamoides (Hook.) Gray var. maximus Gray | Pyrrocoma radiata | Asteraceae
|
| HACAR2 | Haplopappus carthamoides (Hook.) Gray var. rigidus (Rydb.) M.E. Peck | Pyrrocoma carthamoides var. carthamoides | Asteraceae
|
| HACAS | Haplopappus carthamoides (Hook.) Gray var. subsquarrosus (Greene) Dorn | Pyrrocoma carthamoides var. subsquarrosa | Asteraceae
|
| HACAT | Haplopappus carthamoides (Hook.) Gray var. typicus (Hall) Cronq. | Pyrrocoma carthamoides var. carthamoides | Asteraceae
|
| HACA5 | Haplopappus carthamoides (Hook.) Gray | Pyrrocoma carthamoides var. carthamoides | Asteraceae
|
| HACE | Haplopappus cervinus S. Wats. | Ericameria cervina | Asteraceae
|
| HACI5 | Haplopappus ciliatus (Nutt.) DC. | Grindelia papposa | Asteraceae
|
| HACL2 | Haplopappus clementis (Rydb.) Blake | Pyrrocoma clementis var. clementis | Asteraceae
|
| HACO5 | Haplopappus coloradoensis (Gray) R.L. Hartman ex Dorn | Machaeranthera coloradoensis var. coloradoensis | Asteraceae
|
| HACO3 | Haplopappus compactus (Hall) L.C. Anders. | Ericameria compacta | Asteraceae
|
| HACO2 | Haplopappus contractus Hall | Pyrrocoma uniflora var. uniflora | Asteraceae
|
| HACO4 | Haplopappus cooperi (Gray) Hall | Ericameria cooperi | Asteraceae
|
| HACO6 | Haplopappus coulteri Harvey & Gray ex Gray | Machaeranthera pinnatifida ssp. pinnatifida var. pinnatifida | Asteraceae
|
| HACR6 | Haplopappus crispus L.C. Anders. | Ericameria crispa | Asteraceae
|
| HACRT | Haplopappus croceus Gray ssp. typicus Hall | Pyrrocoma crocea var. crocea | Asteraceae
|
| HACRG | Haplopappus croceus Gray var. genuflexus (Greene) Blake | Pyrrocoma crocea var. genuflexa | Asteraceae
|
| HACR2 | Haplopappus croceus Gray | Pyrrocoma crocea var. crocea | Asteraceae
|
| HACUS | Haplopappus cuneatus Gray var. spathulatus (Gray) Blake ex Munz | Ericameria cuneata var. spathulata | Asteraceae
|
| HACU2 | Haplopappus cuneatus Gray | Ericameria cuneata var. cuneata | Asteraceae
|
| HADE3 | Haplopappus detonsus (Greene) Raven | Hazardia detonsa | Asteraceae
|
| HADIH | Haplopappus divaricatus (Nutt.) Gray var. hookerianus (Torr. & Gray) Waterfall | Croptilon hookerianum var. hookerianum | Asteraceae
|
| HADI5 | Haplopappus divaricatus (Nutt.) Gray | Croptilon divaricatum | Asteraceae
|
| HADR2 | Haplopappus drummondii (Torr. & Gray) Blake | Isocoma drummondii | Asteraceae
|
| HAEA | Haplopappus eastwoodiae Hall | Ericameria fasciculata | Asteraceae
|
| HAEN | Haplopappus engelmannii (Gray) Hall | Oonopsis engelmannii | Asteraceae
|
| HAERB | Haplopappus ericoides (Less.) Hook. & Arn. ssp. blakei C.B. Wolf | Ericameria ericoides | Asteraceae
|
| HAER | Haplopappus ericoides (Less.) Hook. & Arn. | Ericameria ericoides | Asteraceae
|
| HAEXP2 | Haplopappus eximius Hall ssp. peirsonii Keck | Tonestus peirsonii | Asteraceae
|
| HAEX | Haplopappus eximius Hall | Tonestus eximius | Asteraceae
|
| HAFRM | Haplopappus fremontii (Gray) Greene ssp. monocephalus (A. Nels.) Hall | Oonopsis foliosa var. monocephala | Asteraceae
|
| HAFRT | Haplopappus fremontii (Gray) Greene ssp. typicus Hall | Oonopsis foliosa var. foliosa | Asteraceae
|
| HAFRW | Haplopappus fremontii (Gray) Greene ssp. wardii (Gray) Hall | Oonopsis wardii | Asteraceae
