| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CRHE5 | Crassula helmsii A. Berger | swamp stonecrop | Crassulaceae
|
| CRLO7 | Crassula longipes (Rose) Bywater & Wickens | smallseed pygmyweed | Crassulaceae
|
| CRMU10 | Crassula multicava Lem. | Cape Province pygmyweed | Crassulaceae
|
| CRMU8 | Crassula muscosa (L.) Roth | Crassula tillaea | Crassulaceae
|
| CROV3 | Crassula ovata (P. Mill.) Druce | jade plant | Crassulaceae
|
| CRPEM | Crassula perfoliata L. var. minor (Haw.) G. D. Rowley | | Crassulaceae
|
| CRPE18 | Crassula perfoliata L. | | Crassulaceae
|
| CRSA7 | Crassula saginoides (Maxim.) Bywater & Wickens | wrinkleseed pygmyweed | Crassulaceae
|
| CRSA14 | Crassula sarcocaulis Eckl. & Zeyh. | | Crassulaceae
|
| CRSI5 | Crassula sieberiana (J.A. Schultes) Druce | Siberian pygmyweed | Crassulaceae
|
| CRSO4 | Crassula solierii (Gray) Meigen | smoothseed pygmyweed | Crassulaceae
|
| CRTI | Crassula tillaea Lester-Garland | moss pygmyweed | Crassulaceae
|
| CRVI6 | Crassula viridis (S. Wats.) Bywater & Wickens | pricklyseed pygmyweed | Crassulaceae
|
| CRASS | Crassula L. | pygmyweed | Crassulaceae
|
| CRAB3 | Crataegus abbreviata Sarg. | Crataegus viridis var. viridis | Rosaceae
|
| CRAB4 | Crataegus aboriginum Sarg. | Crataegus chrysocarpa | Rosaceae
|
| CRAC6 | Crataegus acanthacolonensis Laughlin | Crataegus calpodendron | Rosaceae
|
| CRACI | Crataegus acutifolia Sarg. var. insignis (Sarg.) Palmer | Crataegus crus-galli | Rosaceae
|
| CRAC5 | Crataegus acutifolia Sarg. | Crataegus crus-galli | Rosaceae
|
| CRAE2 | Crataegus aemula Beadle | Rome hawthorn | Rosaceae
|
| CRAE | Crataegus aestivalis (Walt.) Torr. & Gray | may hawthorn | Rosaceae
|
| CRAL7 | Crataegus albicans Ashe | Crataegus mollis | Rosaceae
|
| CRAL4 | Crataegus algens Beadle | Crataegus crus-galli | Rosaceae
|
| CRAL14 | Crataegus alma Beadle | | Rosaceae
|
| CRAL8 | Crataegus alnorum Sarg. | Crataegus schuettei | Rosaceae
|
| CRAM4 | Crataegus ambitiosa Sarg. | Grand Rapids hawthorn | Rosaceae
|
| CRAM6 | Crataegus ambrosia Sarg. | Crataegus succulenta | Rosaceae
|
| CRAM7 | Crataegus amicalis Sarg. | Crataegus viridis var. viridis | Rosaceae
|
| CRAM5 | Crataegus amnicola Beadle | Crataegus penita | Rosaceae
|
| CRAN10 | Crataegus anamesa Sarg. | Fort Bend hawthorn | Rosaceae
|
| CRAN9 | Crataegus ancisa Beadle | Mississippi hawthorn | Rosaceae
|
| CRAN | Crataegus annosa Beadle | Phoenix City hawthorn | Rosaceae
|
| CRAN6 | Crataegus �anomala Sarg. (pro sp.) | | Rosaceae
|
| CRAN14 | Crataegus antiplasta Sarg. | Crataegus anamesa | Rosaceae
|
| CRAPC | Crataegus apiomorpha Sarg. var. cyanophylla (Sarg.) Kruschke | Crataegus apiomorpha | Rosaceae
|
