| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CRFE7 | Crataegus fera Beadle | Crataegus berberifolia | Rosaceae
|
| CRFE8 | Crataegus ferrissii Ashe | Crataegus schuettei | Rosaceae
|
| CRFE6 | Crataegus ferta Sarg. | Crataegus succulenta | Rosaceae
|
| CRFI2 | Crataegus filipes Ashe | Crataegus jesupii | Rosaceae
|
| CRFLD | Crataegus flabellata (Spach) Kirchn. var. densiflora (Sarg.) Kruschke | Crataegus flabellata | Rosaceae
|
| CRFLG | Crataegus flabellata (Spach) Kirchn. var. grayana (Egglest.) Palmer | Crataegus flabellata | Rosaceae
|
| CRFL | Crataegus flabellata (Spach) Kirchn. | fanleaf hawthorn | Rosaceae
|
| CRFL2 | Crataegus flava Ait. | yellowleaf hawthorn | Rosaceae
|
| CRFL9 | Crataegus flavida Sarg. | Crataegus dodgei | Rosaceae
|
| CRFL11 | Crataegus floridana Sarg. | Crataegus flava | Rosaceae
|
| CRFLC | Crataegus florifera Sarg. var. celsa (Sarg.) Kruschke | Crataegus succulenta | Rosaceae
|
| CRFLM | Crataegus florifera Sarg. var. mortonis (Laughlin) Kruschke | Crataegus succulenta | Rosaceae
|
| CRFLS | Crataegus florifera Sarg. var. shirleyensis (Sarg.) Kruschke | Crataegus succulenta | Rosaceae
|
| CRFLV | Crataegus florifera Sarg. var. virilis (Sarg.) Kruschke | Crataegus succulenta | Rosaceae
|
| CRFL10 | Crataegus florifera Sarg. | Crataegus succulenta | Rosaceae
|
| CRFL22 | Crataegus fluviatilis Sarg. | Crataegus macrosperma | Rosaceae
|
| CRFO5 | Crataegus foetida Ashe | Crataegus intricata | Rosaceae
|
| CRFO3 | Crataegus fontanesiana (Spach) Steud. | Crataegus calpodendron | Rosaceae
|
| CRFO6 | Crataegus fontanesiana auct. non (Spach) Steud. | Crataegus crus-galli | Rosaceae
|
| CRFO7 | Crataegus formosa Sarg. | Crataegus pruinosa | Rosaceae
|
| CRFO4 | Crataegus fortunata Sarg. | Crataegus intricata | Rosaceae
|
| CRFR3 | Crataegus fragilis Beadle | fragile hawthorn | Rosaceae
|
| CRFR4 | Crataegus franklinensis Sarg. | Crataegus dissona | Rosaceae
|
| CRFR5 | Crataegus fretalis Sarg. | Crataegus macrosperma | Rosaceae
|
| CRFUC | Crataegus fulleriana Sarg. var. chippewaensis (Sarg.) Kruschke | Crataegus fulleriana | Rosaceae
|
| CRFUG | Crataegus fulleriana Sarg. var. gigantea Kruschke | Crataegus fulleriana | Rosaceae
|
| CRFUM | Crataegus fulleriana Sarg. var. miranda (Sarg.) Kruschke | Crataegus fulleriana | Rosaceae
|
| CRFU2 | Crataegus fulleriana Sarg. | Fuller's hawthorn | Rosaceae
|
| CRFU3 | Crataegus furtiva Beadle | Albany hawthorn | Rosaceae
|
| CRGAR | Crataegus gattingeri Ashe var. rigida Palmer | Crataegus pruinosa | Rosaceae
|
| CRGA4 | Crataegus gattingeri Ashe | Crataegus pruinosa | Rosaceae
|
| CRGA3 | Crataegus gaudens Sarg. | Crataegus pruinosa | Rosaceae
