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48 FIELDIANA: BOTANY, VOLUME 28 minutely puncticulate with numerous narrow reticulations much higher than broad (Fig. 6, d). Type in herb. Chi. Nat. Hist. Mus., collected on limestone outcrops of Pa'ramo de Tama', near Colombian-Venezuelan boundary, state of Tachira, alt. 3045-3475 m., July 15, 1944, Julian A. Steyermark 57404. Also collected in same locality, Steyermark 57398. Related to ft. macrochaeta Steud., from which it differs in the more elongated achene which is stipitate-based, shorter narrower panicles, longer scales and spikelets, narrower, more rigid, and more scabrid leaves, and the generally smaller stature. Rhynchospora tepuiana Steyermark, sp. nov. Perennis caespitosa; culrais setaceis foliatis, 10-25 cm. altis, 0.5 mm. latis; foliis setaceis, glabris, 8-13 cm. longis, 0.2-0.3 mm. lads; vaginis membranaceis, glabris, quam laminis latioribus, ore subtruncato; inflores centia corymbosa vel subcorymbosa, 6-10 mm. alta, 5-8 mm. lata; bracteis 2.5 cm. longis, quam inflorescentia longioribus; spiculis 2-10, anguste ellipticis, 3-4 mm. longis, 5-floris, 5-carpis vel paucioribus; squamis late ovatis, mucronatis, 1.6-2.7 mm. longis, castaneis; setis 1-6 vel nullis, rudimentariis , antrorse serrulatis, 0.5-0.9 mm. longis; achaenio elliptico-obovoideo, substipitato, lenticulari, 1.5 mm. longo, 0.6-0.7 mm. lato, breviter trans versim ruguloso, inter rugas leviter reticulato-puncticulato; tuberculo deltoideo; stylo profunde diviso, ramis longis. Orifice of sheath with 2 lateral processes; bracts setaceous; spikelets about 1 mm. wide, with 9 scales; scales mucronate or short-awned, the lowest 2 empty scales 1.6-1.8 mm. long, the others 2.5-2.7 mm. long; bristles ferruginous-brown; achene abruptly narrowed and substipitate at base, gradually narrowed above, pale buff or stramineous, pilosulous at summit just below tubercle, shallowly cross-wrinkled with rows in between the wrinkles of faint puncticulations higher than broad, the cells in the lower fourth longer, broader, and nearly as broad as high; tubercle inconspicuous, deltoid or conic, about half the width of achene, pale brown; branches of style much longer than the style proper (Fig. 5, Type in herb. Chi. Nat. Hist. Mus., collected on forested southwest-facing quebrada near Rondo'n Camp, Mount Roraima, state of Bolivar, alt. 2040 m., September 25, 1944, Julian A. Steyermark 58652. Also collected on rocky hematite exposures on open slopes on summit at west end of Sororopan-tepui', alt. 2225-2255 m., November 13, 1944, Steyermark 60061. This species is related to /?. Sellowiana Steud., 1855, not R. Sellowiana Boeckl., 1873, to R. Gollmeri Boeckl., and to R. roraimae Kuk. From R. Sellowiana Steud, it differs in its castaneous, not stramineous spikelets with much shorter setae. From R. Gollmeri of the Caracas and Cordillera de la Costa area, it differs in the shorter spikelets, long-cleft style, shorter tubercle of achene, much shorter g).
BOTANICAL EXPLORATION IN VENEZUELA - I 49 bristles, and more conspicuously rugulose or reticulate instead of almost smooth achene. From P. roraimae it differs in the greater number of spikelets, longer, less rigid culms and leaves, shorter tubercle, presence of setae, and more rugulose-reticulate achene. Rhynchospora tomentosa Steyermark, sp. nov. Perennis; culmis foliatis, 7.5 dm. altis; foliis basilaribus et culmis subcoriaceis, rigidis, undique velutino-tomentosis, 25-30 cm. longis, 9-10.5 mm. latis; paniculis 5-6, oblongo-lanceolatis, densifloris, 4-4.5 cm. longis, 1.3-1.5 cm. latis, axillaribus terminalibusque; rhachibus hispidulis; pedunculis 1.5-6 cm. longis, tomentosis; bracteis foliaceis, paniculas excedentibus, 6.5-12 cm. longis, 3-6.5 mm. latis, adpresso-villosulis infra praesertim; vaginis bractearum foliorumque velutino-tomentosis vel tomentosis; spiculis confertis anguste lanceolatis vel fusiformi-ellipticis, 5-5.5 mm. longis, 1.5 mm. latis, breviter pedicellatis, 1-carpis; squamis ovatis vel ovato-oblongis manifeste aristatis, 2-4.5 mm. longis, fuscocastaneis, arista 1-10 mm. longa, hispid ula; setis 2-3, antrorse hispidulis, achaenio longioribus; achaenio oblongo-obovoideo, biconvexo, 1.8 mm. longo, 1 mm. lato, subtilissime transversim lineolato; tuberculo conico, 1 mm. longo; stylo parce diviso. Lower side of leaves especially velutinous-tomentose, deeply sulcate or canaliculate above, midrib prominent below; panicles erect; lower spikelet scales 2-2.5 mm. long, with an awn 1-1.25 mm. long, the upper 3.5-4.5 mm. long with awns 9-10 mm. long; achene stramineous, finely transversely lineolate with many vertical rows, the lineolations broader than high; tubercle 3/4 width of achene (Fig. 6, e-h). Type in herb. Chi. Nat. Hist. Mus., collected on limestone outcrops of Paramo de Tama, near Colombian-Venezuelan boundary, state of Tachira, alt. 3045-3475 m., July 15, 1944, Julian A. Steyermark 57391. This unusual species. is well-marked by its velutinous-tomentose leaves, bracts, and sheaths, and conspicuously aristate scales. It is related to R. macrochaeta Steud. Rhynchospora Trichochaeta C. B. Clarke, var. venezuelensis Steyermark, var. nov. A typo differt bracteis quam capitulo longioribus, 6-15 mm. longis, marginibus breviter ciliato-pilosis; tuberculo longiore angustioreque acutiore, pilis scabris longioribus. Achene dark brown or blackish-brown (Fig. 5, h ). Type in herb. Chi. Nat. Hist. Mus., collected on rocky savanna slopes between Ciudad Bolivar and Rio Carom, state of Bolivar, alt. 100 m., August 1, 1944, Julian A. Steyermark 57587.
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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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