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Project Name Data (Last Modified On 6/20/2013)

Flora Data (Last Modified On 6/20/2013)
Species Senecio megaphyllus Greenman
PlaceOfPublication Publ. Field Columbian Mus., Bot. Ser. 2: 284. 1907.
Note TYPE: Costa Rica, "Bords du Paraita Grande au Copey," Tonduz 11700 (GH, not seen).
Description Coarse suffrutescent herb or shrub, 1-3 m tall, glabrate at maturity but with irregularly scattered arachnoid-villous tomentum, especially in and near the axils of the leaves. Leaves alternate, blade of well-developed upper leaves 8-15 cm long, 3-6 cm wide, about twice as long as wide, oblanceolate to elliptic, tapering serrate-dentate, the teeth callose-denticulate, pinnately veined; petiole winged, ca. 1/3 as long as the blade, weakly clasping at the base; uppermost leaves reduced to lanceolate, subsessile, subentire bracts, 3-5 cm long. Inflorescence a dense compound of several clustered corymbiform cymes arising terminally and in axils of the uppermost leaves, 10-20 cm across, the heads 40-60. Heads yellow- orange to orange; principal involucral bracts ca. 8, lanceolate to spatulate, scarious margined, tapering to a fimbriate tip, 6-7 mm long; calyculate bracts 2-4, linear, 3-4 mm long; receptacle flat with short, obscure, irregular scarious paleas less than 1 mm long; ray florets ca. 5, the tube 5-6 mm long, filiform, the ligule 5-8 mm long, 1 mm wide in dried specimens; disc florets 8-14, exceeding the involucre by 3-5 mm, the tube 6-8 mm long, the limb sharply distinct, 4 mm long, prominently lobed with sinuses ca. 2 mm deep, the style branches surmounted by a minute conical tuft of hairs. Achene broadly fusiform to columnar, glabrous, 2 mm long; pappus of white, capillary bristles in a single series, only slightly exceeding the involucral bracts.
Habit herb or shrub
Note This species occurs at high elevations, over 3,000 m, in the mountains of Chiriqui Province. It flowers in February and March. A curious single specimen, Stern et al. 1065, is tentatively referred here, pending acquisition-of more complete materials. The specimen is immature so positive identification is not possible, but the collectors refer to it as a "small tree, up to 8" dia." Furthermore, it was collected at an elevation below that expected for S. megaphyllus. It may represent an undescribed entity.
Elevation over 3,000 m
Specimen CHmIQUI: E of Boquete, Palo Alto, 5000 ft, Stern et al. 1065 (MO). Volcan de Chiriqui, Terry 1305 (MO). W slope of El Baru', Tyson & Loftin 6142 (MO).
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