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170 FIELDIANA: BOTANY, VOLUME 28 POGONIA trijlfora (3. o c fiure i nji. FIGURE 26 Pogonia triflora. 1, Plant (X 4/5>, 2. Flower from the side (X 2); 3, Dorsal sepal (X 2); 4, Petal (X 2>, 5, Lateral sepal (X 2>, 6, Lip, from above (X 2).
BOTANICAL EXPLORATION IN VENEZUELA - I 171 This species appears to be similar to Pogonia tenuis Reichb. f., but differs in having longer floral bracts, larger rose-colored (not white) flowers and acute (not acuminate) sepals. It seems to be allied to P. elegantula Schltr., but has much smaller, narrower leaves. Pogonia unifoliata C. Schweinfurth, sp. nov. Herba terrestris, minor. Caulis gracilis, ima basi dense villosus, supra glaber, unifoliatus. Folium anguste ellipticura, acutum, sessile, amplectens, erectum. Flos singulus, bracteatus. Sepala lanceolato-oblonga, acuta, tubulari-involuta. Petala ellipticooblonga, paulo breviora, tenuiora. Labellum ezpansum oblongoellipticum, prope apicem profunde trilobatum; lobi laterales involuti, cum apice libero brevi rotundato vel obtuso; lobus medius comparate parvus, in circuitu natural! triangularis, ezpansus suborbiculariobovatus; discus basi minute bicallosus, fascia mediana late percursus. Columna brevis, supra sensim dilatata. Plant terrestrial, rather small. Stem slender, up to about 20 cm. long, densely brown-villous at the base (doubtless where in contact with the soil), glabrous above, blue-gray and glaucous, furnished in the lower third with a minute ovate-lanceolate amplexicaul sheath and in the upper third with a single leaf. Leaf erect, narrowly elliptic, acute, sessile, amplexicaul, blue-gray, glaucous, about 2.8 cm. long and 8 mm. wide. Inflorescence 1-flowered, leafy bracted. Bract similar to the leaf, ovate-elliptic, amplexicaul, acute, deeply concave and clasping the flower, about 2.5 cm. long, with the tip little shorter than the floral segments. Ovary slender, plurisulcate, glabrous. Flower small, apparently a bud. Sepals parallel, fleshy, pale yellow-green, glaucous, tubular-involute. Dorsal sepal lanceolate-oblong, acute, 7 -nerved, about 14.5 mm. long and 4 mm. wide when expanded. Lateral sepals similar, slightly shorter and narrower, slightly oblique, 5-nerved. Petals elliptic-oblong, acute or subacute, about 13 mm. long and 4 mm. wide, thinner than the sepals, pale green, 3-nerved through the middle with lateral nerves branching. Lip oblong-elliptic in natural poskion, deeply 3-lobed near the apex, about 12.5 mm. long and 5.8 mm. wide when expanded, pale greenish white with purple lines; lateral lobes inrolled with short rounded or obtuse free apex; mid-lobe very small, triangular in natural position with involute sides, when expanded suborbicularobovate with crenate margins; disc through the middle with a broad fleshy band (longitudinally divided above) extending from near the base about to the middle of the mid-lobe, minutely bicallose at the base. Column short, gradually dilated upward, white at base with wine-purple near tip, about 7.1 mm. tall at the back including the large erect anther (Fig. 27). Type in herb. Chi. Nat. Hist. Mus., no. 1203948, scrubby forest on rocky open portion of plateau on southeast-facing slopes, Ptari-tepui, state of Bolivar, alt. 1600 m., November 1, 1944, Julian A. Steyermark 59630.
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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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