Rosa × ozcelikii Korkmaz & Kandemir

Korkmaz, Mustafa, Kandemir, Ali & Doğan, Nalan Yildirim, 2016, A new natural hybrid of Rosa (Rosaceae) from Turkey, Phytotaxa 245 (3), pp. 207-215 : 210-212

Rosa × ozcelikii Korkmaz & Kandemir hybr. nov.

[ R. villosa L. subsp. mollis (Sm.) Hook.f. × R. hemisphaerica Herrm. ] ( Fig. 1 )

New hybrid produced after crossing of R. hemisphaerica and R. villosa . subsp. mollis . It differs from R. hemisphaerica by the colour of its petals, with upper half reddish pink and lower half yellowish (not entirely yellow); hypanthium ovoid (not globose); leaflets elliptic to ovate, hairy on both sides, rounded, sometimes broadly cuneate (not obovate, glaucescent and cuneate at base). It also differs from R. villosa . subsp. mollis by the bicoloured petals (not mostly deep pink); hypanthia ovoid and orange in fruiting time (not globose and red); leaflets elliptic to ovate (not ovate to suborbicular); stems with long and small prickles (not only long prickles).

Type:― TURKEY. East Anatolia, B 7 Erzincan: Çayırlı District, between Verimli and Balıklı villages, about 15 km to Çayırlı district, field side, 1641 m, 39° 52 ’ 418’’ N, 39° 55 ’ 644’’ E, 2 June 2014, Korkmaz 4081 (holotype: ANK!, isotypes: GAZI!, NGBB!, GUL!).

Dense shrub up to 3 m tall. Stems erect; young stems brown-red with both prickles and bristles, glandular hairy, grey in old stems. Prickles sparsely, curved with broad base, tapering from base, 4–7 mm, straw to whitish, deciduous in older stems; bristles erect to slightly curved, deciduous in older stems; glandular hairs on young stems usually stalked, sometimes sessile. Young shoots green with prickles, bristles and glandular hairs. Leaves alternate, compound with 5–7 leaflets, auriculate at base; main axis 1–3.5 cm long with glandular and long hairs; leaflets elliptic to ovate, rarely obovate, increasing in size upwards, 8–30 × 3–15 mm, base rounded, sometimes broadly cuneate, margin glandular, serrate in 2/3 of upper part, entire in lower parts, abaxially pale green with sparse hairs, adaxially darker green with densely pubescent; auricles glandular especially on margins, ± glabrous above except medial vein, abaxially hairy. Inflorescence with 1–3 flowers, bracteate. Pedicels glandular, sparse hairy to subglabrous, 5–12 mm, longer than hypantium, more or less elongating in fruiting time. Hypanthium ovoid, 4–5 × 2–3 mm, constricted above, green in flowering, eglandular or glandular or subglabrous, orange and glabrescent after anthesis. Sepals 5, green, 10–14 mm in flower, clearly longer than hypanthium, lanceolate, apex acuminate, straight, sometimes slightly falcate, symmetric, sometimes asymmetric in shape, lanate inside, hairy and glandular outside, deflexed; outer sepals with 1–2 lateral lobes, rarely entire; inner sepals entire, sometimes lobate. Petals 5, obovate, 2.1–3 × 1.5–2 mm, apex retuse; upper half parts reddish pink, lower half parts yellow. Filaments 2–4 mm, glabrous; anthers ca. 1 mm. Styles up to 1 mm, lanate; stigma capitate. Achenes ca. 2 mm long, with long hairs on one side of the upper part.

Additional specimens examined: ― TURKEY. Erzincan: Çayırlı, between Verimli and Çayırlı, about 1 km from Verimli village road, field and stream side, 1641 m, 17 August 2014, Korkmaz 4179!, 15 September 2015, Korkmaz 4253! (topotypes).

Distribution and ecology:— Rosa × ozcelikii is known to occur in only one locality near Çayırlı district of Erzincan province, in Eastern Anatolia region of Turkey ( Fig. 2). The elevation of the habitat is 1641 m. Some plants found close to the new species are Lactuca serriola L., Triticum durum Desf. , Rumex acetosella L., Salix fragilis L., Dipsacus laciniatus L., Phragmites australis (Cav.) Trin. ex Steud. , Sinapis arvensis L, Sisymbrium loeselii L., Mentha longifolia (L.) Huds. subsp. longifolia , Isatis glauca Aucher ex Boiss. subsp. glauca , Myosotis arvensis (L.) Hill, Papaver dubium L. subsp. dubium , Descurainia sophia (L.) Webb ex Prantl, Euphorbia virgata Waldst. & Kit. , Alopecurus myosuroides Huds. , and Cirsium echinus (M.Bieb.) Sch.Bip.

According to the results of soil analysis where new nothospecies grow, saturation value was 66.00, soil pH was 7. 97, electrical conductivity was 0.64, and organic matter concentration was 1.60%; lime (CaCO 3) concentration was 11.59 %, salt concentration was 0.027 %, phosphorus content was 2.29 kg /da, and potassium content was 38.60 kg /da. Therefore, those soils can be characterized by a heavy texture in clayish-loam class, slightly alkaline, medium amount of organic matter, medium amount of lime, low amount of salt, high phosphorus content, and enough potassium content.

Eponymy: —The specific epithet honours Prof. Dr. Hasan Özçelik, who is a Turkish botanist and expert on Turkish taxa of Rosa .

Vernacular name: ―“Sarıkırmızı Gül” (Turkish).

Phenology:— Flowering from May to June, fruiting in August.

Conservation status: —The new hybrid species is known from only one locality (criterion B2a) in which about 200 individuals were observed. Because of that reason threat category of the species should be CR (Critically Endangered) ( IUCN 2014). The population was observed to be healthy and buoyant in 2014 field survey, but it had decreased in 2015 because of agricultural activities. In addition, many individuals were affected by a mycosis with orange colour.

Figures

FIGURE 1. Rosa × ozcelikii Korkmaz & Kandemir. A. flowers; B. fruiting stems; C. habit in habitat.