| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ASCRD2 | Asclepias cryptoceras S. Wats. ssp. davisii (Woods.) Woods. | Davis' milkweed | Asclepiadaceae
|
| ASCRD | Asclepias cryptoceras S. Wats. var. davisii (Woods.) W.H. Baker | Asclepias cryptoceras ssp. davisii | Asclepiadaceae
|
| ASCR | Asclepias cryptoceras S. Wats. | pallid milkweed | Asclepiadaceae
|
| ASCU | Asclepias curassavica L. | bloodflower | Asclepiadaceae
|
| ASCU8 | Asclepias curtissii Gray | Curtiss' milkweed | Asclepiadaceae
|
| ASCU9 | Asclepias cutleri Woods. | Cutler's milkweed | Asclepiadaceae
|
| ASDA2 | Asclepias davisii Woods. | Asclepias cryptoceras ssp. davisii | Asclepiadaceae
|
| ASDE16 | Asclepias decumbens (Nutt.) Dcne. | Asclepias asperula ssp. capricornu | Asclepiadaceae
|
| ASEA3 | Asclepias eastwoodiana Barneby | Asclepias uncialis ssp. ruthiae | Asclepiadaceae
|
| ASEL | Asclepias elata Benth. | Asclepias glaucescens | Asclepiadaceae
|
| ASEM | Asclepias emoryi (Greene) Vail | Emory's milkweed | Asclepiadaceae
|
| ASENR | Asclepias engelmanniana Woods. var. rusbyi (Vail) Kearney | Asclepias rusbyi | Asclepiadaceae
|
| ASEN | Asclepias engelmanniana Woods. | Engelmann's milkweed | Asclepiadaceae
|
| ASERM2 | Asclepias eriocarpa Benth. var. microcarpa Munz & Johnston | Asclepias eriocarpa | Asclepiadaceae
|
| ASER | Asclepias eriocarpa Benth. | woollypod milkweed | Asclepiadaceae
|
| ASER2 | Asclepias erosa Torr. | desert milkweed | Asclepiadaceae
|
| ASEX | Asclepias exaltata L. | poke milkweed | Asclepiadaceae
|
| ASFA | Asclepias fascicularis Dcne. | Mexican whorled milkweed | Asclepiadaceae
|
| ASFE4 | Asclepias feayi Chapman ex Gray | Florida milkweed | Asclepiadaceae
|
| ASFR5 | Asclepias fremontii Torr. ex Gray | Asclepias eriocarpa | Asclepiadaceae
|
| ASGA4 | Asclepias galioides auct. non Kunth | Asclepias subverticillata | Asclepiadaceae
|
| ASGI6 | Asclepias giffordii Eastw. | Asclepias speciosa | Asclepiadaceae
|
| ASGL5 | Asclepias glaucescens Kunth | nodding milkweed | Asclepiadaceae
|
| ASHA6 | Asclepias hallii Gray | Hall's milkweed | Asclepiadaceae
|
| ASHI | Asclepias hirtella (Pennell) Woods. | green milkweed | Asclepiadaceae
|
| ASHU3 | Asclepias humistrata Walt. | pinewoods milkweed | Asclepiadaceae
|
| ASHY5 | Asclepias hypoleuca (Gray) Woods. | mahogany milkweed | Asclepiadaceae
|
| ASINI | Asclepias incarnata L. ssp. incarnata | swamp milkweed | Asclepiadaceae
|
| ASINP2 | Asclepias incarnata L. ssp. pulchra (Ehrh. ex Willd.) Woods. | swamp milkweed | Asclepiadaceae
|
| ASINN | Asclepias incarnata L. var. neoscotica Fern. | Asclepias incarnata ssp. pulchra | Asclepiadaceae
|
| ASINP | Asclepias incarnata L. var. pulchra (Ehrh. ex Willd.) Pers. | Asclepias incarnata ssp. pulchra | Asclepiadaceae
|
| ASIN | Asclepias incarnata L. | swamp milkweed | Asclepiadaceae
|
| ASIN13 | Asclepias intermedia Vail | Asclepias syriaca | Asclepiadaceae
