Salix aegaea, Cambria, C. Brullo, Giusso, Sciandr., Siracusa & Brullo, 2020

Cambria, Salvatore, Brullo, Cristian, Galdo, Gianpietro Giusso Del, Sciandrello, Saverio, Siracusa, Giuseppe & Brullo, Salvatore, 2020, Salix aegaea (Salicaceae), a new species from island of Ikaria (Greece), Phytotaxa 447 (2), pp. 127-136 : 135

Key to the species closely related to Salix aegaea

1. Old branchlets pubescent, leaves oblanceolate to oblong-lanceolate, acute at the apex, tomentose abaxially..................................2

- Old branchlets glabrous (rar. slightly pubescent), leaves of different shape, acuminate, apiculate or obtuse at the apex, glabrous or subglabrous abaxially .........................................................................................................................................................................3

2. Leaves oblong to oblanceolate, acute at the apex, pubescent adaxially, toothed at the margin, catkins 40–50 mm long, floral bracts oblanceolate, ovary peduncle 3 mm long, anthers orange, capsule peduncle 3–3.5 mm long, capsule 5 mm long ......... S. anatolica

- Leaves lanceolate to oblong-lanceolate, obtuse to apiculate at the apex, subglabrous adaxially, minutely denticulate at the margin, catkins 15–30 mm long, floral bracts ovate to oblong, ovary 1.2–1.5 mm long, anthers yellow, capsule peduncle 1.5–2 mm long, capsule 8.5–9.7 mm long................................................................................................................................................... S. kaptarae

3. Leaves oblanceolate, acute at the apex, smooth-undulate at the margin (sometimes obscurely denticulate), female catkins 21–27 mm long, floral bracts obovate-spathulate, undulate at the margin, staminal filaments 7–7.5 mm long............................. S. aegaea

- Leaves never oblanceolate, obtuse to acuminate at the apex, toothed at the margin, female catkins 25–70 mm long, floral bracts never obovate-spathulate, not undulate at the margin, staminal filaments 3.2–6 mm long ...............................................................4

4. Leaves ovate to oblong-lanceolate, (60) 80–120 mm long, (32)35–50(80) mm wide, leaf petiole 4–7 mm long, floral bract acute, one and a half time longer than ovary peduncle, style hairy ........................................................................................... S. tyrrhenica

- Leaves lanceolate, elliptical or obovate, 25–80(100) mm long, 10–35(45) mm wide, leaf petiole 5–20 mm long, floral bract rounded or obtuse, twice to three time longer than ovary peduncle, style glabrous ......................................................................…5

5. Old branchlets without wood ridges, leaf blade 11–17-nerved, stipules 3–3.5 mm long, 1.5–2 mm wide, densely toothed, floral bracts oblanceolate, almost all blackish, 2–2.8 mm long, rounded at the apex, ovary 1,8–1,9 mm long, style connate, stamen filament 3.2–4.5 mm long, capsule 6 mm long ............................................................................................................ S. nebrodensis

- Old branchlets with wood ridges 6–30 mm long, leaf blade 7–10-nerved, stipules 6–10 mm long, 3.7–5 mm wide, loosely toothed, floral bracts oblong-ovate, blackish only at the apex, 1–2 mm long, obtuse at the apex, ovary 2.5 mm long, style bifid, stamen filament 5–6 mm long, capsule 6.5–8 mm long ................................................................................................................ S. apennina