Micromeria imbricata
Observed on the rim of Menangai Crater, Kenya, Africa. March 2013.
LEAVES: The opposite leaves are elyptical with conspicuous acuminate
tips, slightly thickened, stiff. The margins are thickened/rolled over.
SUBSHRUB: Lower stems slightly woody and giving rise to several tall,
unbranched stems above. Aromatic when crushed. 
FLOWERS: Small, pale purple flowers with slight bilateral symmetry.
RANGE: Agnew reports in common in upland dry grasslands in Kenya.
FRUIT: capsules.
UNARMED However, the leaves and bracts subtending the flowers are stiff
and pointed.
More Information:
- Book: Upland Kenya Wild Flowers and Ferns by A. D. Q. Agnew, 3rd Revised Edition, 2013, Nature Kenya - The East Africa Natural History Society
- Flora of Zimbabwe
- Wikipedia
- Encyclopedia of Life
- Google Images
- Google Scholar Literature Search