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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 boquetensis Standley
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PlaceOfPublication
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Publ. Field Mus. Nat. Hist., Bot. Ser. 22: 394. 1940.
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Note
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TYPE: Panama, Pittier 5382 (F, holotype, not seen; US, isotype).
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Description
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Erect herb or subshrub, 1-2 m tall, the upper and middle nodes often swollen, the middle internodes variously lanate-villous to arachnoid, glabrescent. Middle cauline leaves alternate, 6-12 cm long, 3-7 cm wide, about twice as long as wide, lanceolate to narrowly elliptic, tapering basally to a conspicuously lobulate- undulate, winged petiole, sometimes with 2-3 pairs of prominent lateral lobes, pinnately veined, the margins serrate-dentate, callose-denticulate, closely short- pilose above, densely-to irregularly lanate-villous beneath; petiole about as long as the blade or slightly less, basally clasping; upper cauline leaves reduced to sessile, clasping, deeply serrate to parted bracts, 3-7 cm long. Inflorescence a loose to tight agglomeration of 1-6 corymbiform cymules of 8-15 heads each, arising terminally or from the axils of upper cauline leaves; peduncles sparsely pilose to glabrate, sometimes purplish. Heads with orange florets and purple or near- purple involucres, sometimes parasitized by an insect gall in the receptacle; principal involucral bracts 13-17(-18), elliptic-lanceolate, tapering to a weakly erose apex, (7-)8-9 mm long; calyculate bracts 6-10, conspicuous, spreading or sometimes reflexed, linear-subulate, 5-10 mm long; receptacle flat, subalveolate with short irregular teeth (paleas) projecting ca. 0.5 mm upwards between the achenes; ray florets ca. 8 but sometimes absent, even on some plants with otherwise radiate heads, the tube 5-6 mm long, the ligule 9-12 mm long, 2-3 mm wide in dried- specimens, sometimes irregularly 2-3-lobed apically; disc florets 20-30, the corolla 6-9 mm long at anthesis, not sharply distinguished into tube and limb, the lobes conspicuous with sinuses 2-3 mm deep. Achene columnar or weakly fusiform, 2-3 mm long, hispid-hirsute, sometimes sparingly so; pappus a single series of white capillary bristles, equalling or slightly exceeding the involucre.
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Note
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Senecio boquetensis occurs in open, damp rocky sites or disturbed swampy places at 1,000-3,000 m elevation in the mountains of Chiriqui Province. Flowering specimens were collected from December to January but one specimen was collected in April.
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Elevation
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1,000-3,000 m
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Specimen
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CHIRIQUI: Upper valley of Rio Chiriqui Viejo, Allen 1586 (MO). N of Volca'n City, Duke 9029 (MO). Vic. of Boquete, Lewis et al. 353 (MO). Between Cerro Vaca and Hato de Loro, Pittier 5382 (US). Chiriqui Viejo Valley, White 94 (MO). Between El Hato and Volcain de Chiriqui, Wilbur et al. 15397 (MO).
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