Sempervivum
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BORISSOVAE   Wale, 1942

Synonym : Sempervivum caucasicum var. borissovae  (Wale) Gurgenidze (1972)

Section Sempervivum

Distribution : Caucasus; between rocks on a ridge, ± 1850 m, known from the type only.

 

Description (according to 't Hart, Bleij & Zonneveld in IHSP, 2003) :

Rosettes rather open, flat, to 3 cm in diameter.

Stolons short and slender.

Leaves obovate, strongly mucronate, glabrous, subterete, green, reddish-brown in the upper half, ± 22 x 9 mm, ± 3 mm thick.

Flowering branches 7 - 10 cm, cauline leaves glabrous except for the dorsal base, green or reddish-brown.

Flowers 12-to 14- merous, ± 2.5 cm in diameter, sepals reddish, to 8 mm, petals lanceolate, deep rose, with somewhat lighter, slightly irregularly serrated margins, filaments lilac to dark red, anthers red, styles pale pink.

Cytology : 2n = 72

Closely allied to S. caucasicum, but with smaller rosettes and flowering branches. Gurgenidze (1972: 29) treated S. borissovae as a subspecies of S. caucasicum.

 See also Alan C. Smith, The Genus Sempervivum and Jovibarba, 1980




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