- Adenium Roem. & Schult.
- Adenium obesum (Forssk.) Roem. & Schult.
- Allamanda L.
- Allamanda blanchetii A. DC.
- Allamanda cathartica L.
- Allamanda cathartica L. var. grandiflora (Aubl.) Bailey & C.P. Raffill
- Allamanda hendersonii W. Bull ex Tombrain
- Allamanda schottii Pohl
- Allamanda neriifolia Hook. f.
- Alstonia R. Br.
- Alstonia macrophylla Wallich ex G. Don
- Alyxia Banks ex R. Br.
- Alyxia oliviformis Gaud.
- Alyxia oliviformis Gaud. var. lanceolata Hbd.
- Alyxia oliviformis Gaud. var. myrtillifolia Gray ex Hbd.
- Alyxia oliviformis Gaud. var. ovata Hbd.
- Alyxia torresiana Gaudich.
- Amsonia Walt.
- Amsonia ciliata Walt.
- Amsonia ciliata Walt. var. ciliata
- Amsonia ciliata Walt. var. tenuifolia (Raf.) Woods.
- Amsonia ciliata Walt. var. filifolia Woods.
- Amsonia ciliata Walt. var. texana (Gray) Coult.
- Amsonia fugatei S.P. McLaughlin
- Amsonia grandiflora Alexander
- Amsonia hubrichtii Woods.
- Amsonia illustris Woods.
- Amsonia jonesii Woods.
- Amsonia kearneyana Woods.
- Amsonia longiflora Torr.
- Amsonia longiflora Torr. var. longiflora
- Amsonia longiflora Torr. var. salpignantha (Woods.) S.P. McLaughlin
- Amsonia salpignantha Woods.
- Amsonia ludoviciana Vail
- Amsonia palmeri Gray
- Amsonia hirtella Standl.
- Amsonia hirtella Standl. var. pogonosepala (Woods.) Wiggins
- Amsonia pogonosepala Woods.
- Amsonia standleyi Woods.
- Amsonia peeblesii Woods.
- Amsonia repens Shinners
- Amsonia rigida Shuttlw. ex Small
- Amsonia tabernaemontana Walt.
- Amsonia tabernaemontana Walt. var. gattingeri Woods.
- Amsonia tabernaemontana Walt. var. salicifolia (Pursh) Woods.
- Amsonia salicifolia Pursh
- Amsonia tabernaemontana Walt. var. tabernaemontana
- Amsonia amsonia (L.) Britt.
- Amsonia glaberrima Woods.
- Amsonia tharpii Woods.
- Amsonia tomentosa Torr. & Fr?m.
- Amsonia tomentosa Torr. & Fr?m. var. stenophylla Kearney & Peebles
- Amsonia arenaria Standl.
- Amsonia eastwoodiana Rydb.
- Amsonia tomentosa Torr. & Fr?m. var. tomentosa
- Amsonia brevifolia Gray
- Anechites Griseb.
- Anechites nerium (Aubl.) Urban
- Angadenia Miers
- Angadenia berteroi (A. DC.) Miers
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