Crataegus petrodavisii Dönmez, 2014

Dönmez, Ali A., 2014, Nomenclatural, taxonomic and biogeographic novelties in the Turkish Crataegus L. (Rosaceae-Maleae) taxa, Adansonia (3) 36 (2), pp. 245-253 : 246-247

Crataegus petrodavisii Dönmez , nom. nov.

Crataegus davisii Browicz in Notes from the Royal Botanic Garden Edinburgh 31 (2): 323 (1972); non Crataegus davisii Sarg. in Annual report Missouri Botanical Garden 22: 77 (1911).

— Typus: Turkey. Hakkari, from Yüksekova to Şemdinli , 45 km, 1750 m, 15.V.1966, Davis 45168 (holo-, E! ; iso-, K!, ISTO!).

CHROMOSOME NUMBER. — Unknown.

PHENOLOGY. — Flowering in May to June, mature fruit in September to October.

DISTRIBUTION. — SE Turkey and Iran, probably north Iraq: in hedges, on mountain slopes with deciduous forest, usually of Quercus ; 1500-1800 m.

SPECIMENS EXAMINED. — Turkey. Hakkari, 6 km from Şemdinli to Yüksekova , in Quercus scrub, 37°20’224”N, 044°32’862”E, 1765 m, 2.X.2001, A.A.Dönmez 10318, A.A.Dönmez 10325 ; 2.5 km from Şemdinli to Şapatan Pass , 1520 m, 29.V.2002, A.A.Dönmez 10789, 10793, 10797 with B. Mutlu.

DESCRIPTION

Tree or shrubs up to 7 m tall. Rarely thorny, thorns up to 40 mm long, with short twigs. Young shoots glabrous or villose, rarely sparsely villose, deciduous in fruit. Buds 1.5-2.5 mm long × 1.5-2.5 mm in diameter. Leaves glabrous or sparsely villose, dull or bright green, subcoriaceous, widely cuneate at base, rarely truncate, lobes obtuse, rarely acute, sometimes finely serrate at margin. Middle leaves of flowering shoots 35-55 (-80) × 35-60 (-90) mm, lobes 2-3 pairs, basal lobe at lower half of lamina, sinuses extending more than half the width of lamina, basal pair 0.5-1 times as long as wide, each lobe with 4-8 teeth in the upper half; petioles 20-25 mm; stipules 5-7 × (2-) 3-5 mm, entire or irregularly serrate with 2-5teeth,± uppermost lamina divided into 10-20 × 5-8 mm oblong-lanceolate segments. Middle leaves of short shoots 30-60 × 40- 70 mm, lobes 2-3 pairs, basal sinuses in lower half, sinuses extends to half or more of the lamina,basal pair 1-1.5 times as long as wide, each lobe with 6-10 teeth in the upper 2/3; petiole 18-30 mm, stipules 2-3 × 0.1- 0.2 mm, entire. Middle leaves of long shoots 40-60 (-80) × 40-65 (-80) mm, lobes 2-3 pairs, basal sinuses at lower half of the lamina, extending nearly to midvein, 1.5-2 times as long as wide, 8-12 teeth at upper half; petiole 25-35 mm; stipules 8-12 × 2-7 mm with 5-10 teeth. Inflorescence 25-35 × 35-60 mm, densely corymbose with (10-) 20-35 flowers, villose, sparsely villose in fruit; pedicel 7-12 mm, bracts 3-5 × 0.3- 0.5 mm, deciduous,linear or lanceolate, entire or with 1-4teeth.Flowers 14-17 mm in diameter; hypanthium 3-3.5 × 2-3 mm; sepals 1.5-2 × 1.5-2 mm, oblong or widely triangular, margin entire, obtuse at apex; petals 6-7 × 6-7 mm; stamens 20-26, anthers pink; styles (2-) 3-5, sparsely hairy at base. Fruit 8-12 mm long × 9-13 mm wide, ± globose, dark purple or blackish, pruinose, glabrous; flesh dark reddish,juicy;sepals erect or patent, with a short neck at base; pyrenes (2-)3-5, 4-7 × 3-5 mm, slightly sulcate dorsally.

REMARKS

Differences between Crataegus pentagyna Waldst. & Kit and C. petrodavisii nom. nov. are as follows and are summarized in Table 1 . The leaves of C.petrodavisii nom. nov. are larger than those of C. pentagyna and are glabrous at mature stage. The fruit of C. petrodavisii nom. nov. is bigger than that of C. pentagyna Waldst. & Kit , and it is glabrous. Pyrenes are mostly are 2-4 (-5) for C. petrodavisii nom. nov. whereas they are 4-5 for C. pentagyna . Crataegus petrodavisii nom. nov. occurs mostly in forest areas under dry climatic conditions in Iran and Turkey.However, C.pentagyna occurs in more humid deciduous forest and openings. Crataegus petrodavisii nom. nov. is confined to SE Turkey, the ranges of Zagros Mountain and western Iran, it is an Irano Turanian element. However, native range of C. pentagyna is central and southern Europe, Crimea, Caucasia and northern Iran, and it is an Euro-Siberian element ( Table 1 ). Thus, an evaluation of many collections made by the present author, particularly those with flowers or mature fruits, demonstrate that C. petrodavisii nom. nov. is taxonomically distinct from C. pentagyna .