Mapania cuatrecasasii T.Koyama
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Authority
Maguire, Bassett. 1967. The botany of the Guayana Highland--Part VII. Mem. New York Bot. Gard. 17: 1-439.
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Family
Cyperaceae
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Scientific Name
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Description
Species Description - Prope M. imeriensem accedit, tamen ab ea valde differt fructificationibus monoribus late ellipsoideis 2 mm longis parte spongiosa brevi et glumis subduplo longioribus parte superiori pilis tuberculosis sparce pubescentibus. Planta robusta. Folia radicalia fascicularia et summa tantum caulina remota; laminae late lineares 90-200 cm longae 3.5-5 cm latae unicostatae subcrasse herbaceae ad apicem longissime acuminatam sensim attenuantes basi in vaginas 10-20 cm longas antice fuscescentes sensim attenuantes, marginibus supra medium praesertim apicem versus serrulatoscabris. Culmus solitarius centralis 60-90 cm altus trigonus medio ca 6 mm erassus et monophyllus, angulis laeviusculis sed sub inflorescentia scabris. Inflorescentia corymbosa 10-17 cm longa ac lata explicata; axis parum elongatus 2- vel 3-nodosus, internodio 3-20 mm longo, angulis valde scabris; bracteae plerumque 3 foliaceae valde inaequales patentes, ima longis-sima 40-80 cm longa 3-4.5 cm lata apice gradatim longissime acuminata margine ex toto seabra; radii 8-15 e prophylla enati Aalde inaequales usque ad 10 cm longi 2 mm crassi antice laeviter canalieulati granulato-scabridi capitulo unico termnati; bracteolae glumiformes spica breviores vel cum ea aequantes; prophylla ochreiformia 1-2 cm longa papyracea 2-costata fusca ventre profunde bifurcata apice bifida; capitula globosa vel inconspicue bi-vel tri-lobata maturitate 2-3 cm in diametro multispiculata fulva. Spicae oblongo-ellipsoideae 10-15 mm longae ca 7 mm crassae spice obtusiusculae multispiculosae. Glumae ovato-oblongae vel lanceolatae 4-5.25 mm longae 1.5 mm latae herbaceae uninerviae parte apicali dorso et ad marginem pilis tuberculosis sparsim pubescentes apice contractae acutiusculaeve. Squamellae 4 lineari-lanceolatae, 3.5-4.5 mm longae hyalinae; inferiores 2 lateraliter oppositae plicatae costa distincta ad apicem scabrae, superiores 2 subdorsiventrales planae. Fructificationes late ellipsoideae crasse biconvexae 2-2.25 mm longae 1.3-1.5 mm latae facie brunneo-fulvae cellulis iso-diametricis punctulatae nitidulae apice basique contrac-tae, parte spongiosa ca 1/3 mm longa subcrescentiformi; stylus elongatus, stigmatibus 2.
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Discussion
Type. Forest at Veneral, Rio Yurumangui, 5-50 m alt., Pacific Coast, Dept, of Valle, Colombia, J. Cuatrecasas 15718 (holotype US, isotype VALLE).
Mapania cuatrecasasii superficially resembles M. imeriensis, but differs from it in the larger glumes having tubercle-based hairs toward their apices and relatively poorly developed spongy portion of the fructifications. In this species the spongy portion of fructifications is depressed-conical or crescentiform and is less than one half as long as the basal portion of fructifications containing an achene (Fig. 12, H, I), while in M. imeriensis the spongy portion of fructifications are beak-like and as long as to three times longer than the base containing an achene (Fig. 13).
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Distribution
Uncommon in northern South America.
Colombia South America| Guyana South America|