Paeonia kesrouanensis(1)

Perennials. Roots carrot—shaped. Stems 35—80 em tall, glabrous, green, sometimes with purple spots or partially purple at the base, with 4-7 yellow—green scales at the base. Petioles and petiolules glabrous. Lower leaves biternate; leaflets/leaf segments 10—14, rarely up to 17 in number, ovate or elliptic, acute at the apex, 8—l8 cm long, 4—7.5 cm wide, glabrous above, sparsely to rather densely villose beneath. Flowers solitary; involucrate bracts mostly one, rarely 2 in number, leaf-like, or absent; sepals 3-4, less frequently 2 or 5 in number, nearly orbicular, mostly or all rounded but sometimes one acute at the apex, green but often purple at the periphery, usually glabrous, rarely sparsely hirsute outside; petals 5—9 in number, pale pink, pink or red, 4.5-6.3 cm long, 2.5-4.2 cm wide, mostly entire, rarely incised; filaments dark purple; anthers yellow; disk 1 mm high, entire, rarely waved; carpels 1—3, rarely 4 or 5 in number, glabrous; styles 1.5—3.5 mm long, styles and straight part of stigmas together 3.5-7.0 mm long.

Chromosome number: 2n = 20 (tetraploid)

Growing in Fagus orientalis, Pinus nigra or Cedrus libani forests or in Quercus scrubs in areas of limestones or metamorphic rocks at altitudes from 1,000 to 1,800 m. Confined to Lebanon, SW Syria, and SW and S Turkey

Paeonia kesrouanensis is a distinct species. It grows together with P. daurica in Mt Amanos in S Turkey, but we found no hybrids there. It differs from P. daurica not only in morphology (lower leaves with 10-17 leaflets/leaf segments; carpels 1-3, always glabrous in P. kesrouanensis) but also in ploidy (2n = 20 for P. kesrouanensis versus 2n = 10 for P. daurica). Paeonia kesrouanensis also grows together with P. mascula on Ziyaret Hill, above Senkoy, Antakya, Turkey, where we did not find hybrids. The population of P. mascula there, like the populations elsewhere, had carpels that were 3-5 in number and lanate, and sessile stigmas, and was thus distinct from P. kesrouanensis. Paeonia kesrouanensis is similar to two other allopatric species, P. coriacea (S Spain and Morocco)‘and P. cambessedesii (the Baleares, Spain). However, P. coriacea is nearly always glabrous throughout, and P. cambessedessi is always glabrous throughout, with its lower leaves nearly always of 9 entire leaflets and mostly (3—)4—6(—8) carpels.
Paeonia turcica was described as new by Davis and Cullen due to its having styles and stigma that are shorter than those in P. kesrouanensis and curved near the base (rather than curved only at the apex in P. kesrouanensis). The length of style and stigma in P. turcica is, however, in the variation range of those in P. kesrouanensis (4.5—7 mm) and they curve at various positions. Therefore, P. turcica was treated as a synonym of P. kesrouanensis.

Footnotes:
  1. Hong, De-Yuan. “Peonies of the World. Taxonomy and phytogeography.” Kew: Royal Botanic Gardens, 2010, p. 195-196.[]

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