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130 FIELDIANA: BOTANY, VOLUME 28 RAPATEACEAE Rapatea Steyermarkii Maguire, sp. nov. Herbae terrestres perennantes. Caudex adscendens erectusve, 10-20 cm. longus. Folia 8-10, 50-65 cm. longa; vaginis equlcantibus distichisque, in dispositione paullum helicoideis, 12-15 cm. longis, 1.5-3.5 cm. e costa ad marginem, 10-15-nervatis, vix brevi-castaneostrigosis, scarioso marginatis, paullatim arctatis in petiolum alatum ca. 1 cm. longum; laminis 40-50 cm. longis 5-7 cm. latis, supra tenuiter celluloso-punctatis, infra similiter punctatis atque conspicue glanduloso-papillatis, 70-80-nervatis , e costa prominenti nervis lateralibus valde adscendentibus, apice fa Ic ato-a eliminate, basi inaequilacerali, abrupte constricto. Pedunculi solitarii vel pauci, 3-5 cm. longi, ca. 1.5 cm. lati, in maturitate valde recurvati; involucri bracteis 2, late cordatis ca. 5 cm. latis ad basim, 6-7 cm. longis, ad apicem abrupte caudatis; receptaculi bracteis scariosis 12-18 mm. longis utrinque pubescentibus uninervatis; pedicellis ca. 1 cm. longis 2 mm. crassis paullum compressis castaneo-pubescentibus; spiculis ca. 2 cm. longis sepalis expansis exclusis; bracteolis 9-11, paullum gradatis, exterioribus 12-13 mm. longis 5 cm. latis, interioribus 17-20 cm. longis, 3.5-4.0 mm. latis, acutis brevipungentibus, apiculo ca. 1 mm. longo, corpore tr in erva to, utrinque pubescentibus. Perianthium non vis urn; ovario triloculari, ovulo uno in loculo. Capsula 7-8 mm. longa, basi subscarioso, sursum indurata; semine 5 mm. longo, cylindrico-oblongo, griseo-brunneo striato, hilo basilari obliquo, concavo. Type in herb. Chi. Nat. Hist. Mus., collected in shaded wet woods of a dwarf type, lower southeastern slopes of Carrao-tepui, state of Bolivar, alt. 1675-1980 m., Dec. 5-6, 1944, Julian A. Steyermark 60868, "leaves arising at base from an elongated caudex or old stem several inches to a foot from the ground, then the leaf bases or sheaths themselves in a fan-like arrangement, but the blades in a spiral or several-ranked arrangement, not in a single rank as in Stegolepis; leaves firmly membra naceous, dull green above, silvery green-papillate below." Rapatea Steyermarkii is most closely related to R. Ulei Ducke, which it strikingly resembles superficially. Aside from its distinct geographic and ecologic isolation, our plant is at once recognized by its short peduncle, smaller head, and much larger spikelets, and by the conspicuously glandular-papillate leaves, noted in the field by the collector. Stegolepis Gleasoniana Steyermark, sp. nov. Foliorura vaginae conduplicatae ovatae, apice rotundatae vel obtusae, nitentes membranaceae, nervis manifestos; laminis crassis coriaceis rigidis late linearibus erectis, subtus pallido-viridibus, 90-95 cm. longis, 8-22 ram. latis, in parte media latissimis, ad extremes angustatis, inaequilateris, apice acuminatis, uno latere costa
BOTANICAL EXPLORATION IN VENEZUELA - I 131 media prominent! incrassata, 7-10nervis uno latere, 10-12 nervis alio latere; scapis elongatis tenuissimis, 40-45 cm. longis, 1 mm. crassis, glabris, paucisulcato-striatis, apice paullo dilatatis; involucre nullo nisi bracteis 3 infimis quam vicinis multo longioribus; floribus 1 vel 2 infrequente 4; bracteis brunneis, extimis 3 vel 4 membranaceis majoribus inaequalibus anguste lanceolatis longe acuminatis, 14-18 mm. longis, 3 mm. latis, intermediis 11 brevioribus anguste lanceolatis, longe acuminatis (exterioribus) vel late lanceolatis vel ovatis, breve- vel longe-acuminatis ( interiorib us), 6.5-7 mm. longis, 2.5-3 mm. latis (interioribus) ad 8-9 mm. longis, 2-3 mm. latis (exterioribus); sepalis unguiculatis, laminis in anthesi exsertis erectis lanceolatis acutis; petalis unguiculatis, laminis suborbicularibus, apice subacutis; filamentis lineari-subulatis, 6 mm. longis, in parte inferiore paullo latioribus; antheris lineari-subulatis, 10 mm. longis, poro terminali introrso dehiscentibus; ovario late ovoideo, 2 mm. longo; stylo filiformi, 11 mm. longo; ovulis in quoque loculo 8-10; capsula 4-5 mm. longa; seminibus rhomboideo-oblongis, purpureo-brunneis, 1.5 mm. longis, circiter 20-costatis, striis reticulatis. Sheaths thin, membra naceous, finely nerved, rounded or obtuse at summit; leaves somewhat asymmetric, broader in middle part, narrowed at each end, deep green above, pale green below, midrib prominent and thickened on one side, the nerves on either side of midrib prominent only on one surface (lower), unequal in number; scapes very slender and elongated; the three outermost bracts foliaceous, unequal and elongated, equaling the flower; sepals brown, the blades rigid, chartaceous, cucullate-incurved, 12-13 mm. long, 4.5-5 mm. wide, the claw membranaceous, oblong-rhomboid, slightly enlarged at junction with blade, 4 mm. long, 3 mm. wide, 7-nerved; petals deep yellow, the blade suborbicular, abruptly narrowed to subacute tip, 16 mm. long, 14 mm. wide, the claw 5 mm. long, 2 mm. wide; fertile stamens 3-5, one to three of them becoming partly or completely petaloid; filaments slightly broader in lower half, 6 mm. long, 1.1 mm. wide near base;ovary with 3 cells, 8-10 ovules in each cell (Fig. 17, c-e). Type in herb. Chi. Nat. Hist. Mus., collected on moist fluffs of Cerro Duida, southeastern-facing sandstone bluffs near Cano Negro (tributary of Cano Iguapo), Territorio Federal Amazonas, alt. 1095- 1520 m., August 26, 1944, Julian A. Steyermark 58040. This species is remarkable for the elongated foliaceous outer bracts of the heads. In its slender filiform it peduncles resembles S. Allenii Steyermark of Panama, but that has the leaf sheaths tapering rather than abruptly rounded at the summit, while, moreover, in S. Allenii the flowers are much smaller and the bracts are strongly imbricate. Stegolepis Gleasoniana appears to be related to S. pauciflora Gleason, from which it differs in the shorter sepals and petals, more slender, almost filiform scapes, which are much narrower- below the heads than in 5. pauciflora, elongated membranaceous outermost 3-4
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o 2 CM XI E> RAR.Y OF THL UNIVERSIT
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FIELDIANA: BOTANY A Continuation of
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NUMBER 1 LIST OF ILLUSTRATIONS TEXT
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PAGE 67. Emmotum ptarianum 342 68.
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CONTRIBUTIONS TO THE FLORA OF VENEZ
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BOTANICAL EXPLORATION IN VENEZUELA
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