Fruit indehiscent, achenelike silicles, oblong, ovate, elliptic, or oblong-linear, angustiseptate, sessile, sometimes constricted above seed-bearing portion; valves papery, corky and thick winged all around, veinless, glabrous or papillate; replum rudimentary; septum absent; style absent; stigma capitate, entire.

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Petals [3 or]4 or 5[-8], fascicles each with many to few stamens with filaments almost free to completely united, or ± completely connate , with anthers 1, 2, 4 or many-celled, basifixed or variously united; fasciclodes 4 or 5, antisepalous and free or ± united or absent; pistillode present or absent.

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Petals bright yellow, oblong-oblanceolate, 1.2-1.8 cm × 4-8 mm, 1.5-1.8 × as long as sepals; laminar glands lines, sometimes interrupted distally; marginal glands absent; margin entire; apiculus absent.

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Male flowers pedicellate or sessile; sepals 4-6, distinct, usually unequal, imbricate; petals absent; stamens 1-25, 1 to several whorls surrounding disk or outer ones inserted at margin or sinus of disk, inner ones inserted on disk; filaments free; anthers bilocular, usually introrse, rarely extrorse, longitudinally dehiscent; disk flattened or concave, margin shallowly or deeply fid; rudimentary ovary very small or absent.

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Cystoliths dotlike or very short blunt rods; stigma often on a style, mostly linear, less often penicillate-capitate; perianth lobes of female flowers usually connate into a tube, rarely strongly reduced, or absent, staminodes absent.

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Mm, widened at apex. Spikelets 4–8 × 1–1.5 mm, yellowish brown or purplish brown; lower glume absent; upper glume lanceolate-oblong to narrowly oblong with slightly falcate apex, obscurely 7–11-veined, midvein usually shortly excurrent; lemma lanceolate-oblong, 3–4 mm, 1-veined; palea absent.

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Male flowers: sepals 4-8, usually unequal, imbricate; petals absent; disk absent or obscurely glandular and between stamens (sometimes interpreted as staminodes); stamens 4-8, as long as or longer than sepals; filaments free; anthers 2-locular, introrse or extrorse, longitudinally dehiscent; pistillode usually enlarged at apex, depressed and bifid, usually pubescent.

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Female flowers 1-3 at base of inflorescence, sometimes absent; pedicel distinct; sepals [2 or]3, irregularly triangular, fused at base, glandless; petals and disk absent; ovary [2 or]3-locular, smooth, usually glabrous; style present; stigmas [2 or]3, undivided, glandless.

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Stamens as many as tepals and opposite these, rarely fewer than tepals; filaments free, united into a cup at base or ± entirely into a tube, filament lobes present or absent, pseudostaminodes present or absent; anthers (1- or)2-loculed, dorsifixed, introrsely dehiscent.

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Special staining methods, such as Masson and the Van Gieson staining were used to study the distribution of collogen fibers and elastic fibers. ResultsBy HE staining, the subepithelial connective tissues and vessels in the pterygium were more prominent than normal conjunctival tissues. An amorphous subepithelial superficial hyalinized zone and coarse eosinophilic granular materials were observed in the pterygia, but they were not found in normal conjunctival specimens. Coarse fibers were visible only in the deeper subepithelial connective tissues of pterygial samples. With Masson′s staining, the dense staining of collagen fibers was also more prominent in the pterygium than in the subepithelial connective tissues of normal conjunctiva. Abnormal collagen fibers were visible in the deeper sub-epithelial connective tissues of pterygial samples. With Van Gieson staining, abnormal collagen fibers were visible in the deeper subepithelial connective tissues. Dark coarse elastic fibers were found in the abnormal fibers only in the subepithelial deep connective tissues of pinguecula in the pterygia but not in the conjunctiva. With immunohistochemistry staining, MMP-3 was strong in the pterygial epithelium, moderate in fibroblast and absent from pterygial vascular walls. LN was strongly expressed in the blood vessel wall, moderately in the epithelial basement membrane and absent from the entire stroma.

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