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98 FIELDIANA: BOTANY, VOLUME 28 Lamina of leaf deep green above, glaucous-silvery below. Type in herb. Chi. Nat. Hist. Mus., collected in dwarf wet woods, lower southeastern slopes of Carrao-tepui, state of Bolivar, December 5-6, 1944, Julian A. Steyermark 60863. Another collection, with more juvenile foliage, is same locality, Steyermark 60864. This species, its leaves with numerous, closely spaced, subeqttal nerves, is related to P. duidae Steyerm., described above, from which it differs in the glaucous-silvery lower leaf surface of the blades, which in a mature stage (Steyermark 60863) have the postical lobes divided all the way to the petiole. In juvenile leaves (Steyermark 60864) a subpeltate condition is found. In addition, the blades are relatively narrower, being ovate-oblong instead of ovate-sub-, orbicular, as in P duidae, and more abruptly acuminate at apex. Philodendron Krauseanum Steyermark, sp. nov. Caudex scandens, teres, internodiis superioribus 8-12 mm. longis; foliorum petiolo 6-11 cm. longo, vagina persistenti latiuscula, ad 17 mm. lata. apice obtusa, laminae basin haud attingenti instructo; lamina coriacea, oblongo-elliptica, apice cuspidato-acuminata, basi obtusa vel rotundata, 15-22 cm. longa, 6-8 cm. lata, nervis primariis utrinque 8, supra conspicuoribus arcuatim adscendentibus; pedunculo ca. 3.5 cm. longo; spatha extus viridi, 11-12.5 cm. longa, tubo ovoideo-oblongo, 2.5-3 cm. lato, quam lamina oblonga apice abrupte cuspidata paullum breviore; spadice cylindrico sursum paullum attenuate obtuso quam spatha breviore vel longiore, 10.5-16.5 cm. longo, 1-1.5 cm. crasso; inflorescentia foeminea, 5-7.5 cm. longa, ca. 1.5 cm. crassa; pistillo prismatico, 5 mm. longo, plerumque 4-loculari, ovulis pro loculo numerosissimis biseriatis, stigmate majusculo rotundato corona to; inflorescentia mascula 8-9 cm. longa, 1 cm. crassa; floribus masculis prismaticis. Leaf sheath broad on both sides of petiole and extending to within 7-8 mm. of junction with blade and petiole, slightly produced beyond the insertion; leaf blades deep or rich green above, dull paler green below, midnerve prominent, especially below, 1.5 mm. wide, the 8 primary nerves on each side on lower surface of blade much more conspicuous than the fine, closely spaced, arcuate-ascending secondary and tertiary nerves. Type in herb. Chi. Nat. Hist. Mus., collected in lower portion of Quebrada O-paru-ma', tributary of Rib Pacairao, below Santa Tereska de Kavanayen, state of Bolivar, alt. 915-1065 m., November 25, 1944, Julian A. Steyermark 60567. Also collected along wooded quebrada, Gran Sabana, between waterfall at Rue'-meru (tributary of Rio Kukena'n) and Divina Pastora on Rio Kukenan north of Santa Elena, south of Mount Roraima, state of Bolivar, alt. 1065 m., October 3, 1944, Steyermark 59276. In the broad petiolar sheath this species approaches P. lingulatum (L.) C. Koch of the West Indies, but that has the leaf blades more
BOTANICAL EXPLORATION IN VENEZUELA - I 99 obtuse at base and a narrower petiolar sheath. In P. lingulatum the leaf blade is ovate, whereas in P. Krauseanum it is oblong-elliptic. Philodendron ptarianum Steyermark, sp. nov. Planta terrestris, caudice epigaeo, internodiis brevibus; cataphyllis lanceolatis, 24 cm. long is; foliorum petiolo verrucoso, supra 2-angulato, dorsaliter convexo, 6-7 cm. longo, 3.5-4.5 mm. crasso; lamina erecta coriacea, supra nitida, lanceolata, apice breviter cuspidata, basi obtusa, 23-25 cm. longa, 4.6-5.1 cm. lata, paullo inaequilaterali, costa media crassissima, supra verrucosa, basi 3-4 mm. lata, nervis lateralibus numerosissimis densissimis, omnibus subaequalibus parallelis, 1-1.25 mm. remotis, leviter arcuatim adscendentibus. Petiole verrucose, 2-angled above, convex below, leaf blade erect, dark green and shining above, yellow green below, midnerve above verrucose, pale green. Type in herb. Chi. Nat. Hist. Mus., collected on dry, sandy and rocky sandstone exposures on level ground adjacent to swamp on plateau-portion of southeast-facing slopes, Ptari-tepui, state of Bolivar, alt. 1600 m., November 1, 1944, Julian A. Steyermark 59682. Apparently a member of sect. Baursia, and although in sterile condition, this species is well-marked by its distinctive vegetative characters of verrucose petiole and upper surface of midrib, as well as by the relatively small lanceolate leaf blades, which are shining on the upper surface, and by the elongated petioles. It is related to P macro gloss urn Schott, P, stenophyllum Krause, P* calophyllum Brongn., and P. insigne Schott. Philonotion Williams!! Steyermark, sp. nov. Planta herbacea; foliorum petiolo 6-7 cm. longo; vagina 3.5-5 longa, 5-8 mm. lata, inferne dilatata; lamina anguste lanceolata, apice 8-10 mm. longe filiformi-caudata, basi obtusa repentino contracta, 6-12 cm. longa, 13-15 mm. lata, nervis lateralibus numerosis subaequalibus tenuibus valde adscendentibus; pedunculo cataphyllo longo vaginante, subtus incluso, 19 cm. longo, 2-4 mm. lato; spatha 8 cm. longa, fauce 3.5 cm. longa, 1.5 cm. ampla, lamina cylindrica vel anguste cyrabiformi, 4 cm. longa, 8 mm. lata, cuspide 8 mm. longa instructa; spadice 7 cm. longo; inflorescentia foeminea 1.5 cm. longa, 5 mm. crassa, sursum attenuata; pistillo 1.6 mm. longo, ovario elliptico-oblongo uniloculari, ovulo unico funiculo longo infra medium parietis lateraliter affixo, stigmate hemispherico-discoideo; inflorescentia mascula sterili 2-2.5 cm. longa, inferne 4 mm. crassa, mascula fertili subfusiformi, 3.5 cm. longa, medio 4.5 mm. crassa. Petiolar sheath 1/2-3/4 length of petiole, obtuse at apex; lamina of leaf narrowly lanceolate, abruptly tipped with a filiform-caudate appendage 8-10 mm. long, midnerve somewhat prominent below, broadened near base to 1.5-2 mm. wide, the lateral nerves faint or cm.
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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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