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There are just 2-4 species. R. officinalis (rosemary), widespread in the Mediterranean region, and R. eriocalyx, native to northwest Africa and southern Spain have long been widely recognized. Rosmarinus tomentosus was first recognized as a separate species in 1941. Rosmarinus palaui was first described as a species in 2002, although recognition of this species remains controversial. Recent research has indicated that while R. tomentosus froms a monophyletic group, this group is nested within a paraphyletic R. eriocalyx.
Rosmarinus eriocalyx differs from the well-known herb rosemary in its smaller leaves, only 5–15 mm long and less than 2 mm broad, and densely hairy flower stems. It also tends to be lower-growing, often under 25 cm tall and prostrate, and never exceeding 1 m tall (R. officinalis can reach 1.5 m, exceptionally 2 m, tall).
- Rosmarinus eriocalyx Jord. & Fourr.
- Rosmarinus officinalis L. – Rosemary
- Rosmarinus palaui (O.Bolòs & Molin.) Rivas Mart. & M.J.Costa
- Rosmarinus tomentosus Hub.-Mor. & Maire
- "Genus: Rosmarinus L.". Germplasm Resources Information Network. United States Department of Agriculture. 2004-09-10. Retrieved 2010-11-04.
- Sunset Western Garden Book, 1995:606–607
- Rossello, J.A.; et al. (2006). "Intragenomic diversity and phylogenetic systematics of wild rosemaries (Rosmarinus officinalis L. s.l., Lamiaceae) assessed by nuclear ribosomal DNA sequences (ITS)". Plant Systematics and Evolution 262 (1-2): 1–12. doi:10.1007/s00606-006-0454-5. Retrieved November 11, 2012.
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