Senecio perralderianus Cosson (1862: 173)

Calvo, Joel, Álvarez, Inés & Aedo, Carlos, 2015, Systematics of Senecio section Crociseris (Compositae, Senecioneae), Phytotaxa 211 (1), pp. 448-450 : 448-450

Phytotaxa 211 (1) © 2015 Magnolia Press • 75 23. Senecio perralderianus Cosson (1862: 173) , replacement name. Replaced name: Senecio atlanticus Cosson (1856: 706) , nom. illeg. ( McNeill et al. 2012, ICN Art. 53.1), non Boissier & Reuter (1852: 58). TYPE: Algeria, Tizi Ouzou, montagnes da Djurdjura près des pics de Tizi Tsennent and Tamegout, [36º28'N 04º06'E], 25 June–3 July 1854, Cosson s.n. (lectotype, designated here, P-2685387 image!; isolectotype, P-2685382 image!). Epitype (designated here): Algeria, Tizi Ouzou, montagnes da Djurdjura près de Bordj Boghni, [36º28'N 04º00'E], 23 June 1854, E. Cosson s.n. (G-308021!).

Senecio perralderianus var. hosmariensis Pau & Font Quer in Font Quer (1929: n.º 405). Senecio perralderianus subsp. hosmariensis (Pau & Font Quer) Blanca (1996: 309) [“hosmariense”]. TYPE: Morocco, Tetuán, montis Kelti (Yebala), [35º21'N 5º16'E], 18 June 1928, P. Font i Quer 405 (lectotype, designated here, MA-130562!; isolectotypes, BC-29442 image!, G-308028!, MPU-6599 image!).

Senecio auricularis Pau , nom. nud., in sched. ( McNeill et al. 2012, ICN Art. 38.1) (MA-130560!).

Perennial herb. Rhizome 5–10 cm long, 0.5–1.1 cm in diam., ± horizontal, with swelled fastigiate roots. Stem 29–54 cm, erect, leaved, corrugated, solid, not ramificated, glabrescent to floccose, base without remnants of old leaves or tufts of hairs. Basal leaves 4.5–12.5 cm long, 5.3–10.3 cm wide, persistent, rarely withering early, reniform (ratio basal leaf width / basal leaf length = 0.82–1.22), obtuse, cordate, with a petiole 5.5–15 cm long, dentate to crenate (teeth 1–5.5 mm deep), glabrescent above, covered with scattered scabrid-arachnoid trichomes to slightly lanate beneath, sometimes ± discolorous. Cauline leaves 4–5; middle cauline leaves 3.1–20 cm long, 3.1–12.7 cm wide, alternate, lyrate to ovate (ratio middle leaf width / middle leaf length = 0.47–1.23), obtuse, amplexicaul-auriculate to cordate-truncate with a petiole up to 7 cm long, dentate to crenate (teeth 1.3–6 mm deep), glabrescent above, covered with scattered scabrid-arachnoid trichomes to slightly lanate beneath, tertiary venation sometimes slightly marked; upper cauline leaves 1.8–7.5 cm long, 0.3–4.5 cm wide, ovate to lyrate (ratio upper leaf width / upper leaf length = 0.16–0.71), acute to obtuse, amplexicaul to sessile, entire to dentate (teeth 1–2 mm deep), glabrescent to arachnoid. Synflorescence 7.5–13.5 cm long, reduced to a solitary capitulum or corymbose, with scarce linear-oblong bracts. Capitula 1–3(–8), 35–47 mm in diam.; involucre 11.8–22 mm in diam., 9.1–13 mm long, bell-shaped; involucral bracts (16–)21–24(–32), 8.2–11.3 mm long, 1.4–2.3 mm wide, with scarious margin 0.3–0.5 mm wide, lanceolate to oblong, attenuate, 0–2-keeled, apex sometimes with a faint black spot, glabrescent to covered with scattered arachnoid trichomes (trichomes 0.3–0.4 mm long); supplementary bracts 10–14(–16), 4.3–7.8 mm long, 0.4–1.3 mm wide, subulate, without scarious margin, a third to two thirds as long as involucral bracts, weakly arachnoid to floccose, rarely glabrescent, not imbricated. Ligulate florets 12–15, 23–27 mm long, yellow; tubular florets 6.5–9.6 mm long, 0.8–1.5 mm in diam., yellow. Achenes 3.3–5.6 mm long, 0.7–0.9 mm wide, subcylindrical (ratio achene width / achene length = 0.15–0.24), shorter than pappus, with 9–11 ribs, with scattered intercostal trichomes ca. 0.1 mm long; pappus ca. 7.8 mm long, whitish. Chromosome number: unknown. Figure 30 .

Distribution and habitat: — Algeria, Morocco; woods of Cedrus atlantica (Endlicher) Manetti ex Carrière (1855: 285) , Quercus ilex , shady rocky places, on calcareous soils; elevations of 700–2100 m ( Figure 17 ).

Phenology: — Flowering from April to May.

Etymology: — Senecio perralderianus is named in honor of Henri René Le Tourneux de la Perraudière (1831–1861), French naturalist who travelled with Cosson through North Africa and, in 1855, with Bourgeau in the Canaries. Curiously, Cosson changed the root of the epithet perrauder- for perralder-. It might be a typographic mistake.