| CRAP4 | Crataegus apiomorpha Sarg. | Fort Sheridan hawthorn | Rosaceae
|
| CRAP3 | Crataegus aprica Beadle | Crataegus flava | Rosaceae
|
| CRARO | Crataegus arborea Beadle var. ohioensis (Sarg.) Kruschke | Crataegus arborea | Rosaceae
|
| CRAR6 | Crataegus arborea Beadle | Montgomery hawthorn | Rosaceae
|
| CRAR14 | Crataegus arbutifolia Ait., non Lam. | Heteromeles arbutifolia var. arbutifolia | Rosaceae
|
| CRAR7 | Crataegus arcana Beadle | Carolina hawthorn | Rosaceae
|
| CRAR10 | Crataegus ardula Sarg. | Crataegus succulenta | Rosaceae
|
| CRAR9 | Crataegus arkansana Sarg. | Crataegus mollis | Rosaceae
|
| CRAR | Crataegus arnoldiana Sarg. | Crataegus anomala | Rosaceae
|
| CRAR8 | Crataegus arrogans Beadle | dixie hawthorn | Rosaceae
|
| CRAS4 | Crataegus ashei Beadle | Crataegus harbisonii | Rosaceae
|
| CRAS5 | Crataegus aspera Sarg. | Crataegus pruinosa | Rosaceae
|
| CRAT3 | Crataegus ater Ashe | Nashville hawthorn | Rosaceae
|
| CRAT4 | Crataegus atrorubens Ashe | Crataegus viridis var. viridis | Rosaceae
|
| CRAU | Crataegus aulica Sarg. | Crataegus pedicellata | Rosaceae
|
| CRAU2 | Crataegus austromontana Beadle | valley head hawthorn | Rosaceae
|
| CRBA10 | Crataegus balkwillii Sarg. | Crataegus scabrida | Rosaceae
|
| CRBA8 | Crataegus barrettiana Sarg. | Crataegus crus-galli | Rosaceae
|
| CRBA9 | Crataegus basilica Beadle | Crataegus schuettei | Rosaceae
|
| CRBE5 | Crataegus beadlei Ashe | Beadle's hawthorn | Rosaceae
|
| CRBEO | Crataegus beata Sarg. var. opulens (Sarg.) Palmer | Crataegus opulens | Rosaceae
|
| CRBE6 | Crataegus beata Sarg. | Dunbar's hawthorn | Rosaceae
|
| CRBE7 | Crataegus beckwithiae Sarg. | Crataegus iracunda | Rosaceae
|
| CRBEE | Crataegus berberifolia Torr. & Gray var. edita (Sarg.) Palmer | Crataegus berberifolia | Rosaceae
|
| CRBE2 | Crataegus berberifolia Torr. & Gray | barberry hawthorn | Rosaceae
|
| CRBI7 | Crataegus bicknellii Egglest. | Crataegus succulenta | Rosaceae
|
| CRBIS | Crataegus biltmoreana Beadle var. stonei (Sarg.) Kruschke | Crataegus intricata | Rosaceae
|
| CRBI5 | Crataegus biltmoreana Beadle | Crataegus intricata | Rosaceae
|
| CRBI4 | Crataegus bisulcata Ashe | Crataegus uniflora | Rosaceae
|
| CRBL2 | Crataegus blanda Sarg. | Crataegus viridis var. viridis | Rosaceae
|
| CRBL3 | Crataegus blothra Laughlin | Crataegus corusca | Rosaceae
|
| CRBO3 | Crataegus bona Sarg. | Berks County hawthorn | Rosaceae
|
| CRBO2 | Crataegus boyntonii Beadle | Crataegus intricata | Rosaceae
|
| CRBR | Crataegus brachyacantha Sarg. & Engelm. | blueberry hawthorn | Rosaceae
|
| CRBR9 | Crataegus brachyphylla Sarg. | Crataegus mollis | Rosaceae
|
| CRBRA | Crataegus brainerdii Sarg. var. asperifolia (Sarg.) Egglest. | Crataegus scabrida | Rosaceae
