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| Zameioscirpus | atacamensis, gaimardiodes, muticus |
| Zannichellia | palustris |
| Zantedeschia | aethiopica |
| Zanthoxylum | armatum, caribaeum ssp. rugosum, coco, externum, fagara ssp. fagara, fagara ssp. culantrilo, kleinii, mayu, monogynum, petiolare, rhoifolium, riedelianum, rigidum ssp. hasslerianum, tingoassuiba |
| Zapoteca | formosa, portoricensis ssp. flavida |
| Zephyra | compacta, elegans |
| Zephyranthes | advena, amambaica, americana, amoena, ananuca, andalgalensis, andina, araucana, aurata, bagnoldii, barrosiana, berteroana, bifida, blumenavia, brachyandra, caaguazuensis, caerulea, calderensis, candida, capivarina, carinata, chacoensis, cisandina, comunelloi, concinna, correntina, crassibulba, diluta, elwesii, estensis, filifolia, flavissima, gilliesiana, graciliflora , gracilifolia, gratissima, guachipensis, ischihualasta, jamesonii, laeta, lagesiana, leonensis, longistyla, maculata, magnoi, martinezii, mataca, mendocensis, mesochloa, microstigma, minima, moelleri, monantha, montana, neumannii, oranensis, paranensis, pedunculosa, philadelphica, phycelloides, picta, riojana, robusta, rubra, ruizlealii, salinarum, saltensis, sanavirone, sarae, schulziana, seubertii, spectabilis, splendens, steyermarkii, tenuiflora, tubispatha, tucumanensis, uruguaianica, venturiana, versicolor |
| Zeuxine | strateumatica |
| Zeyheria | montana, tuberculosa |
| Zinnia | peruviana |
| Zizaniopsis | bonariensis, longhi-wagnerae, microstachya, villanensis |
| Zollernia | ilicifolia, splendens |
| Zootrophion | atropurpureum |
| Zornia | burkartii, contorta, crinita, cryptantha, curvata, fimbriata, glabra, latifolia, multinervosa, orbiculata, pardina, ramboiana, reticulata, sericea, trachycarpa |
| Zostera | chilensis |
| Zuccagnia | punctata |
| Zuloagocardamum | jujuyensis |
| Zygia | cataractae, latifolia var. glabrata, latifolia var. latifolia, morongii, pithecolobioides |
| Zygopetalum | brachypetalum, crinitum, maculatum, maxillare |
| Zygophlebia | longipilosa |
| Zygostates | alleniana, bradei, cornuta, dasyrhiza, lunata, multiflora, pellucida, pustulata |
| Zygostigma | australe |
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