Vent (1960), Alijanpoor & Khodayari & Assadi & Rahiminejad & Mehregan, 2021

Alijanpoor, Behnaz, Khodayari, Hamed, Assadi, Mostafa, Rahiminejad, Mohammadreza & Mehregan, Iraj, 2021, A taxonomic revision of Rhamnus L. and Atadinus Raf. (Rhamnaceae) in Iran, Phytotaxa 521 (3), pp. 127-158 : 150

2. Atadinus Raf.

Oreoherzogia W.Vent in Feddes (1962: 44) ≡ Rhamnus subg. Oreoherzogia (Vent) Alexeev & Tzvelev in Federov & al. (1996: 396).

Typus: — Atadinus alpinus (L.) Raf. ( Rhamnus alpina Linnaeus 1753: 183 ).

Description —Translated and modified from the description published by W. Vent (1960) in Hauenschild (2016): Shrubs, small (to medium-sized trees), deciduous, tall, not spiny, bisexual or dioecious. [Stems and primary branches with reddish, brownish, greyish or dark to white grey bark, branchlets glabrous to pubescent], rarely with short, leafbearing shoots. Primary branches with phyllopodia opposing a leaf. Buds in leaf-axils, with ciliate scales, glabrous or pubescent, vernation conduplicate. Leaves alternate, 4–30 cm long, glabrous to pubescent; margin leaf crenulate or serrulate, rarely entire; vernation pinnate, with 6–20 pairs of lateral nerves. Petioles 0.2–3 cm. Stipules caducous. Flowers small, solitary or fascicled, in leaf axils, 4(–5)-merous, foral cup hemispheric; sepals triangular, 1–4 mm, glabrous or pubescent, [greenish or yellowish] and sometime persistent in fruit; petals present in bisexual and male flowers, surrounding stamens, sometime opposite to filaments, obcordate to oblong, less than twice as long as wide, distally notched, yellowish to whitish; stamens epipetalous, present in bisexual and male flowers, rudimentary in female flowers, filaments curved inwards, anthers opening laterally-longitudinally. Pollen 15.0–24.0 μm in diameter; pollen exine structure reticulate to striate- microreticulate. Disk thin, surrounding but free from ovary, glabrous. Ovary 2(–3)-locular. Peduncles glabrous or pubescent. Fruit 3–10 mm, drupe, glabrous, subglobose to pyriform, blackish to blackish-blue, with 3–4 seeds. Pulp thin, without secretory capsules. Seeds with dorso-medial furrow, yellowish to brownish, obovate. Embryos with flattened (laterally incurved) cotyledons.