|
| ASIN14 | Asclepias involucrata Engelm. ex Torr. | dwarf milkweed | Asclepiadaceae
|
| ASKA3 | Asclepias kansana Vail | Asclepias syriaca | Asclepiadaceae
|
| ASLA | Asclepias labriformis M.E. Jones | Utah milkweed | Asclepiadaceae
|
| ASLAP3 | Asclepias lanceolata Walt. var. paupercula (Michx.) Fern. | Asclepias lanceolata | Asclepiadaceae
|
| ASLA2 | Asclepias lanceolata Walt. | fewflower milkweed | Asclepiadaceae
|
| ASLA3 | Asclepias lanuginosa Nutt. | sidecluster milkweed | Asclepiadaceae
|
| ASLA4 | Asclepias latifolia (Torr.) Raf. | broadleaf milkweed | Asclepiadaceae
|
| ASLA15 | Asclepias laurifolia Michx. | Asclepias rubra | Asclepiadaceae
|
| ASLE13 | Asclepias lemmonii Gray | Lemmon's milkweed | Asclepiadaceae
|
| ASLI6 | Asclepias linaria Cav. | pineneedle milkweed | Asclepiadaceae
|
| ASLI | Asclepias linearis Scheele | slim milkweed | Asclepiadaceae
|
| ASLOH2 | Asclepias longifolia Michx. var. hirtella (Pennell) Farmer & Bell | Asclepias hirtella | Asclepiadaceae
|
| ASLO | Asclepias longifolia Michx. | longleaf milkweed | Asclepiadaceae
|
| ASMA10 | Asclepias macrosperma Eastw. | Asclepias involucrata | Asclepiadaceae
|
| ASMA | Asclepias macrotis Torr. | longhood milkweed | Asclepiadaceae
|
| ASME | Asclepias meadii Torr. ex Gray | Mead's milkweed | Asclepiadaceae
|
| ASME11 | Asclepias mexicana auct. non Cav. | Asclepias fascicularis | Asclepiadaceae
|
| ASMI12 | Asclepias michauxii Dcne. | Michaux's milkweed | Asclepiadaceae
|
| ASNI3 | Asclepias nivea L. | Caribbean milkweed | Asclepiadaceae
|
| ASNU | Asclepias nummularia Torr. | tufted milkweed | Asclepiadaceae
|
| ASNY | Asclepias nyctaginifolia Gray | Mojave milkweed | Asclepiadaceae
|
| ASOB | Asclepias obovata Ell. | pineland milkweed | Asclepiadaceae
|
| ASOE | Asclepias oenotheroides Cham. & Schlecht. | zizotes milkweed | Asclepiadaceae
|
| ASOT | Asclepias otarioides auct. non Fourn. | Asclepias lanuginosa | Asclepiadaceae
|
| ASOV | Asclepias ovalifolia Dcne. | oval-leaf milkweed | Asclepiadaceae
|
| ASPE8 | Asclepias pedicellata Walt. | savannah milkweed | Asclepiadaceae
|
| ASPE | Asclepias perennis Walt. | aquatic milkweed | Asclepiadaceae
|
| ASPH2 | Asclepias physocarpa (E. Mey.) Schlechter | balloonplant | Asclepiadaceae
|
| ASPH3 | Asclepias phytolaccoides Pursh | Asclepias exaltata | Asclepiadaceae
|
| ASPR15 | Asclepias procera Ait. | Calotropis procera | Asclepiadaceae
|
| ASPR9 | Asclepias prostrata Blackwell | prostrate milkweed | Asclepiadaceae
|
| ASPU13 | Asclepias pulchra Ehrh. ex Willd. | Asclepias incarnata ssp. pulchra | Asclepiadaceae
|
| ASPU | Asclepias pumila (Gray) Vail | plains milkweed | Asclepiadaceae
|
| ASPU2 | Asclepias purpurascens L. | purple milkweed | Asclepiadaceae
|
| ASQU | Asclepias quadrifolia Jacq. | fourleaf milkweed | Asclepiadaceae
|
