Silene, L.

Jafari, Farzaneh, Keshavarzi, Maryam, Doostmohammadi, Moslem & Mirtadzadini, Mansour, 2023, Two new chasmophytic species of Silene (Caryophyllaceae, sect. Siphonomorpha) from Iran, European Journal of Taxonomy 860, pp. 42-61 : 47

Key to S. penduliflora F.Jafari, Keshavarzi & Doostm. sp. nov., S. thyrsiantha F.Jafari, Mirtadz. & Keshavarzi sp. nov. and close relatives

1. Stems non-viscid; synflorescences densely thyrsoid, pedicel <4 mm; calyx <8 mm ........................ ....................................................................................................... S. parrowiana Boiss. & Hausskn.

– Stems viscid; synflorescences laxly thyrsoid, pedicel> 4 mm; calyx usually> 8 mm ...................... 2

2. Calyx 7‒11 mm; pedicel 5‒9 mm; capsule 6.5‒9× 2.5‒5.5 mm ....................................................... 3

– Calyx 8‒10 mm; pedicel (4.5‒) 5‒16 mm; capsule 4‒6 × 3‒4 mm .................................................... 4

3. Basal leaves 5‒32 × 2‒4.5 mm; calyx 7‒9 mm; petal limb 2‒3 mm; capsule 6.5‒7 × 2.5‒3 mm ........ ............................................................................................ S. ghahremaninejadii Hoseini & Assadi

– Basal leaves 11‒60× 2.5‒4 mm; calyx 9‒11 mm; petal limb 5‒6 mm; capsule 7.5‒9× 4‒5.5 mm .... .................................................................... S. penduliflora F.Jafari, Keshavarzi & Doostm. sp. nov.

4. Stem non-thick; pedicel (4.5‒) 5‒16 mm; petal limb ca 5 mm; claw glabrous; seeds 0.8 × 0.6–0.7 mm; seed testa cell margins V-shaped; distribution: Isfahan Province ........................................................ ..................................................................... S. thyrsiantha F.Jafari, Mirtadz. & Keshavarzi sp. nov.

– Stem thick; pedicel 6‒12 mm; petal limb 5‒5.5 mm; claw ciliate; seeds 1.1 × 0.8 mm; seed testa cell margins U-shaped; distribution: Semnan Province ....................................... S. shahrudensis Rech.f.