Erodium hakangurii Özüdoğru & Özgişi

Özüdoğru, Bariş & Özgişi, Kurtuluş, 2025, Erodium hakangurii (Geraniaceae), a new species from inner Anatolia (Turkey), Phytotaxa 684 (2), pp. 265-274 : 266-271

Erodium hakangurii Özüdoğru & Özgişi sp nov. ( Figures 1, 2A–D , 3–4 )

TYPE: Turkey. Sivas, Altınyayla, Deliilyas, 0.5 km north of Deliilyas Dam, eroded serpentine areas, 1550 m, 39.336950 N, 36.805090 E, 18 June 2023, B. Özüdoğru 6086, K. Özgişi & H. Gür (holotype HUB!, isotypes ANK!, EGE!, GAZI!, HBH!, HUB!, NGBB!, TC!)

Diagnosis: — Erodium hakangurii is morphologically closely related to E. sibtorphianum from sect. Absinthioidea, but differs from it by several morphological characteristics including longer plant high (25–50 vs. 5–18 cm), leaf blade [(2.5–)3–6 × (2–)2.5–3 vs. 0.7–2.5–(3.4) × 1.5(–2) cm], beak of fruit (5.5–6.5 vs. 3–4.5 cm) and number of peduncles in each stem (5–9 vs. 1–2) ( Table 1).

Description: —Erect, caespitose, dioecious perennial plant with several ± lax basal rosettes. Basal leaves bipinnate; greyish to canescent with densely adpressed and sparsely patent hairs. Blade ovate-oblong, (2.5–)3–6 × (2–) 2.5–3 cm with 3–7(–11) cm long petiole; segments 6–7, pinnate, laciniae oblong, 0.9–1.1(–1.3) mm broad, ± involute; rachis lobed between the separate leaflets; cauline leaves few, similar to basal leaves but shorter. Stem 25–50 cm, retrorsely pubescent below, glandular-pubescent above, branching from above or middle, bearing 2–3 sub-branchs and peduncles of each branch 2–3. Peduncles (2.5–) 3–8 cm long, glandular-pubescent. Inflorescences 15–25-flowered, densely covered with glandular hairs. Sepals (4.8–)5.5–6.3 × 1.9–3.1 mm (up to 8 × 4 mm in fruit), ovate to ± oblong, densely glandular, with 4–5 distinct green veins, not reflexed, awn up to 1 mm. Petals violaceus with distinct purple veins, obovate, 7–9.1 × 5–6.7 mm. Beak of fruit 5.5–6.5 cm long and plumose hairy, glandular below. Mericarp 8.5–9 mm, short and long hirsute and short glandular, without furrow beneath. Seed 4.5–5 × 1.3–1.4 mm, oblong, light to dark brown.

Phenology: — Erodium hakangurii has been found flowering in June, and fruiting in June–July.

Eponymy: —This endemic species is named after the Turkish zoologist and biogeographer Prof. Dr. Hakan Gür, one of the holotype collectors.

Distribution and habitat: —This species only grows between 1550–1675 m a.s.l. in serpentine areas around the town of Deliilyas in Sivas Province, Turkey ( Figs. 5–6 ). The species is found in this region on eroded slopes and in a typical steppe community.

Conservation status: — Erodium hakangurii is a local endemic restricted to a part of a serpentine area of Deliilyas District (Altınyayla, Sivas, Turkey) ( Figs. 5–6 ). The area of occupancy (AOO) of the new species was calculated as ca. 2 km ², in which less than 2000 mature individuals were estimated to occur. The new species’ habitat being entirely surrounded by agricultural land indicates that it is at risk of habitat destruction. As a result, the primary threat to this species is the expansion of agricultural activities. Considering this risk and the existence of only one population, the threat category of this species is recommended as CR B1ab(i,ii,iii)+2ab(i,ii,iii) The species is not CR according to criterion C, given that you estimated up to 2000 mature individuals according to the IUCN Red List Criteria ( IUCN 2024).

Micromorphology: —Seed surface analysis using scanning electron microscopy (SEM) revealed details of the epidermal testa cells, as well as the periclinal and anticlinal cell wall boundaries. The seed surface was found to have a scalariform-reticulate pattern, with square to polygonal cells. The anticlinal walls are raised, while the periclinal cell walls are irregularly concave. The pollen grains are tricolporate with triangular ora, and the exine structure is reticulate. Supratectal processes are absent ( Fig. 4 ).

Figures

FIGURE 2. General view of Erodium hakangurii and E. sibthorphianum. A–D. E. hakangurii E–F. E. sibthorpianum A. Habitus B. Basal leaves C. Flowers D. Flowers and fruits E–F. Flowers and leaves (photographs A–D Barış Özüdoğru, E–F Koray Yaylacı)

FIGURE 3. Erodium hakangurii A. Basal leaves B. Female flower C. Male flower D. Hermaphrodite flower E. Mericarp F. Seed

FIGURE 4. Pollen and seed surface of Erodium hakangurii. A. Pollen grain B. Seed surface

FIGURE 5. Habitat of Erodium hakangurii.

FIGURE 6. Distribution map of Erodium hakangurii (red circle), and E. sibthorpianum (blue circles). The highlighted green area shows the Anatolian Diagonal.