A revision of the eight native Moroccan species of Lavandula L. section Pterostoechas Ging., based on herbarium studies, SEM photographs, and field observations, is presented utilising morphological, phenological and ecological characters. Within Lavandula of Morocco, L. sect. Pterostoechas with six species is the most diverse, one of which is described here as new ( L. rejdalii Upson & Jury). Four of these species are endemic: L. maroccana Murb., L. tenuisecta Coss. ex Ball, L. rejdalii Upson & Jury, and L. mairei Humbert [with two varieties, L. mairei var. mairei and L. mairei var. antiatlantica (Humbert) Maire]. The other two species, Lavandula multifida L. and L. coronopifolia Poir., are native but more widespread species. The distribution of the species in Morocco is shown in grid maps. Lavandula brevidens (Humbert) Maire and its infraspecific taxa are not retained, being reduced to synonymy under L. tenuisecta and L. rejdalii . Full synonymy is given for all taxa and names are lectotypified as necessary.
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Upson et al. (2002) studied this question.
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