Crataegus monogyna, a hawthorn species native to Europe, northwest Africa and western Asia.(noun)
Bursaria spinosa, a small Australian shrub.(noun)
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Use "whitethorn" in a sentence
"I wandered beside hedges of privet and whitethorn and between banks of rosemary and borders of lavender, inhaling their warm scents."
"We could climb over the low-growing hedges of lavender or box or rosemary, but every time he ducked under one of the high, clipped hedges planted in privet or briar or whitethorn, we had to go around."
"The whitethorn or the brown oak are made dearer things to me."