Plectocephalus illapelinus (Phil.) Penneck. & Gl. Rojas, 2020

Penneckamp, Diego, Chaura, Rodrigo, Rojas, Gloria & Stuessy, Tod, 2020, Taxonomic notes on Plectocephalus (Centaurea s. l., Centaureinae, Asteraceae) from Chile, including new combinations and synonyms, Phytotaxa 437 (4), pp. 227-236 : 232-233

publication ID

https://doi.org/ 10.11646/phytotaxa.437.4.4

DOI

https://doi.org/10.5281/zenodo.13873873

persistent identifier

https://treatment.plazi.org/id/9B2E87F5-FFCA-F765-FF5F-F8ECFD078436

treatment provided by

Felipe

scientific name

Plectocephalus illapelinus (Phil.) Penneck. & Gl. Rojas
status

comb. nov.

Plectocephalus illapelinus (Phil.) Penneck. & Gl. Rojas View in CoL , comb. nov. ( Figure 4 View FIGURE 4 ).

Basionym:— Centaurea illapelina Philippi (1895: 43) View in CoL . Type:— CHILE: Coquimbo Region, Elqui Province , El Peñon, R. A. Philippi s.n. (Holotype SGO 000005197 About SGO !; isotype SGO 000005196 About SGO !) .

Shrub ca. 0.6–0.8 m, perennial, branched, lignified at base, green-gray. Stems densely puberulent-tomentose, woollywhite at the base and glabrescent toward apex. Leaves narrowly pinnatifid to pectinate-pinnatifid, deeply divided, sessile, tomentose and glaucous, (1.5–)2.5–6.5(–12.5) × 1–2.5 cm, with 4–6 pairs of linear segment pairs opposite or slightly subopposite, (0.3–)0.5–1.6(–2) × 0.1–0.2(–0.3) cm, margin of segments entire or sometimes toothed, at apex acute, submucronate, or mucronate. Upper leaves of floral stem smaller and irregular, peduncle striated, glabrescent, with few leafy bracts, heads borne singly. Involucre hemispheric, subcampanulate, 2–3 cm diam. Phyllaries many in 5–6 series, lanceolate to narrowly lanceolate, acute, glabrescent on adaxial surface except at margin and sometimes basal phyllaries minutely pubescent. External phyllaries shorter and broad, 5–7 × 2–3 mm, inner phyllaries longer and narrower, 15–25 × 2–4 mm, with apex expanded into an erect spreading pectinate-fringed coriaceous appendage 1/4–1/3 of total phyllary length. Most inner phyllaries notably narrower and longer, linear-lanceolate. Ray flowers sterile, 3 × 0.3–0.4 cm, corolla 5-lobed, lobes lanceolate to narrowly lanceolate with acute apex, 1.2 × 0.3 cm, tube of (1–) 1.5–1.8 cm long. Disc florets tubular, smaller than ray florets, fertile and hermaphroditic, 1.6–2.1 × 0.2 cm, corolla 5-lobed, lobes acute, separated c. 1/3 of total corolla length. Corolla white to pale pink. Style with bifid stigma, 1–2 mm longer than anthers. Anthers ca. 8 mm long. Ovary ca. 3 mm long. Mature cypselae not seen.

Etymology:—From the type locality around Illapel, Coquimbo Region, northern Chile.

Distribution and ecology:—Plant from xerophytic shrubland communities, not along the coast.

Notes:—This species was synonymized by Reiche (1905) under Centaurea floccosa , but Plectocephalus illapelinus is different from P. floccosus by having a smaller capitulum and deeply pinnatifid leaves with narrow linear segments. This species is also similar to P. bridgesii , but the former is distinguished by its puberulo-tomentose stems and phyllaries without dark-colored appendages in contrast to glabrous stems and phyllaries with dark-colored appendages in the latter. As for the distribution, P. illapelinus does not grow along the coast, whereas P. floccosus and P. bridgesii are typical in the coastal vegetation.

Specimens examined: — CHILE. Atacama Region: Huasco Province: Embalse Santa Juana , nuevo mirador (28°40’ S, 70°38’ W), 670 m, 16 Oct 2010, A. Moreira 1312 ( SGO 160832 About SGO ) GoogleMaps ; Embalse Santa Juana , mirador, km. 670 (28°40’27’’ S, 70°36’41’’ W), 800 m, 12 Nov 2004, Fundación Philippi 92 ( SGO 167510 About SGO ) GoogleMaps ; Cuesta Pajonales , en cima, lado sur (29°9’ S, 70°58’ W), 1200 m, 27 Oct 1984, M. Muñoz 2015 ( SGO 108071 About SGO ) GoogleMaps ; Vallenar, Cuesta de Pajonales (29°07’ S, 71°01’ W), 1200 m, 10 Oct 1987, S. Teillier 1027 ( SGO 141718 About SGO ) GoogleMaps . Coquimbo Region: Elqui Province: Andacollo (30°15’ S, 71°4’ W), 800–1000 m, 24 Oct 1991, A. Brinck s.n. ( SGO 122806 About SGO ) GoogleMaps ; Quebrada San Carlos, c. 5 km al Oeste de Vicuña, a los pies del Cerro Tololo , Valle del Río Elqui (30°4’ S, 70°49’ W), 600–800 m, 11 Nov 1974, C. Villagrán, R. Torres & R. Osorio s.n. ( SGO 126616 About SGO ) GoogleMaps .

R

Departamento de Geologia, Universidad de Chile

A

Harvard University - Arnold Arboretum

M

Botanische Staatssammlung München

S

Department of Botany, Swedish Museum of Natural History

C

University of Copenhagen

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Asterales

Family

Asteraceae

Genus

Plectocephalus

Loc

Plectocephalus illapelinus (Phil.) Penneck. & Gl. Rojas

Penneckamp, Diego, Chaura, Rodrigo, Rojas, Gloria & Stuessy, Tod 2020
2020
Loc

Centaurea illapelina

Philippi 1895: 43
1895
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