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(Last Modified On 6/13/2013)
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(Last Modified On 6/13/2013)
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Species
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Gnaphalium attenuatum DC.
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PlaceOfPublication
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Prodr. 6: 228. 1838.
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Note
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TYPE: Mexico, Berlandier 70 (P).
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Description
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Erect, sparingly branched ephemeral herb to 70 cm tall; stems lanate with dirty white, arachnoid, appressed hairs, later glabrescent or floccose, striate when glabrous. Leaves linear-lanceolate to 6-11 cm long, 6 (-10) mm wide, apically long acute or acuminate, basally contracted and slightly decurrent on the stem, the margins entire or nearly so, above glabrate but usually with wisps of arachnoid hairs, beneath lanate with dirty white hairs, and the midvein prominent or obscure, leaves smaller and linear near the inflorescence. Inflorescence a much or little branched, open panicle of clusters of flower heads; occasional linear bracts present. Heads disciform, 3-5 mm tall; involucral bracts imbricate, unequal, acute or obtuse, not chalky; receptacle 0.8-1.5 mm across, flat or slightly convex, muricate- punctate, often dark; ray florets many, ca. 3 mm long, the corolla capillary, slightly expanded at the nectary, apically 2-5-notched; disc florets several, ca. 3 mm long, the corolla tubiform, slightly expanded or bulbous at the nectary, the limb 5-lobed, glabrous, the anthers ca. 0.7 mm long, the basal tails fimbriate, the apical appendages narrowly deltoid, slightly longer than broad, the style branches equal, truncate and apically glandular-papillose, the nectary prominent, elevated above the top of the ovary- Achene reddish brown, 0.8 mm long, ellipsoidal, indistinctly 4-5-nerved and irregularly longitudinally striate; pappus basally strigose, bristles in one series about as long as the corolla, falling independently or in small weakly held groups.
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Habit
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herb
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Note
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This species is intermediate in some respects between Gnaphalium domingense and G. roseum. From G. domingense it differs in having conspicuously narrower leaves near the inflorescence and the leaf-uppersides mostly somewhat pubescent and eglandular. The involucral bracts also differ in not being chalky. From G. roseum it differs in its usually greater stature and more open inflorescence. The involucral bracts are not numerous near the inflorescence. The name G. attenuatum is used here following a review of material annotated by Klatt in several herbaria.
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Specimen
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CHIRTQUf: Summit and W face of Cerro Copete, 9000 ft, Allen 4896 (MO). 20' km W of Puerto Armuelles, 400-600 m, Busey 549 (MO). Trail N of Cerro Punta, Croat 10529 (MO). Palo Santo, 3 mi N of Volcan, Croat 13538 (MO). Above Cerro Punta on slope of Cerro Respinga, D'Arcy & D'Arcy 6542 (MO). Lava fields near Volcan, 4600 ft, Duke 9198 (MO). Along Boquete Trail, Cerro Respinga, 200-25,00 m, Gentry 5936 (MO). Mountains beyond La Pintada, 400-600 m, Hunter & Allen 604 (MO). 6.7 mi W of Boquete, 8000 ft, Luteyn 1496 (MO). Alto Boquete, 1125 m, Partch 69-85 (MO). Cerro Pando, valley of upper Rio Chiriqui Viejo, White 12 (MO). Volcan de Chiriqui, 3500-4000 m, Woodson & Schery 421 (GH, MO).
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