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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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Synedrella Gaertn.
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PlaceOfPublication
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Fruct. 2: 456, tab. 171, fig. 7. 1791, nom. cons.
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Note
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TYPE: S. nodiflora (L.) Gaertn.
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Synonym
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Ucacou, Adanson, Fam. 2: 615. 1763. LECTOTYPE: U. nodiflorum (L.) Hitchc. Ukakou, Adanson, Fam. 2: 615. 1763, nom. nud. Ucacea, Cass., Dict. Sci. Nat. 29: 489. 1823. Revised spelling of Ukakou Adanson.
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Description
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Branching herb, erect or procumbent. Leaves opposite, chartaceous, serrate, pubescent with appressed white hairs; petiole winged, short. Inflorescences fascicles of heads in the leaf axils; peduncles short, sometimes with foliaceous bracts. Heads radiate, cylindrical; involucral bracts several, imbricate, the outer- most green, those inward scarious, narrower; receptacle convex, minute; ray florets 4-5, the corolla yellow with a substantial, narrow tube and broad limb, apically denticulate, the style branches slender, pilose, the ovary dorsiventrally flattened, with broad, apically erose margins, 2 awns evident; disc florets several, the corolla tube nearly as long as the angled, obconical limb, the short lobes dorsally pubescent, the anthers dark, the appendages dark, ligulelike, the basal auricles rounded, the style branches slender, flattened, marginally pilose, the style base not expanded but inserted in a slender, elongate, apically erose, stipitate nectary, the ovary oblong, slender, with 2 apical awns and a thick cap. Achenes dimorphic, those of the ray florets flat with. broad, light colored, toothed margins and 2 short apical awns, those of the disc florets slender, tuberculate, with 2 sturdy, diverging strigose awns.
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Habit
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herb
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Distribution
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A monotypic genus ranging through the tropics
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Note
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Synedrella may be recognized by its fascicles of inconspicuous heads and by the two distinct types of achenes.
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