|
| HAFR2 | Haplopappus fremontii (Gray) Greene | Oonopsis foliosa var. foliosa | Asteraceae
|
| HAGI | Haplopappus gilmanii Blake | Ericameria gilmanii | Asteraceae
|
| HAGO2 | Haplopappus gooddingii (A. Nels.) Munz & Johnston | Machaeranthera pinnatifida ssp. gooddingii var. gooddingii | Asteraceae
|
| HAGR11 | Haplopappus gracilis (Nutt.) Gray | Machaeranthera gracilis | Asteraceae
|
| HAGR7 | Haplopappus graniticus Tiehm & L. Shultz | Tonestus graniticus | Asteraceae
|
| HAGRM | Haplopappus greenei Gray var. mollis Gray | Ericameria greenei | Asteraceae
|
| HAGR6 | Haplopappus greenei Gray | Ericameria greenei | Asteraceae
|
| HAHA | Haplopappus hallii Gray | Columbiadoria hallii | Asteraceae
|
| HAHA7 | Haplopappus havardii Waterfall | Machaeranthera viscida | Asteraceae
|
| HAHE2 | Haplopappus heterophyllus (Gray) Blake | Isocoma pluriflora | Asteraceae
|
| HAHIL2 | Haplopappus hirtus Gray ssp. lanulosus (Greene) Hall | Pyrrocoma hirta var. lanulosa | Asteraceae
|
| HAHIS2 | Haplopappus hirtus Gray ssp. sonchifolius (Greene) Hall | Pyrrocoma hirta var. sonchifolia | Asteraceae
|
| HAHIT | Haplopappus hirtus Gray ssp. typicus Hall | Pyrrocoma hirta var. hirta | Asteraceae
|
| HAHIL | Haplopappus hirtus Gray var. lanulosus (Greene) M.E. Peck | Pyrrocoma hirta var. lanulosa | Asteraceae
|
| HAHIS | Haplopappus hirtus Gray var. sonchifolius (Greene) M.E. Peck | Pyrrocoma hirta var. sonchifolia | Asteraceae
|
| HAHI | Haplopappus hirtus Gray | Pyrrocoma hirta var. hirta | Asteraceae
|
| HAIN2 | Haplopappus insecticruris (Henderson) Heller | Pyrrocoma insecticruris | Asteraceae
|
| HAINI | Haplopappus integrifolius Porter ex Gray ssp. insecticruris (Henderson) Hall | Pyrrocoma insecticruris | Asteraceae
|
| HAINL | Haplopappus integrifolius Porter ex Gray ssp. liatriformis (Greene) Hall | Pyrrocoma liatriformis | Asteraceae
|
| HAINS | Haplopappus integrifolius Porter ex Gray ssp. scaberulus (Greene) Hall | Pyrrocoma liatriformis | Asteraceae
|
| HAINT | Haplopappus integrifolius Porter ex Gray ssp. typicus Hall | Pyrrocoma integrifolia | Asteraceae
|
| HAIN3 | Haplopappus integrifolius Porter ex Gray | Pyrrocoma integrifolia | Asteraceae
|
| HAJU | Haplopappus junceus Greene | Machaeranthera juncea | Asteraceae
|
| HALAS | Haplopappus lanceolatus (Hook.) Torr. & Gray ssp. solidagineus (Greene) Hall | Pyrrocoma lanceolata var. lanceolata | Asteraceae
|
| HALAT | Haplopappus lanceolatus (Hook.) Torr. & Gray ssp. tenuicaulis (D.C. Eat.) Hall | Pyrrocoma lanceolata var. lanceolata | Asteraceae
|
| HALAV | Haplopappus lanceolatus (Hook.) Torr. & Gray ssp. vaseyi (Parry ex D.C. Eat.) Hall | Pyrrocoma lanceolata var. lanceolata | Asteraceae
|
| HALAS2 | Haplopappus lanceolatus (Hook.) Torr. & Gray var. sublanatus Cody | Pyrrocoma lanceolata var. lanceolata | Asteraceae
|
| HALAT2 | Haplopappus lanceolatus (Hook.) Torr. & Gray var. tenuicaulis (D.C. Eat.) Gray | Pyrrocoma lanceolata var. lanceolata | Asteraceae
|
| HALAT3 | Haplopappus lanceolatus (Hook.) Torr. & Gray var. typicus (Hall) Cronq. | Pyrrocoma lanceolata var. lanceolata | Asteraceae
|
| HALAV2 | Haplopappus lanceolatus (Hook.) Torr. & Gray var. vaseyi Parry ex D.C. Eat. | Pyrrocoma lanceolata var. lanceolata | Asteraceae
