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(Last Modified On 6/18/2013)
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(Last Modified On 6/18/2013)
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Genus
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Hidalgoa LaLlave & Lexarza
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PlaceOfPublication
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Nov. Veg. Descr. 1: 15. 1824.
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Note
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TYPE: H. ternata LaLlave.
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Description
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Vines climbing by hooked petiole bases; stems weak, slender, sulcate, puberulent, sometimes woody at the base. Leaves opposite, trifoliolate, 1-2-pinnate or palmately compound, the leaflets lobed or serrate; petioles mostly elongate and slender, the basal portion often lignified, recurved and following detachment of the apical portion, becoming a stout hook. Inflorescences axillary, mostly few or solitary along the stem; leaflike or scalelike bracts mostly present; scalelike bracteoles occurring sometimes along the petiole. Heads radiate, sometimes showy; involucral bracts in 2 dissimilar series, the outer series ca. 5, linear, porrect, the inner series broad, membranaceous, imbricate; ray florets 5-8, the corolla variously colored, apically minutely denticulate, drying prominently longitudinally nerved, the ovary dorsiventrally flattened, rectangular, surmounted by 2 stout, hornlike processes; disc florets numerous, the corolla tubular, long exserted from the paleas, 5-lobed, glabrous, the anthers basally obtuse or subauriculate, the appendages short, the style long exserted, branched or not, granular, the ovary sterile. Achenes (after Sherff) obcompressed, elongate-linear, mostly biaristate.
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Habit
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Vines
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Distribution
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Hidalgoa includes 4 species which range from Mexico (Vera Cruz) to Peru.
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Note
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The plants are apparently rarely collected members of the liana-canopy accom- paniment of forests. Only one species occurs in Panama. The genus superficially resembles Bidens but differs markedly in a number of features, e.g., the hooked, lignified petiole bases, the porrect outer involucral bracts, the flat, rectangular ovaries of the ray florets and the abortive ovaries of the disc florets. The heads apparently appear in many colors. To judge from the shape of the achenes, the genus is related to Bidens, particularly such species as B. vulgata E. L. Greene of Canada and the northeastern United States.
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