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166 FIELDIANA: BOTANY, VOLUME 28 species. It is intermediate between 5. capitata (Walt.) Mart, forma brae te os a (Gleason) Jonk. and H. dasyantha. FIGURE 24 Burmannia sanariapoana Steyermark A, Portion of inflorescence (X 5); B, Flower and bracts (X 5); C, One of inner and outer perianth lobes from within, and attached stamen (X 18>, D, Outer perianth lobe with crest, lateral view (X 18); E, Stamen (highly magnified); F, Upper part of style with stigmas (highly magnified).
BOTANICAL EXPLORATION IN VENEZUELA - I 167 ORCHIDACEAE 1 2 Pogonia stricta C. Schweinfurth, sp. nov. Herba terrestris, gracilis. Caulis sparsim ramosus, cum ramis strictis paucifloris, sine foliis sed minute bracteatus. Racemi bi-vel quadriflori. Flores lateraliter visi arcuati. Sepala carnosa. Sepalum dorsale fomicacum, longitudinaliter concavum, lanceolateoblongum. Sepala lateralia arcuato-falcata, caetera similia. Petala elliptic o-oblonga, leviter falcata, quam sepala paulo breviora sed latiora. Labellum tubulari-involutum, simplex, lance olato-oblongum, obtusum; discus basi minute bicallosum, cum fascia lata carnosa minute multipapillosa per medium. Columna apice dilatala, ala conspicua term in a ta. Plant terrestrial, very slender, at least 23 cm. high (up to the apex of the raceme) in the only complete plant present. Stem with 1 to several strict and more or less remote branches, produced below into an irregularly flexuous villous portion, leafless, provided remotely with minute appressed, triangular-ovate and acute or narrowly triangular-lanceolate and acuminate bracts which are 10 mm. or less long; branches short, 2- to 4-flowered, rarely up to 7.8 cm. long. Floral bracts strict, triangular-ovate, deeply concave, acuminate. Flowers small, narrowly campanulate and arcuate when seen from the side in natural position. Sepals fleshy, longitudinally concave, greenish yellow. Dorsal sepal fornicate, lanceolate-oblong, acute, apiculate, up to about 20 mm. long and 4 mm. wide when expanded, dorsally lightly carinate. Lateral sepals oblique and falcate, lanceolate-oblong, acute, about 20 mm. long and 4.8 mm. wide, dorsally carinate. Petals similar to the lateral sepals, ellipticoblong, falcate, acute, up to 18 mm. long and 5 mm. wide, 3-nerved (or 5-nerved in the middle), with minutely irregular margins, creamy yellow. Lip tubular-involute in natural position, simple, lanceolateoblong, obtuse, up to about 16.3 mm. long and 6.2 mm. wide below when expanded, with the lateral margins toward the apex minutely erose and crisped-undulate; disc minutely bicallose at base, with a broad central oblong-lanceolate acuminate fleshy band (entirely covered by crowded papillose keels) extending from the base nearly to the apex. Column small, from a slender base rather abruptly dilated above, terminating in a prominent triangular blunt wing which is lacerate on each side below, about 8 mm. or less high at the back (Fig. 25). Type in herb. Chi. Nat. Hist. Mus., no. 1203783, isotype in Herb. Ames, no. 64865, Brocchinia-Stegolepis-Heliamphora swamp on southwest-facing shoulder, Ptari-tepui, state of Bolivar, alt. 2200 m., November 2, 1944, Julian A. Steyermark 59786, "lateral sepals with pale greenish in center, lip creamy white with rose-lavender or magenta". 1 2 By Charles Schweinfurth
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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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