Abstract
Hedysarum nallihanse, a new species in the Hedysareae DC. (Fabaceae) tribe, was described and illustrated from Beypazarı-Nallıhan (Ankara Province) in Turkey. It belongs to the Obscura B. Fedtsch section. The characteristic structure has greenish stems, persisting corolla during fruiting time, mostly 2–3 unarmed, segments with short adpressed hairy fruit. The new species is closely related to H. vanense Hedge & Huber-Morath (1969:36) , but it is distinguished from it by a white corolla and the appearance of a purplish point at the tip and the larger stipule. Also, it is closely related to H. hedysaroides (L.) Schinz & Thellung (1913:70) since the standard is shorter than the keel and the fruit is without thorns. However, it is distinguished by its structure with a shorter stipule in this new species, the white color of the corolla, the segmented lomentum is 2–3 (not 3–5) and the leaflets 3–5 (–6) pairs (not 6–10 pairs). This new species is one of the two species in the genus that have a white corolla. Taxonomic descriptions, other morphological characters, phenology, and the IUCN category of the new species were presented. In addition, the geographical distribution of H. nallihanse, H. vanense and H. hedysaroides was mapped.
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