|
| CRBRC | Crataegus brainerdii Sarg. var. cyclophylla (Sarg.) Palmer | Crataegus scabrida | Rosaceae
|
| CRBRE | Crataegus brainerdii Sarg. var. egglestonii (Sarg.) B.L. Robins. | Crataegus scabrida | Rosaceae
|
| CRBRS | Crataegus brainerdii Sarg. var. scabrida (Sarg.) Egglest. | Crataegus scabrida | Rosaceae
|
| CRBR3 | Crataegus brainerdii Sarg. | Brainerd's hawthorn | Rosaceae
|
| CRBR4 | Crataegus brazoria Sarg. | Brazos hawthorn | Rosaceae
|
| CRBR13 | Crataegus �brevipes Peck (pro sp.) | | Rosaceae
|
| CRBR15 | Crataegus brittonii Egglest. | Crataegus vailiae | Rosaceae
|
| CRBR10 | Crataegus brumalis Ashe | Crataegus iracunda | Rosaceae
|
| CRBRF | Crataegus brunetiana Sarg. var. fernaldii (Sarg.) Palmer | Crataegus chrysocarpa | Rosaceae
|
| CRBR14 | Crataegus brunetiana Sarg. | Crataegus chrysocarpa | Rosaceae
|
| CRBU | Crataegus bushii Sarg. | Crataegus crus-galli | Rosaceae
|
| CRCA20 | Crataegus caesariata Sarg. | Crataegus lumaria | Rosaceae
|
| CRCA19 | Crataegus caliciglabrata Schuette | Crataegus chrysocarpa | Rosaceae
|
| CRCAG | Crataegus calpodendron (Ehrh.) Medik. var. gigantea Kruschke | Crataegus calpodendron | Rosaceae
|
| CRCAG2 | Crataegus calpodendron (Ehrh.) Medik. var. globosa (Sarg.) Palmer | Crataegus calpodendron | Rosaceae
|
| CRCAH | Crataegus calpodendron (Ehrh.) Medik. var. hispida (Sarg.) Palmer | Crataegus calpodendron | Rosaceae
|
| CRCAH2 | Crataegus calpodendron (Ehrh.) Medik. var. hispidula (Sarg.) Palmer | Crataegus calpodendron | Rosaceae
|
| CRCAM2 | Crataegus calpodendron (Ehrh.) Medik. var. microcarpa (Chapman) Palmer | Crataegus calpodendron | Rosaceae
|
| CRCAM3 | Crataegus calpodendron (Ehrh.) Medik. var. mollicula (Sarg.) Palmer | Crataegus calpodendron | Rosaceae
|
| CRCAO | Crataegus calpodendron (Ehrh.) Medik. var. obesa (Ashe) Palmer | Crataegus calpodendron | Rosaceae
|
| CRCA | Crataegus calpodendron (Ehrh.) Medik. | pear hawthorn | Rosaceae
|
| CRCA21 | Crataegus canbyi Sarg. | Crataegus crus-galli | Rosaceae
|
| CRCA22 | Crataegus carrollensis Sarg. | Eureka Springs hawthorn | Rosaceae
|
| CRCE2 | Crataegus celsa Sarg. | Crataegus succulenta | Rosaceae
|
| CRCH8 | Crataegus chadsfordiana Sarg. | Crataegus macrosperma | Rosaceae
|
| CRCH80 | Crataegus champlainensis Sarg. | Crataegus submollis | Rosaceae
|
| CRCH6 | Crataegus chapmanii (Beadle) Ashe | Crataegus calpodendron | Rosaceae
|
| CRCH7 | Crataegus cherokeensis Sarg. | Crataegus crus-galli | Rosaceae
|
| CRCH2 | Crataegus choriophylla Sarg. | Crataegus uniflora | Rosaceae
|
| CRCHA | Crataegus chrysocarpa Ashe var. aboriginum (Sarg.) Kruschke | Crataegus chrysocarpa | Rosaceae
|