| ASQU2 | Asclepias quinquedentata Gray | slimpod milkweed | Asclepiadaceae
|
| ASRO6 | Asclepias rolfsii Britt. ex Vail | Asclepias tuberosa ssp. rolfsii | Asclepiadaceae
|
| ASRU | Asclepias rubra L. | red milkweed | Asclepiadaceae
|
| ASRU6 | Asclepias rusbyi (Vail) Woods. | Rusby's milkweed | Asclepiadaceae
|
| ASRU7 | Asclepias ruthiae Maguire | Asclepias uncialis ssp. ruthiae | Asclepiadaceae
|
| ASSA8 | Asclepias sanjuanensis Heil, J.M. Porter & Welsh | Asclepias uncialis ssp. ruthiae | Asclepiadaceae
|
| ASSC9 | Asclepias scaposa Vail | Bear Mountain milkweed | Asclepiadaceae
|
| ASSO | Asclepias solanoana Woods. | serpentine milkweed | Asclepiadaceae
|
| ASSP | Asclepias speciosa Torr. | showy milkweed | Asclepiadaceae
|
| ASSP2 | Asclepias sperryi Woods. | Sperry's milkweed | Asclepiadaceae
|
| ASST | Asclepias stenophylla Gray | slimleaf milkweed | Asclepiadaceae
|
| ASSU | Asclepias subulata Dcne. | rush milkweed | Asclepiadaceae
|
| ASSU2 | Asclepias subverticillata (Gray) Vail | horsetail milkweed | Asclepiadaceae
|
| ASSU3 | Asclepias sullivantii Engelm. ex Gray | prairie milkweed | Asclepiadaceae
|
| ASSYK | Asclepias syriaca L. var. kansana (Vail) Palmer & Steyermark | Asclepias syriaca | Asclepiadaceae
|
| ASSY | Asclepias syriaca L. | common milkweed | Asclepiadaceae
|
| ASTE | Asclepias texana Heller | Texas milkweed | Asclepiadaceae
|
| ASTO | Asclepias tomentosa Ell. | tuba milkweed | Asclepiadaceae
|
| ASTUI | Asclepias tuberosa L. ssp. interior Woods. | butterfly milkweed | Asclepiadaceae
|
| ASTUR | Asclepias tuberosa L. ssp. rolfsii (Britt. ex Vail) Woods. | Rolfs' milkweed | Asclepiadaceae
|
| ASTUT | Asclepias tuberosa L. ssp. terminalis Woods. | Asclepias tuberosa ssp. interior | Asclepiadaceae
|
| ASTUT2 | Asclepias tuberosa L. ssp. tuberosa | butterfly milkweed | Asclepiadaceae
|
| ASTUI2 | Asclepias tuberosa L. var. interior (Woods.) Shinners | Asclepias tuberosa ssp. interior | Asclepiadaceae
|
| ASTU | Asclepias tuberosa L. | butterfly milkweed | Asclepiadaceae
|
| ASUNR | Asclepias uncialis Greene ssp. ruthiae (Maguire) Kartesz & Gandhi | Ruth's milkweed | Asclepiadaceae
|
| ASUNU2 | Asclepias uncialis Greene ssp. uncialis | wheel milkweed | Asclepiadaceae
|
| ASUNR2 | Asclepias uncialis Greene var. ruthiae (Maguire) E. Sundell | Asclepias uncialis ssp. ruthiae | Asclepiadaceae
|
| ASUN4 | Asclepias uncialis Greene | wheel milkweed | Asclepiadaceae
|
| ASVA | Asclepias variegata L. | redring milkweed | Asclepiadaceae
|
| ASVE | Asclepias verticillata L. | whorled milkweed | Asclepiadaceae
|
| ASVEP | Asclepias vestita Hook. & Arn. ssp. parishii (Jepson) Woods. | Parish's woolly milkweed | Asclepiadaceae
|
| ASVEV | Asclepias vestita Hook. & Arn. ssp. vestita | woolly milkweed | Asclepiadaceae
|
| ASVEP2 | Asclepias vestita Hook. & Arn. var. parishii Jepson | Asclepias vestita ssp. parishii | Asclepiadaceae
|