Discussion: — Senecio perralderianus is a distinctive plant among the Crociseris species because of its reniform basal leaves, glabrescent above, covered with scattered scabrid-arachnoid trichomes to slightly lanate beneath, sometimes ± discolorous. The density of the indumentum beneath and the capitula number are variable. Font i Quer described the subsp. hosmariensis from northwestern Rif on the basis of its less pubescent indumentum, larger leaves and auricles, and longer than wide leaf lamina. All these characters have also been observed in specimens from Algeria, considering therefore that they fall in the variability encompassed by S. perralderianus .

76 • Phytotaxa 211 (1) © 2015 Magnolia Press

CALVO ET AL.

SYSTEMATICS OF SENECIO SECTION CROCISERIS

Phytotaxa 211 (1) © 2015 Magnolia Press • 77

This species might be confused with S. olgae and S. trapezuntinus because of the cordate basal leaves, and the often lyrate, amplexicaul-auriculate cauline leaves. Nonetheless, their ranges of distribution do not overlap and several characters differentiate them. It differs from S. olgae mainly in the number of supplementary bracts (10–14(–16) in S. perralderianus vs. (3–)4–6(–8) in S. olgae ), and from S. trapezuntinus in the lower capitula number (1–3(–8) vs. 10–17), and the indumentum beneath the leaves (scabrid-arachnoid to slightly lanate in S. perralderianus , almost glabrous in S. trapezuntinus ).

Senecio perralderianus overlaps its range with S. eriopus in the northwestern Rif ( Morocco), but it is unlikely that the two are confused because of differences in the basal leaf shape, and the number and shape of supplementary bracts.

Taking into account that the type material kept at P is notably ruined (lacking all the capitula), we consider appropriate to designate an epitype. We located another Cosson’s collection from the same trip and near to the locus classicus, dated 23 June 1854, that is best preserved and all the diagnostic characters are present. Thus, the sheet G-308021 is designated as the epitype for the replaced name S. atlanticus .

Selected specimens examined. ALGERIA. Béjaïa: Djebel-Babor , 36º29’N, 5º27’E, 24 June 1880, E . Cosson & V . C . Reboud 2931 ( G); in sylvaticis et rupestribus montis Tababor Kabylia orientalis, 36º32’N, 5º27’E, 21 July 1861, L . Kralik 125 ( G, MPU); Petite Kabylie, Djebel Babor, pentes exposées à l'est du sommet occidental, 36º29’N, 5º27’E, 15 June 1984, D. Podlech 39340 ( G, MA); Kabylie , Monts Babors , 36º29’N, 5º27’E, July 1897, E . Reverchon 210 ( G) . Blida: Atlas de Blida, sous les cèdres de Chréa , 36º25’N, 2º52’E, 21 June 1931, L . Faurel s.n. ( P) . Bouira: Djurdjura, près de Tikjda , sur le flanc S de Tigounatine, 36º27’N, 4º7’E, 28 June 1979, A . Dubuis 9768 ( MA); Djurdjura, mont Tigounatin , 36º26’N, 4º7’E, 8 June 1930, R . Maire 2457 ( P); Djurdjura, 3 km W Tikjda past Ain Allouane, 36º27’N, 4º6’E, 12 June 1984, D. Podlech 39203 ( G); Djurdjura , Azeron-n'Tirourda, 36º28’N, 4º14’E, 18 May 1904, H . A . Romieux 273 ( G) . Sétif: montagne de Magris [Megriss], 36º20’N, 5º21’E, June 1898, E . Reverchon 210 ( MA) . MOROCCO. Tanger-Tétouan: montis Gorgues ( Beni Hosmar ), 35º28’N, 5º21’W, 19 May 1930, P . Font i Quer 680 ( G, MA, MPU); Gorgues, 35º32’N, 5º22’W, 1 June 1930, J. Mas Guindal s.n. ( MA); Beni Hosmar , 35º28’N, 5º21’W, 8 May 1921, C . Pau s.n. ( MA) .

Figures

FIGURE 17. Distribution map for Senecio lopezii Boissier (∆) and S. perralderianus Cosson (●).

FIGURE 30. A–J. Senecio perralderianus Cosson—a. Habit (drawn from Dubuis 9769, MA).—b. Habit (drawn from Podlech 39203, G).—c. Capitulum (drawn from Dubuis 9769, MA).—d. Involucral bract (drawn from Dubuis 9769, MA).—e. Supplementary bract (drawn from Dubuis 9769, MA).—f. Ligulate floret (drawn from Podlech 39203, G).—g. Tubular floret (drawn from Podlech 39203, G).—h. Stamens (drawn from Podlech 39203, G).—i. Achene (drawn from Dubuis 9768, MA).—j. Indumentum of achene (drawn from Dubuis 9768, MA). K–P. Senecio trapezuntinus Boissier—k. Lamina of basal leave (drawn from Bourgeau 127, G).—l. Capitulum (drawn from Budak 2006, MA).—m. Involucral bract (drawn from Budak 2006, MA).—n. Supplementary bract (drawn from Budak 2006, MA).—o. Achene (drawn from Budak 2006, MA).—p. Indumentum of achene (drawn from Budak 2006, MA).