|
| HALA2 | Haplopappus lanceolatus (Hook.) Torr. & Gray | Pyrrocoma lanceolata var. lanceolata | Asteraceae
|
| HALAA2 | Haplopappus lanuginosus Gray ssp. andersonii (Rydb.) Hall | Stenotus lanuginosus var. andersonii | Asteraceae
|
| HALAT4 | Haplopappus lanuginosus Gray ssp. typicus Hall | Stenotus lanuginosus var. lanuginosus | Asteraceae
|
| HALAA | Haplopappus lanuginosus Gray var. andersonii (Rydb.) Cronq. | Stenotus lanuginosus var. andersonii | Asteraceae
|
| HALA3 | Haplopappus lanuginosus Gray | Stenotus lanuginosus var. lanuginosus | Asteraceae
|
| HALA5 | Haplopappus laricifolius Gray | Ericameria laricifolia | Asteraceae
|
| HALE7 | Haplopappus leverichii Cronq. | Isocoma humilis | Asteraceae
|
| HALI2 | Haplopappus liatriformis (Greene) St. John | Pyrrocoma liatriformis | Asteraceae
|
| HALI8 | Haplopappus lignumviridis Welsh | Ericameria lignumviridis | Asteraceae
|
| HALII | Haplopappus linearifolius DC. ssp. interior (Coville) Hall | Ericameria linearifolia | Asteraceae
|
| HALII2 | Haplopappus linearifolius DC. var. interior (Coville) M.E. Jones | Ericameria linearifolia | Asteraceae
|
| HALI5 | Haplopappus linearifolius DC. | Ericameria linearifolia | Asteraceae
|
| HALU | Haplopappus lucidus (Keck) Keck | Pyrrocoma lucida | Asteraceae
|
| HALY | Haplopappus lyallii Gray | Tonestus lyallii | Asteraceae
|
| HAMAC | Haplopappus macronema (Nutt.) Gray var. canescens (A. Nels.) Cronq. | Ericameria discoidea var. linearis | Asteraceae
|
| HAMAL | Haplopappus macronema (Nutt.) Gray var. linearis (Rydb.) Dorn | Ericameria discoidea var. linearis | Asteraceae
|
| HAMAT | Haplopappus macronema (Nutt.) Gray var. typicus Hall | Ericameria discoidea var. discoidea | Asteraceae
|
| HAMA2 | Haplopappus macronema (Nutt.) Gray | Ericameria discoidea var. discoidea | Asteraceae
|
| HAMI2 | Haplopappus microcephalus Cronq. | Tonestus microcephalus | Asteraceae
|
| HAMU3 | Haplopappus multicaulis (Nutt.) Gray | Oonopsis multicaulis | Asteraceae
|
| HANA | Haplopappus nanus (Nutt.) D.C. Eat. | Ericameria nana | Asteraceae
|
| HANUD | Haplopappus nuttallii Torr. & Gray var. depressus Maguire | Machaeranthera grindelioides var. depressa | Asteraceae
|
| HANU2 | Haplopappus nuttallii Torr. & Gray | Machaeranthera grindelioides var. grindelioides | Asteraceae
|
| HAOP | Haplopappus ophitidis (J.T. Howell) Keck | Ericameria ophitidis | Asteraceae
|
| HAPAP3 | Haplopappus palmeri Gray ssp. pachylepis Hall | Ericameria palmeri var. pachylepis | Asteraceae
|
| HAPA8 | Haplopappus palmeri Gray | Ericameria palmeri var. palmeri | Asteraceae
|
| HAPAV | Haplopappus paniculatus (Nutt.) Gray var. virgatus Gray | Pyrrocoma racemosa var. paniculata | Asteraceae
|
| HAPA5 | Haplopappus parishii (Greene) Blake | Ericameria parishii | Asteraceae
|
| HAPA9 | Haplopappus parryi Gray | Oreochrysum parryi | Asteraceae
|
| HAPE3 | Haplopappus peirsonii (Keck) J.T. Howell | Tonestus peirsonii | Asteraceae
|
| HAPHA | Haplopappus phyllocephalus DC. ssp. annuus (Rydb.) Hall | Rayjacksonia annua | Asteraceae
|
| HAPHA2 | Haplopappus phyllocephalus DC. var. annuus (Rydb.) Waterfall | Rayjacksonia annua | Asteraceae
|