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(Last Modified On 6/5/2013)
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(Last Modified On 6/5/2013)
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Genus
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Gongrostylus R. M. King & H. Robinson
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PlaceOfPublication
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Phytologia 24: 387. 1972.
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Note
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TYPE: Eupatorium costaricense Kuntze.
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Description
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Sparingly branched slender vines with terete subglabrous stems. Leaves opposite with short distinct petioles; blades ovate, the base rounded, the margins serrate, the veins trinervate from near base. Inflorescence terminal and axillary, corymbose-paniculate, the ultimate branches often long and slender. Heads discoid with ca. 20 florets; involucral bracts subimbricate, in 3-4 very unequal series, narrowly lanceolate to linear; receptacle slightly convex, glabrous; corolla narrowly funnelform, the lobes triangular with glands on outer surface; anther collars elongate with short-oblong to elongate cells, the cell walls with transverse annular thickenings, the anther appendage short, only half as long as wide; style base with nodulose enlargement, densely hirsute, the style appendages narrow and slightly mamillose below, greatly enlarged and smooth apically. Achenes prismatic with 5 ribs, glabrous; carpopodium large, forming a distinct short cylinder, the basal row of cells greatly enlarged, numerous upper rows of cells small and subquadrate, the cell walls thickened; pappus of ca. 30 scabrous bristles in 1 series, persistent, the bristles scarcely narrowed toward tips, the apical cells subacute.- Pollen with short spines.
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Habit
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vines
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Note
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Gongrostylus is a monotypic tropical American genus readily distinguished among the Eupatorieae of Panama by the greatly enlarged tips of the style branches. In spite of the difference in appearance, the genus is closely related to Ayapana, having the same distinctive carpopodium structure and the same type of enlargement of the style base.
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Reference
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King, R. M. & H. Robinson. 1972. Studies in the Eupatorieae (Asteraceae). CIV. A new genus, Gongrostylus. Phytologia 24: 387-388.
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