Xyris arachnoidea Maguire & L.B.Sm.
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Authority
Maguire, Bassett & Wurdack, John J. 1964. The botany of the Guayana Highland--Part V. Mem. New York Bot. Gard. 10: 1-278.
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Family
Xyridaceae
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Scientific Name
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Description
Latin Diagnosis - Herbae acaules, cespitosae; foliis 15-18 cm longis; vaginis 3-4 cm longis, sulcatis, rubescentibus, basi abrupte triangulari-auriculatis, apice eligulatis et cum laminis confluentibus, intus longe denseque ciliatis, alibi glabris; laminis linearibus, apice subacutis et leviter falcatis, 1.3 mm latis, glabris, sulcatis, rugulosis, margine baud vel vix incrassatis; scapo 20-33 cm alto, glabro, ad apicem versus applanato, bicostato, 1 mm lato; vagina scapi eis foliorum simili, breviter laminata; spica obovoidea, 7-8 mm longa, pluriflora, dense arachnoidea; bracteis basilaribus valde reductis, alteris late ovatis, acutis, sepala subaequantibus, area dorsali magna carinata praeditis; sepalis lateralibus liberis, aequilateralibus, lanceolatis, acutis, 5.5 mm longis, late carinatis, glabris; placentis basilaribus, elongatis.
Distribution and Ecology - Distribution. Known only by the type collection.
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Discussion
Fig. 12, A-E.
Type. Flowers yellow, occasional. Savanna III, northwest base of Cerro Yapacana, alt. 150 m, Alto Rio Orinoco, 17 Mar 1953, Amazonas, Venezuela, Bassett Maguire & John J. Wurdack 34570 (holotype NY, isotype US).