A taxonomic revision of Rhamnus L. and Atadinus Raf. (Rhamnaceae) in Iran Author Alijanpoor, Behnaz 0000-0002-9698-2592 Department of Biology, Faculty of Science, Lorestan University, 5 Km Khorramabad toward Tehran, P. O. Box 6815144316 - 465 Khorramabad, Iran. & alijanpour. be @ fs. lu. ac. ir; https: // orcid. org / 0000 - 0002 - 9698 - 2592 alijanpour.be@fs.lu.ac.ir Author Khodayari, Hamed 0000-0003-0614-2600 Department of Biology, Faculty of Science, Lorestan University, 5 Km Khorramabad toward Tehran, P. O. Box 6815144316 - 465 Khorramabad, Iran. & khodayari. h @ lu. ac. ir; https: // orcid. org / 0000 - 0003 - 0614 - 2600 khodayari.h@lu.ac.ir Author Assadi, Mostafa 0000-0001-9014-585X Department of Botany, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), P. O. Box 13185 - 116, Tehran, Iran. & assadi @ rifr-ac. ir; https: // orcid. org / 0000 - 0001 - 9014 - 585 X assadi@rifr-ac.ir Author Rahiminejad, Mohammadreza 0000-0003-2459-482X Department of Biology, University of Isfahan, 81746 - 73441, Isfahan, Iran. & mrr @ sci. ui. ac. ir; https: // orcid. org / 0000 - 0003 - 2459 - 482 X mrr@sci.ui.ac.ir Author Mehregan, Iraj 0000-0002-5108-2558 Department of Biology, Science and Research branch, Islamic Azad University, Tehran, Iran. & iraj @ daad-alumni. de; https: // orcid. org / 0000 - 0002 - 5108 - 2558 iraj@daad-alumni.de text Phytotaxa 2021 2021-09-30 521 3 127 158 http://dx.doi.org/10.11646/phytotaxa.521.3.1 journal article 10.11646/phytotaxa.521.3.1 1179-3163 5540457 4. Rhamnus rahiminejadii Alijanpoor & Assadi , sp. nov . ( Fig. 3 ) Holotype — IRAN . Mazandaran : From Ramsar towards Chalus , Jannatroudbar , ca. 500 m from Jannatroudbar towards Palhamjan village , 1530–1560 m , 11 May 2017 , B . Alijanpoor s. n. ( TARI 103846 !; Isotype W 0004516 !). Description —Shrubs, 30–100 m high, erect or prostrate, spiny. Spines 3–5 mm long, simple or branched. Bark grey, dark brown. Brnches opposite, young branches densely hairy. Leaves petiolate; blade 10–25 × 10–15 mm , broadly ovate or elliptic, with glandular teeth at the margin, 3(–4) paires lateral nerves curved and alternate, bicolor, densely hairy below, less above, glabrescent in age; with abtus at the apex and base; petioles 3-8 mm long, densly hairy; stipules 1–3 mm long, filiform. Inflorescence of 1–4 flowers, unisexual, ca. 3 mm long, 4-merous; peduncle glabrus, 2–4 mm long; calyx ca. 1 mm long; sepals ca. 2 mm long, narrow triangular, acute; petals narrow, half as long as sepals; stamens strile in female flowers, as long as petals; ovary with (2–)3(–4) styles. Fruits drupe, ca. 5–8 mm long, globulor, 2–4 furrows at the apex, black in old age. Seeds 2–4, triangular, brown, 3 × 4 mm . Note — R. rahiminejadii is close to Rhamnus minuta Grubov. The two species are compared in Table 2 : Habitat and distribution— Endemic to N IRAN . The species is an Euro-Siberian element that is known only from the type specimen collected from Jannatroudbar Region . It occurs in N Iran at an altitude of 1530–1560 m , between 50°30ʹ40ʺ E and 36°46ʹ38ʺ N . The species occurs on the N slopes aspect, on the soil and runner on the rocks in forests margines . Phenology —Flowering is in late May to early June, fruits and seeds maturie in second half of July to late August. Conservation status — R. rahiminejadii is given the assessment of Data Deficient (DD) according to the IUCN (2001) criteria. Note —This species has two types of habits: standing on the soil and runner on the rocks in forests margine. Etymology —The specific epithet is given in honour of Dr. Mohammad Reza Rahiminejad an Iranian Botanist.