|
| CRGE2 | Crataegus gemmosa Sarg. | Crataegus succulenta | Rosaceae
|
| CRGE5 | Crataegus georgiana Sarg. | Crataegus pruinosa | Rosaceae
|
| CRGL10 | Crataegus glabriuscula Sarg. | Crataegus viridis var. viridis | Rosaceae
|
| CRGL4 | Crataegus glareosa Ashe | Port Huron hawthorn | Rosaceae
|
| CRGL9 | Crataegus globosa Sarg. | Crataegus calpodendron | Rosaceae
|
| CRGR13 | Crataegus grandis Ashe | grand hawthorn | Rosaceae
|
| CRGR10 | Crataegus gravida Beadle | Crataegus mollis | Rosaceae
|
| CRGR11 | Crataegus gravis Ashe | Crataegus prona | Rosaceae
|
| CRGR9 | Crataegus grayana Egglest. | Crataegus flabellata | Rosaceae
|
| CRGR8 | Crataegus gregalis Beadle | Crataegus uniflora | Rosaceae
|
| CRGR2 | Crataegus greggiana Egglest. | Gregg's hawthorn | Rosaceae
|
| CRHA6 | Crataegus habereri Sarg. | Crataegus pedicellata | Rosaceae
|
| CRHA7 | Crataegus hadleyana Sarg. | Crataegus scabrida | Rosaceae
|
| CRHA3 | Crataegus �haemacarpa Ashe (pro sp.) | | Rosaceae
|
| CRHA5 | Crataegus hannibalensis Palmer | Crataegus crus-galli | Rosaceae
|
| CRHA2 | Crataegus harbisonii Beadle | Harbison's hawthorn | Rosaceae
|
| CRHA8 | Crataegus harryi Sarg. | Crataegus jonesiae | Rosaceae
|
| CRHA4 | Crataegus harveyana Sarg. | Harvey's hawthorn | Rosaceae
|
| CRHE3 | Crataegus helvina Ashe | Clarkton hawthorn | Rosaceae
|
| CRHI3 | Crataegus hillii Sarg. | Crataegus corusca | Rosaceae
|
| CRHI4 | Crataegus hirtiflora Sarg. | Crataegus lettermanii | Rosaceae
|
| CRHOA | Crataegus holmesiana Ashe var. amicta (Ashe) Palmer | Crataegus holmesiana | Rosaceae
|
| CRHOC | Crataegus holmesiana Ashe var. chippewaensis (Sarg.) Palmer | Crataegus fulleriana | Rosaceae
|
| CRHOM | Crataegus holmesiana Ashe var. magniflora (Sarg.) Palmer | Crataegus fulleriana | Rosaceae
|
| CRHOV2 | Crataegus holmesiana Ashe var. villipes Ashe | Crataegus holmesiana | Rosaceae
|
| CRHO5 | Crataegus holmesiana Ashe | Holmes' hawthorn | Rosaceae
|
| CRHO6 | Crataegus horseyi Palmer | Crataegus intricata | Rosaceae
|
| CRHU3 | Crataegus �hudsonica Sarg. (pro sp.) | | Rosaceae
|
| CRID | Crataegus ideae Sarg. | Concord hawthorn | Rosaceae
|
| CRIG2 | Crataegus ignave Beadle | Bedford Springs hawthorn | Rosaceae
|
| CRIL | Crataegus illecebrosa Sarg. | Crataegus fulleriana | Rosaceae
|
| CRIL3 | Crataegus illuminata Sarg. | Crataegus chrysocarpa | Rosaceae
|
| CRIM | Crataegus �immanis Ashe (pro sp.) | | Rosaceae
|
| CRIM6 | Crataegus impar Beadle | redclay hawthorn | Rosaceae
|
| CRIM5 | Crataegus improvisa Sarg. | Crataegus scabrida | Rosaceae
|
| CRIN26 | Crataegus inanis Beadle | oldmaid hawthorn | Rosaceae
|
| CRIN10 | Crataegus �incaedua Sarg. (pro sp.) | | Rosaceae
