Micromeria microphylla (d'Urville, 1822) Bentham, 1834

Bogdanović, Sandro, Ljubičić, Ivica, Sáez, Llorenç & Brullo, Salvatore, 2024, Micromeria silicii, a new species from Croatia and its relationships with taxa of the M. microphylla group (Lamiaceae), Phytotaxa 662 (1), pp. 1-18 : 15

Key to the species belonging to the Micromeria microphylla group

1. Stem always erect, corolla 3 mm long................................................................................................................................................2

- Stem procumbent to ascending (rarely erect), corolla 3.5–6.5 mm long ...........................................................................................3

2. Leaves densely hairy, with hairs appressed to patent, 0.2–0.5 mm long, calyx 2.4–2.5 mm long, covered by hairs 0.5–1 mm long, with teeth subequal, 0.6–0.8 mm long........................................................................................................................ M. acropolitana

- Leaves scabrid, with hairs up to 0.1 mm long, calyx 3–3.5 mm long, covered by hairs 0.1–0.2 mm long, bilabiate with upper teeth 0.8–0.9 mm long and lower teeth 1.2–1.5 mm long......................................................................................................... M. carpatha

3. Stem with hairs always retrorse, calyx with teeth subequal.......................................................................................... M. rodriguezii

- Stem with hairs patent or sometimes retrorse, calyx bilabiate ...........................................................................................................4

4. Calyx 4.5–5 mm long, with upper teeth 1.2–1.5 mm long and lower teeth 1.6–2.2 mm long............................................ M. hispida

- Calyx 2.5–4 mm long, with upper teeth 0.6–1.1 mm long and lower teeth 0.9–1.5 mm long...........................................................5

5. Stem with hairs always patent, leaves subequal along the stem (ovate to lanceolate), verticillaster up to 5–7 flowers....................6

- Stem with hairs mixed (patent to reflexed or curved), leaves dimorphic, basal ones ovate to cordate, upper ones lanceolate to linear-lanceolate, vericillaster with max. 3 flowers ......................................................................................................................................7

6. Leaves up to 5 mm wide, with appressed hairs, calyx 3–4 mm long................................................................................... M. cypria

- Leaves max. 2.5 mm wide, with patent hairs, calyx 2.5–3(–3.5) mm long.................................................................. M. sphaciotica

7. Stem with hairs 0.3–0.8 mm long, calyx 2.5–3.2 mm long, with upper teeth 0.8–1.1 mm long, corolla 4.5–6 mm long, with tube long exserted from the calyx, stamens exserted from corolla tube, mericarps 0.6–0.8 × 0.3–0.4 mm ....................... M. microphylla

- Stem with hairs 0.1–0.3 mm long, calyx 3–3.7 mm long, with upper teeth 0.6–0.8 mm long, corolla 3.5–4 mm long, with tube included in the calyx, stamens included in the corolla tube, mericarps 0.8–1 × 0.4–0.5 mm ............................................... M. silicii