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Project Name Data (Last Modified On 6/17/2013)

Flora Data (Last Modified On 6/17/2013)
Genus Oyedaea DC.
PlaceOfPublication Prodr. 5: 576. 1836.
Note TYPE: 0. verbesinoides DC.
Description Large, erect, branched herbs; stems villous. Leaves opposite, simple, ovate, elliptical or obovate, often narrow, the, margins crenate-serrate, 3-veined from well above the base, tomentose; petioles mostly distinct, articulating at the base and leaving conspicuous ridges on the stem. Inflorescence an open, several-many- flowered panicle; bracts foliaceous; bracteoles sometimes present, opposed or not. Heads radiate, showy; involucral bracts numerous in several graded series, loosely imbricate, lanceolate, apically acute, indurate and even in texture, the veins obscure, puberulent; paleas scarious, conduplicate around the floret, with a ligulate apical appendage; receptacle slightly convex; ray florets several in 1 series, the corolla yellow, the ligule conspicuous, emarginate, pubescent on the veins, the androecium and style wanting, the ovary sterile, trigonous, the pappus with 3-4 awns and a row of short hairs; disc florets numerous, the corolla tubular, slightly expanded into a cylindrical limb, the 5 lobes dorsally puberulent, the anthers and narrowly deltoid appendages black, the basal auricles inconspicuous, the style branches with a short, pubescent apicule, the style basally immersed in a cylindrical, 1 mm tall, apically erose nectary, the ovary laterally flattened, pilose. Achene compressed with a suggestion of wings, glabrate; pappus a dense ring of basally concrescent hairs and two strigose awns.
Habit herbs
Distribution Oyedaea includes a few species of South America and one species ranges through Central America into Mexico.
Note It is distinguished mainly by its pappus which consists of two awns plus an intermediate ring of scalelike, basally fused hairs. The awns (Fig. 66) are not inserted at the edges of the achene as in Lasianthaea, but closer to the center. They at first move outwards and then bend back to point upwards. The loosely imbricate, narrow involucral bracts are also distinctive.
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