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(Last Modified On 6/20/2013)
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(Last Modified On 6/20/2013)
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Species
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Senecio cooperi Greenman
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PlaceOfPublication
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Publ. Field Columbian Mus., Bot. Ser. 2: 284. 1907.
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Note
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TYPE: Costa Rica, Cartago, Cooper 5803 (GH, not seen).
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Description
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Coarse herb with turgid, pithy stems, (1-)2-3 m tall, the uppermost internodes and branches in the inflorescence scabrous-pilose with dark-tipped hairs, at least some of which are glandular. Leaves alternate; blades 10-40 cm long., (5-) 10-20 cm wide, about twice as long as wide; well-developed leaves elliptic to broadly lanceolate or oblanceolate, the largest subpandurate, tapering or abruptly contracted, the margin serrate-dentate with callose-denticulate teeth 4-5 mm apart, pinnately veined; petiole ca. 1/2 as long as the blade, prominently winged, the wing irregularly undulate, amplexicaul at the base; lower leaves glabrescent, but with lower surfaces scattered villous, especially on the veins; uppermost leaves becoming lanceolate subsessile bracts 10-20 cm long. Inflores- cence a series of open, compound corymbiform to paniculate cymes, with 30-60 (-200) heads, arising terminally and from the axils of upper leaves. Heads distinctly cylindrical and spreading only slightly in age, yellow or yellow-orange, radiate and fragrant; principal involucral bracts about 8, linear oblong, 8-10 mm long, 1 mm wide, the margins prominently scarious, erose at the apex; calyculate bracts 1-3, inconspicuous; receptacle flat with a few short scarious paleas irregularly interspersed among the achenes; ray florets ca. 5-8, thin and narrow, the tube 6-8 mm long, subfiliform, the ligule disposed at a right angle to the involucre but becoming lax in age, ca. 10 mm long and 1 mm wide in dried specimens; disc florets 10-18, exserted 4-6 mm beyond the involucre, the tube slender, 8-10 mm long, the limb funnelform, 3-5 mm long, deeply 5-lobed. Achene pubescent, narrowly fusiform to suburceolate, terete, 2-3 mm long, only occa- sionally filled and therefore presumably of low fertility; pappus of white, uniseriate, capillary bristles.
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Habit
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herb
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Note
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Senecio cooperi occurs in clearings, steep slopes, and disturbed sites in forested areas, mostly above 2,000 m, in the mountains of Chiriqui and adjacent Bocas del Toro. Apparently flowering the year round, the species has been most often collected in July, August, and September.
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Elevation
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above 2,000 m
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Specimen
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BOCAS DEL TORO: N slopes Cerro Horqueta, Allen 4999 (US). CHIRIQUI: Trail from Cerro Punta to headwaters of Rio Caldera, Allen 1452 (NY, US). Cerro Punta, Blum et al. 2425 (MO). Between Bambito and Cerro Punta, Croat 10535 (MO, NY). NW Nueva Surina, Croat 13530 (MO, NY). NW side of Cerro Pando, Croat 15947 (MO). W of Cerro Punta, Croat 22419 (MO). Above Cerro Punta, D'Arcy 5351 (MO). La Popa, above Boquete, D'Arcy & D'Arcy 6406 (MO). Cerro Punta, D'Arcy & D'Arcy 6525 (MO). Cerro Pando, D'Arcy & D'Arcy 6639 (MO). Bajo Chorro, Boquete, Davidson 236 (MO, US). Cerro Horqueta, Dwyer et al. 432 (MO, US). Boquete, Dwyer 6997 (MO). Cerro Punta, Gentry 5867 (MO); King 3303 (US). Cerro Horqueta, Maurice 864 (MO, US). Nueva California, Tyson 6687 (MO). Finca Lerida, Woodson & Schery 231 (MO). Near Bajo Mona and Quebrada Chiquera, Woodson & Schery 515 (MO). Bajo Mona, Woodson et al. 1014 (MO, NY).
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