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| Senecio scapioides Aguilar-Cano & D.J.N.Hind in Aguilar-Cano & Hind, 2020. |
Summary
Routine use of the virtual herbarium of the collections in COL (Instituto de Ciencias Naturales de la Universidad Nacional de Colombia) revealed the presence of an as yet undescribed species of Senecio amongst the material of Senecio adglacialis and S. leucanthemoides. Following subsequent herbarium studies and fieldwork, Senecio scapioides (Compositae: Senecioneae: Senecioniinae), from the Departamento de Boyacá, in Andean Colombia, was recognised and is described and illustrated; it is compared with S. adglacialis and S. leucanthemoides. Notes on its distribution and habitat, conservation status, phenology, and etymology are also provided, and the distribution of the three species mapped.
Key Words: Asteraceae, checklist, digitisation, Flora of Colombia
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| Senecio scapioides at the type locality. A habitat; B habit; C basal part of stem and basal leaves; D top view of capitulum; E lateral view of capitulum. All from Aguilar-Cano 4434. Photos: José Aguilar-Cano. |
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| Senecio scapioides. A habit; B disc floret; C disc floret corolla opened out showing stamen arrangement; D adaxial surface of apex of disc floret corolla lobe; E abaxial surface of apex of disc floret corolla lobe; F anther cylinder opened out; G stamen; H disc floret style; J apex of disc floret style arm showing the truncate apex with a tuft of irregularly distributed papillae; K ray floret; L ray floret style; M calycular bract; N phyllary; P apex of ray floret style arm with apices truncate covered by regularly distributed papillae; Q unicellular trichome from a calycular bract; R unicellular trichome from achene; S multicellular uniseriate trichome from phyllary. All from Aguilar-Cano 4434 (holotype FMB). Drawn by Gustavo Surlo. |
Senecio scapioides Aguilar-Cano & D.J.N.Hind, sp. nov.
RECOGNITION. In habit, leaf shape and yellow radiate capitula Senecio scapioides resembles S. adglacialis but the new species differs in having a densely arachnoid indumentum and in being sericeous pubescent on its stems, abaxial leaf surface and involucre (vs sparsely arachnoid and sericeous pubescent), generally longer glandular trichomes (1.2 – 2.5 mm long vs 0.5 – 1.7 mm long), possessing solitary capitula (vs inflorescences densely sub-corymbiform, 3 – 5-headed, very rarely single-headed on dwarf specimens, e.g. van der Hammen 1317), an involucre of fewer phyllaries (15 vs 20) and fewer ray florets (16 – 18 vs 24). (Figs 1, 2 & 3), (Table 1).
ETYMOLOGY. The specific epithet derives from the Latin scapus (scape) and -oides (like) and alludes to the scapiform inflorescence of the species.
José Aguilar-Cano and D. J. Nicholas Hind. 2020. Senecio scapioides (Compositae: Senecioneae: Senecioniinae): A New Species from the Departamento de Boyacá, in Andean Colombia. Kew Bulletin. 75: 35. DOI: 10.1007/s12225-020-9884-4
Resumen: Revisiones rutinarias del herbario virtual de las colecciones en COL (Instituto de Ciencias Naturales de la Universidad Nacional de Colombia) reveló la presencia de una especie aún no descrita de Senecio entre el material de Senecio adglacialis y S. leucanthemoides. Como resultado del trabajo de herbario y campo subsiguientes, Senecio scapioides (Compositae: Senecioneae: Senecioniinae), del Departamento de Boyacá, en los andes colombianos, fue reconocida e ilustrada; la nueva especie se compara con S. adglacialis y S. leucanthemoides. Adicionalmente se discute su distribución y hábitat, estado de conservación, fenología y etimología, así como el mapa de distribución geográfica de las tres especies.