|
| CRIN27 | Crataegus incerta Sarg. | Crataegus succulenta | Rosaceae
|
| CRIN20 | Crataegus incisa Sarg. | Crataegus dissona | Rosaceae
|
| CRIN16 | Crataegus indicens Ashe | Mansfield hawthorn | Rosaceae
|
| CRIN22 | Crataegus induta Sarg. | Crataegus mollis | Rosaceae
|
| CRIN2 | Crataegus ingens Beadle | Crataegus viridis var. viridis | Rosaceae
|
| CRIN17 | Crataegus insidiosa Beadle | Ozark hawthorn | Rosaceae
|
| CRIN24 | Crataegus insolens Sarg. | Crataegus lucorum | Rosaceae
|
| CRIN18 | Crataegus integra Beadle | Lake Ella hawthorn | Rosaceae
|
| CRIN11 | Crataegus integriloba Sarg. | Crataegus succulenta | Rosaceae
|
| CRIN21 | Crataegus interior Beadle | Crataegus viridis var. viridis | Rosaceae
|
| CRINB | Crataegus intricata Lange var. boyntonii (Beadle) Kruschke | Crataegus intricata | Rosaceae
|
| CRINN | Crataegus intricata Lange var. neobushii (Sarg.) Kruschke | Crataegus intricata | Rosaceae
|
| CRINR | Crataegus intricata Lange var. rubella (Beadle) Kruschke | Crataegus intricata | Rosaceae
|
| CRINS | Crataegus intricata Lange var. straminea (Beadle) Palmer | Crataegus intricata | Rosaceae
|
| CRIN3 | Crataegus intricata Lange | Copenhagen hawthorn | Rosaceae
|
| CRIN19 | Crataegus invicta Beadle | Fulton hawthorn | Rosaceae
|
| CRIN23 | Crataegus invisa Sarg. | Crataegus mollis | Rosaceae
|
| CRIRB | Crataegus iracunda Beadle var. brumalis (Ashe) Kruschke | Crataegus iracunda | Rosaceae
|
| CRIRD | Crataegus iracunda Beadle var. diffusa (Sarg.) Kruschke | Crataegus iracunda | Rosaceae
|
| CRIRP | Crataegus iracunda Beadle var. populnea (Ashe) Kruschke | Crataegus iracunda | Rosaceae
|
| CRIRS | Crataegus iracunda Beadle var. silvicola (Beadle) Palmer | Crataegus iracunda | Rosaceae
|
| CRIRS2 | Crataegus iracunda Beadle var. stolonifera (Sarg.) Kruschke | Crataegus iracunda | Rosaceae
|
| CRIR | Crataegus iracunda Beadle | stolonbearing hawthorn | Rosaceae
|
| CRIRB2 | Crataegus irrasa Sarg. var. blanchardii (Sarg.) Egglest. | Crataegus irrasa | Rosaceae
|
| CRIR2 | Crataegus irrasa Sarg. | Blanchard's hawthorn | Rosaceae
|
| CRIT | Crataegus iterata Sarg. | Crataegus scabrida | Rosaceae
|
| CRJA6 | Crataegus jackii Sarg. | Crataegus chrysocarpa | Rosaceae
|
| CRJE | Crataegus jesupii Sarg. | Jesup's hawthorn | Rosaceae
|
| CRJOB | Crataegus jonesiae Sarg. var. brownietta (Sarg.) Kruschke | Crataegus jonesiae | Rosaceae
|
| CRJOH | Crataegus jonesiae Sarg. var. harryi (Sarg.) Kruschke | Crataegus jonesiae | Rosaceae
|
| CRJO3 | Crataegus jonesiae Sarg. | Miss Jones' hawthorn | Rosaceae
|
| CRKE5 | Crataegus kellermanii Sarg. | Crataegus suborbiculata | Rosaceae
|