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46 FIELDIANA: BOTANY, VOLUME 28 and the longer-beaked, larger, and more shining achenes which are less prominently reticulate with cells broader than high, while from R. Lechleri Steud. of Peru it differs in the broader leaves which are not scabrid-serrulate on margins, and in various floral characters. The distinguishing characteristics of R. ptaritepuiana are the elongate, narrow leaves, clustered more at the base of the culm, and not conspicuously scattered on the culm, the short brown panicles, the shining achene marked with transversely broader than high superficial cells, the elongate bilobed tubercle, and the 6 bristles which equal or are longer than the achene. Rhynchospora sanariapensis Steyermark, sp. nov. Annua caespitosa; foliis setaceis, glabris, 2.5-5 cm. longis; culmis filiformi-setaceis, glabris, 7-10 cm. altis; corymbis terminalibus, glomerulis, 8-12 mm. altis, 5-12 mm. latis; floribus 6 vel pluribus; spiculis lance olato-subulatis, 2-floris, 1-carpis, 3-3.5 mm. longis; squamis 4, ovatis vel lanceolatis, acutis; stylo diviso; setis nullis; achaenio oblongo-obovoideo, 0.9-1 mm. longo, 0.5 mm. lato, transversim profunde 4-5-sulcato et prominente gibbo elevato, inter gibbo subtilissime longitudinaliter stria to; tuberculo breve depresso, 0.05-0.1 mm. alto. Corymbs with central cluster subsessile, the 2 lateral clusters with 6 or more spikelets; bract shorter or longer than corymbs, 1-1.6 cm. long, scabridulous on margins; lower scales 0.5-1.5 mm. long, the upper 2.25-3.5 mm. long; style divided into 2 slender branches; achene somewhat narrowed below, rounded or subrruncate above, tawny-brown, each face deeply 4-5 transversely sulcate with prominent suba cutely angled ridges with fine striae running lengthwise between the ridges, narrowly ridged lengthwise on each side (Fig. 5, e, f). Type in herb. Chi. Nat. Hist. Mus., collected in vicinity of Sanariapo, near Rio Sanariapo, tributary of Orinoco river, Territorio Federal Amazonas, alt. 100 m., September 8, 1944, Julian A. Steyermark 58469. Also collected among rock outcrops below mouth of Rio Sanariapo, along Orinoco river, alt. 100 m., September 8, 1944, Steyermark 58436. Related to R. pluricarpa Gilg of the Matto Grosso-Parana' portion of Brazil, but differs in its larger, oblong achene of different color, prominent sulcations and ridges, and in the single fruit of the spikelets instead of 4-5. From R. tenuis it is distinguished by the oblong, instead of subglobose or turbinate, achene with more prominent sulcations, narrower and less prominent tubercle, shorter spikelets, and shorter culms, leaves, and bracts, while from R. lenella it is separated by the shape of the achene, absence of the long scabrous awn of the scales, and denser clusters of spikelets. Rhynchospora sororopana Steyermark, sp. nov. Perennis caespitosa; culmis tenuibus foliatis, 15-50 cm. altis,
BOTANICAL EXPLORATION IN VENEZUELA - I 47 0.2-0.5 mm. latis, plerumque quam foliis excedentibus; foliis 15-25 cm. longis, 1.5 mm. latis; fasciculis 3-7, confertis racemoso-subcapitatis, 6-8 mm. longis, 3-4 mm. latis, axillaribus terminalibusque; pedunculis tenuibus, 0.5-5 cm. longis; bracteis setaceis, 2-7.5 cm. longis, 0.5-1 mm. latis; spiculis ovato-lanceolatis, 3.5-4 mm. longis, 1-carpis; squamis ovatis vel ovato-lanceolatis, aristatis vel acuminatis, pallidis; setis nullis; achaenio elliptico-ovoideo, basi angustato, superne nonnihil angustato, 2 mm. longo, 1.2 mm. lato, subtilissime puncticulato; tuberculo conico, 1 mm. longo; stylo breviter diviso, ramis brevibus. Culms glabrous; leaves glabrous, several; fascicles of the inflorescence scattered along the middle and upper portion of the culms; spikelets with 4 scales; scales pale buff or grayish-green to greenishstramineous; achene greenish or pale stramineous, minutely puncticulate with cells slightly higher than broad; beak about half the width of the achene. Type in herb. Chi. Nat. Hist. Mus., collected^ along Quebrada Sororopan, between Santa Teresita de Kavanaye'n and Rio Tek- Yunsen, state of Bolivar, alt. 1375 m., December 3, 1944, Julian A, Steyermark 60831. A member of Series Diplostyleae, Div. Psilocarya, Sect. Paucinucigerae (following Clarke's divisions), this is related to R. biflora, R. brevirostris, R longispicata, and R. nardiflora. It is distinguished by its pale greenish, gray-green, or greenish-white spikelets, small inflorescences, width of leaves, and details of achene andbeak. Rhynochospora tamana Steyermark, sp. nov. Perennis caespitosa; culmis glabris, 7-55 cm. altis, 1.5-2 mm. latis; foliis plerumque basilaribus, linearibus, rigidis, supra paullo scabridulis, marginibus scabris, 7-30 cm. longis, 3-3.5 mm. latis; paniculis plus minusve 4, anguste ellipsoidalibus contractis, 3-3.5 cm. longis, 0.7-1.2 cm. latis, axillaribus terminalibusque; rhachibus angulatis, angulis scabris; pedunculis tenuibus, glabris, angulatis, 4-13 cm. longis; bracteis 8-13 cm. longis, 2-3 mm. latis; vaginis bractearura nitidis, fulvo-brunneis; spiculis confertis, fusiformibus, 9-10 mm. longis, 1.5-2 mm. latis, subsessilibus vel breviter pedicellatis, 2-carpis; squamis ovatis vel lanceolatis, breve aristatis, 4-9.5 mm. longis, castaneis; setis 6, antrorse hispidulis, tuberculum excedentibus, 8-8.5 mm. longis; achaenio fusiformi-elliptico, basi manifeste stipitato, 3.5 mm. longo, 1 mm. lato, subtilissime puncticulato; tuberculo conico-subulato, quam achaenio paullo breviore, 1.5-2 mm. longo, basi parce hispidulo; stylo bifido, ramis 3 mm. longis, stylo brevioribus. Culms leafy below, exceeding the leaves; lower leaf surface covered with gray-white stomata between the raised nerves; bracts somewhat foliaceous; spikelets with 5 scales; achene stramineous
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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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