Ruta

Marrero-Rodríguez, Águedo, Vidal-Matutano, Paloma, Delgado-Darias, Teresa, Jaén-Molina, Ruth, Morales-Mateos, Jacob, Alberto-Barroso, Verónica & Velasco-Vázquez, Javier, 2023, Can material of a putatively extinct new species of Ruta (Rutaceae), preserved with mummies, provide new knowledge about evolution in the Canary Islands flora?, Willdenowia 53 (1), pp. 5-23 : 11

Identification key to the Canarian species of Ruta

1. Leaves 2- or 3-pinnatisect................... 2

– Leaves 1-pinnatisect........................ 3

2. Petals entire; infructescence branches lax, non-spiciform; fruit 3.5–9(–11.5) mm long (Mediterranean; cultivated and subspontaneous in Canary Islands)................................... R. graveolens

– Petals laciniate; infructescence branches spiciform; fruit 3.5–6.9(–7.9) mm long (Mediterranean; cultivated and subspontaneous in Canary Islands, probably native to Lanzarote)......... R. chalepensis

3. Fruits dehiscent........................... 4

– Fruits indehiscent.......................... 5

4. Plant stumpy, twisted, with decumbent branches; pinnae broadly spatulate, obovate or oblong (Gran Canaria).......................... R. oreojasme

– Plant taller, with erect or ascending branches; pinnae linear-filiform (Gran Canaria, putatively extinct)........................... R. museocanariensis

5. Plant lax, slender, 1.5–2(–3) m tall; pinnae broadly spatulate, oblong or broadly oblanceolate (La Palma, La Gomera, Tenerife)............... R. pinnata

– Plant ± dense, 40–100 cm tall; pinnae ± narrow, mostly oblanceolate............................ 6

6. Plant 80–100 cm tall; pinnae narrowly spatulate, oblong, oblanceolate or rhombic; fruit 4–5 mm long (La Gomera)...................... R. microcarpa

– Plant 40–60 cm tall; pinnae very narrowly oblanceolate; fruit 2.5–3 mm long (La Gomera)........................................ R. nanocarpa