Atriplex prostrata Boucher ex DC. (Spear-leaved Orache) and A. littoralis L. (Grass-leaved Orache) are two distinct taxa. Observations on their hybrid A. x hulmeana Taschereau suggest variation relates to hybridisation, backcrossing and or segregation. These features may also relate to difficulties in identifying other species and hybrid combinations.
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Michael D. Wilcox (2022) studied this question.
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