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                  In the following names, the stressed vowel is the one preceding the stress mark. It is not always
                  easy to ascertain where such stress should be placed, especially in the case of epithets derived
                  from personal names. I have tried to follow the principle of maintaining the stress of the original
                  name as outlined in the Jepson Manual, and have abandoned it only when it was just too awkward.
                  In the case of some names, I have listed them twice, reflecting either some disagreement or conflict
                  in the rules of pronunciation, some uncertainty on my part as to the correct pronunciation, or simply
                  that sometimes there is no single correct pronunciation. In other instances, the way I record it is just
                  that which sounds right to my ear.

• xalapen'sis: my original belief was that this was an alternate spelling of halapense or halapensis, meaning of or belonging to Aleppo in northern Syria, which didn't really make sense given that it's a native species, and David Hollombe corrected me with the following: "Veronica peregrina ssp. xalapensis was described from plants collected near Xalapa, Mexico" (ref. Veronica peregrina ssp. xalapensis)
• Xanthis'ma: a Greek name meaning "that which is dyed yellow," in reference to the flowers (ref. genus Xanthisma)
• Xanth'ium: from a Greek word meaning "yellow" (ref. genus Xanthium)
• xan'ti/xantia'na: named for Janos (John) Xantus (1825-1894), a Hungarian who collected in California and Baja (ref. Chorizanthe xanti var. leucotheca, Solanum xanti, Chaenactis xantiana, Clarkia xantiana)
• xerophyl'la/Xerophyl'lum: with dry leaves, alluding to the tough, persistent leaves (ref. genus Xerophyllum, also Clarkia misquinii ssp. xerophylla)
• xerophy'ta: aridity-loving
• xer'os: dry
• xiphio'ides: having the appearance of Xiphium, a Greek name for a Gladiolus, from xiphos, "sword," for the shape of the leaves (ref. Juncus xiphioides)
• xylocan'thus: woody-spined
• xylocar'pa: with woody fruits (ref. Oenothera xylocarpa)
• Xylococ'cus: from xylon, "wood," and kokkos, "a berry," from the stone of the fruit (ref. genus Xylococcus)
• Xylorhi'za: from the Greek xylon, "wood," and rhiza, "root," thus meaning "a woody root" (ref. genus Xylorhiza)