Alkanna, Tausch, 1824

Khalvati, Sina & Ranjbar, Massoud, 2021, The comparative study of Alkanna and Huynhia (Boraginaceae, Lithospermeae), with description of a new species in Iran, Phytotaxa 524 (4), pp. 216-234 : 231-232

Updated key to the species of Alkanna

and Huynhia ( Iran)

1. Corolla lobe unequal............................................................................................................................................................ Huynhia 2

- Corolla lobe equal................................................................................................................................................................ Alkanna 3

2. Corolla yellow with purple spots, long tubular; 18–20 mm long, stigma slender; deeply bilobed.................................... H. pulchra

- Corolla purple or blue to violet light, short tubular; 10–14 mm long, stigma inflated; shallowly bilobed...................... H. purpurea

3. Leaves with sinuate-crispate margin, loosely white hispid .......................................................................................... A. leptophylla

- Leaves flat margin, densely white hispid ..........................................................................................................................................4

4. Corolla pubescent or puberulent outside ....................................................................................................................... A. trichophila

- Corolla glabrous outside.....................................................................................................................................................................5

5. Nutlet’s beak slightly deflexed ......................................................................................................................................... A. orientalis

- Nutlet’s beak strongly deflexed .........................................................................................................................................................6 6. Bracts broadly ovate, 1–3 cm long; corolla up to 10 mm long ....................................................................................... A. bracteosa

- Bracts lanceolate or oblong to ovate, up to 2 cm long; corolla up to 15 mm long ............................................................................7

7. Corolla sulphur yellow with purple spots; tube short, (6–) 8 mm long................................................................................. A. frigida

- Corolla blue (or purple); tube long, (8–) 12 mm long.................................................................................................... A. semiromica