Two new taxa of Hypericum (Hypericaceae) from Turkey
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ISSN: 0075-5974 (print) ISSN: 1874-933X (electronic)
Two new taxa of Hypericum (Hypericaceae) from Turkey Tuncay Dirmenci1
& Norman K. B. Robson2
Summary. Two new taxa of Hypericum are described from Turkey — H. cuisinii Barbey subsp. anatolicum Dirmenci & N.Robson from Aydin province and H. kemaliyensis Dirmenci & N.Robson from Erzincan province, and their relationships are discussed. Key Words. Adenosepalum, Clusiaceae, Taeniocarpium, taxonomy.
Introduction Hypericum L., with 86 species, is an important genus in the flora of Turkey. It is not surprising, therefore, that new taxa continue to be described from there. In this paper we describe two new taxa, one in sect. Adenosepalum N.Robson so closely related to a species of the Aegean region that we have ranked it as a subspecies (Hypericum cuisinii Barbey subsp. anatolicum Dirmenci & N.Robson), the other (H. kemaliyensis Dirmenci & N.Robson) in eastern Turkey belonging to a closely related group of species in sect. Taeniocarpium Jaub. & Spach.
Materials and Methods Specimens of Hypericum cuisini subsp. anatolicum were collected from Dilek Peninsula National Park in Kuşadası district, Aydın province which is located west of Anatolia, in 2015 – 2016 (Map 1). Hypericum kemaliyensis specimens were collected from Kemaliye district, Erzincan in eastern Turkey in 2016 (Map 1) and were identified using the relevant literature (Robson 1967; Robson & Strid 1986; Robson 1988, 1996; Yıldırımlı 1995; Dönmez 2000) and compared with material found in the following herbaria: ANK, BM, HUB, INONU, K, NGBB, W, and WU and with our own specimens at Balıkesir University herbarium (Appendix 1). Taxonomic comments on Hypericum cuisinii and its new subspecies Hypericum cuisinii is mainly distributed in the Greek Aegean islands Khios, Ikaria, Karpathos and Kasos and another a small population has now been found in İzmir (Bozdağ) Turkey. It is closely related to H. atomarium Boiss., which is mainly distributed in west Anatolia and the East Aegean islands. According to Robson (1996),
H. cuisinii is clearly a derivative of H. atomarium, but it can be distinguished from it in having shorter sepals with shorter marginal glandular ciliae, leaves sometimes petiolate, 2 – 15 (– 23) mm long (not sessile, 15 – 55 mm long) and stems decumbent to diffuse-ascending and rooting (not erect to decumbent but not rooting). It forms a reduction series from extreme western Turkey (Izmir) via Khios, Ikaria and Karpathos to Kasos (Robson 1996). The new population is from mainland Turkey. During field trips in 2015 in the Kuşadası district (which is located in extreme western Turkey very close to the East Aegean islands), some unusual Hypericum specimens were collected. After detailed investigations, we decided that they should be regarded as a new subspecies of H. cuisinii that continues the reduction series in that species. Hypericum cuisinii Barbey subsp. anatolicum Dirmenci & N.Robson subsp. nov. (sect. Adenosepalum N.Robson). Type: Turkey, Aydın: Kuşadası, Dilek Peninsula National Park, rocky slopes, 11
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