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| Wahlenbergia | berteroi, brasiliensis, calycina, fernandeziana, grahamiae, linarioides, marginata, masafuerae, peruviana, tuberosa |
| Waltheria | albicans, carmensarae, carpinifolia, communis, indica, macrophylla, operculata, ovata, procumbens, viscosissima |
| Warmingia | eugenii |
| Warrea | warreana |
| Watsonia | borbonica ssp. ardernei |
| Weberbauera | densifolia, herzogii, orophila, peruviana |
| Weberbauerella | chilensis |
| Wedelia | brachylepis, buphtalmiflora, holwayi, kerrii, monantha, saltensis, trichostephia |
| Weingartia | neumanniana |
| Weinmannia | boliviensis, discolor, humilis, organensis, paulliniifolia, pinnata, trichosperma |
| Werneria | apiculata, aretioides, cochlearis, digitata, glaberrima, incisa, juniperina, lorochaqui, nubigera, orbignyana, poposa, praetermissa, pseudodigitata, pumila, pygmaea var. pygmaea, rosenii, solivifolia, spathulata, villosa, weddellii |
| Wettsteiniola | apipensis, pinnata |
| Wigginsia | calvescens, corynodes, erinacea, gladiata , pauciareolata, schaeferiana, sessiliflora, tephracantha |
| Wilbrandia | ebracteata var. bracteata, ebracteata var. ebracteata, ebracteata var. pedunculata, hibiscoides, longisepala, verticillata |
| Willkommia | texana |
| Wissadula | contracta, decora, densiflora var. densiflora, densiflora var. schulzii, excelsior, glechomifolia, gymnanthemum, hernandioides, indivisa, krapovickasiana, macrantha var. macrantha, macrantha var. brevipedunculata, paraguariensis, parviflora, periplocifolia, setifera, tucumanensis, wissadifolia |
| Wittmackia | bicolor |
| Wittrockia | cyathiformis, superba |
| Wolffia | brasiliensis, columbiana |
| Wolffiella | lingulata, oblonga |
| Wullschlaegelia | aphylla |
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