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78 FIELDIANA: BOTANY, VOLUME 28 portion armed on both surfaces with flattened black spines 2-6 cm. long, 1 mm. wide, these more or less furfuraceous at or near the base, middle part of rachis with the lower convex side spinose with aggregations of black spines 1.5-3.5 cm. long, mixed at the base with small, slender, black or gray scales and (or) hairs, the upper carinate side without spines, the upper part of rachis with shorter black spines 0.4-1.1 cm. long on the lower surface mixed with short, blackbrown hairs and scales, spineless on the upper side, the uppermost part of rachis spineless on the lower side with only small clusters of blackish scales; spines at base of rachis on lower surface arranged in fan-like aggregations; pinnae 2-ranked, the uppermost ones with 6 primary nerves on each side, the lower and middle ones with 8-10 on each side, all the nerves on lower surface hispidulous with tiny brown appressed scales at base of hairs, lower pinnae 78-85 cm. long, 1.5-2 cm. wide, middle ones 75-85 cm. long, 2-3 cm. wide, uppermost ones 55-60 cm. long, 1-2 cm. wide, some pinnae sparsely and remotely setulose-ciliate, otherwise entirely unarmed; inflorescence erect, arising at base of leaf sheath; rachis creamy white; flowers yellow (Fig. 10). Type in herb., Chi. Nat. Hist. Mus., collected in forest near "Misia Kathy" camp, on southeast-facing slopes of Ptari-tepm, state of Bolivar, alt. 1585-1600 m., November 10-11, 1944, Julian A. Steyermark 60046. Also collected on lower southeastern slopes of Carrao-tepxu, state of Bolfvar, alt. 1675-1980 m., December 5-6, 1944, Steyermark 60869. Local name: "Moi-ye-kai-yek". This species shows a relationship to B, longisecta Burret, B. balanophora Spruce, B. littoralis Barb., B. glaucescens Drude, B. bidentula Spruce, B. megistocarpa Burret, B. setosa Mart., and B. vulgaris Barb., but differs from them by its combination of solitary trunk, dense fan-like clusters of long, black spines on lower surface of rachis and petiole, the long, black spines densely covering the spathe, the unarmed rachis of the inflorescence which is much branched and densely hirsutulous, the regularly many-pinnate frond with narrowly linear-lanceolate, concolorous pinnae which are densely hispidulous on the nerves of the lower surface, the glabrous fruit, and the minutely stipitate-glandular, otherwise glabrous, pistillate corolla. Bactris sororopanae Steyermark, sp. nov. Caudex 1.7-1.9 m. altus, 9-10 mm. crassus, solitarius, aculeis brevibus tenuibus nigris, 3-4 mm. longis; frondis vagina fuscotomentosa aculeis brevibus tenuibus 3-5 mm. longis apice fuscosetosa; lamina 25-27 cm. longa, 18 cm. lata; petiole 10-15 cm. longo, 3 mm. crasso, inermi ancipitali costato pallido-brunneo tomentosoleproso; rhachi fusco-leprosa 10-12 cm. longa; pinnis utrinque 5-6 irregulariter proxime dispositis alternatis vel suboppositis sigmoideis lanceolatis apice longi-acuminatis superne curvatis, 12-16 cm.
BOTANICAL EXPLORATION IN VENEZUELA - I 79 longis, 1.7-4.5 cm. lads, utrinque glabris vel infimis infra saepe fusco-leprosis ad margines prope apicem aculeis nigris tenuibus; spadice 3 cm. longa, in axillis, mox pendenti; rhachi unica et simplice glabra, floribus et fructibus spissis; spatha inermi 3-3.3 cm. longa furfuracea glabrescenti mox in partes longitudinales divisa; calyce quam corolla breviore persistenti, 3 lobis late ovatis apice rotundatis, 2.5 mm. longis, 2-2.5 mm. latis pluristriatis, extus glabra scariosa; corolla persistenti, 3 lobis ovato-suborbicularibus apice obtusis 3.5-4 mm. longis, 3.5-4 mm. latis, pluristriatis, extus glabra scariosa; drupa subgloboso-ovata, rostro brevi, glabra, 1 cm. longa, 9 mm. lata. FIGURE 10 Bactris ptariana Steyermark A, Portion of middle section of frond (X 1/3); B, Portion of trunk (X 1/3); C, Inflorescence with spathe (X 1/6); D, Fruit (X 4>, E, Pistillate flower (X 4); F, Pistillate corolla (X 4); G, Pistil (X 4); H, Staminate flower (X 4); I, Stamen (X 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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