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184 FIELDIANA: BOTANY, VOLUME 28 PLEUROTHALLIS C, Scfaveinjvrtfi P, fiumiKs C,Scfoveinf> FIGURE 33 Pleurothallis exilis. 1, Plant (X 2>, 2, Flower from the side, partially expanded (X 5); 3, Petal (X 5); 4, Lip, from the side and from above (X 8). Pleurothallis humilis. 5, Plant (X 2); 6, Flower from the side, partially expanded (X 5>, 7, Petal (X 8>, 8, Lip from above (X 12).
BOTANICAL EXPLORATION IN VENEZUELA - I 185 Pleurothallis humilis C. Schweinfurth, sp. nov. Herba perparva, caespitosa, epiphytica. Caules secundarii abbreviati, vaginis duabus imbricatis tubularibus obtecti. Folium singulum, erectum, oblanceolatum vel lineari-oblanceolatum, apice abrupte rotundatum, infra longe angustatum. Inflorescentiae filiformes, singulae vel tres, saepissime folia superantes, supra univel laxe triflorae. Flos parvus, tenuis. Sepalum dorsale valde concavum, anguste lanceolatum, acuminatum. Sepala lateralia similia sed angustiora, obliqua. Petala oblique linear!- lanceolata, longe acuminaca, sepalis paulo breviora. Labellum multo minus, in positu natural! oblanceolaco-oblongum, acutum, cum lobulis erectis breviter rotundato-rriangulis in parte inferiore. Columna crassa. Plant very small, epiphytic, caespitose. Roots fibrous, glabrous, as stout as the stems. Stems abbreviated, about 8 mm. or less long, entirely or very nearly enveloped by 2 tubular imbricating translucent sheaths. Leaf solitary, erect, oblanceolate or linear-oblanceolate, abruptly rounded above with a minutely tridenticulate tip, longnarrowed below, fleshy-coriaceous and rich green with purple spots in natural condition and revolute margins in the dried state, up to 18 mm. long and 3.5 mm. wide when expanded, the mid-nerve being sulcate above and sharply carinate beneath in the dried specimen. Inflorescences filiform, 1-3 near the summit of the stem, usually more or less surpassing the leaf, 1- or loosely 3-flowered above. Flower small but large for the plant, thin and translucent in the dried specimen. Sepals and petals dull salmon-orange. Dorsal sepal strongly concave, narrowly lanceolate, acuminate, 3-nerved, about 5 mm. long and 1.5 mm. wide when expanded. Lateral sepals similar to the dorsal sepal, obliquely and narrowly lanceolate, acuminate, shortly connate at the base, about 5 mm. long and 1 mm. wide. Petals obliquely linear- lanceolate, long-acuminate, 1-nerved, slightly shorter than the sepals, about 0.75 mm. side. Lip red, much smaller than the other segments, oblanceolate-oblong in natural position, acute, glabrous, with a pair of incurved triangular-rounded lateral lobules near the basal third, about 2.25 mm. long and 0.5 mm. wide above. Column stout, about 1.5 mm. long (Fig. 33). Type in herb. Chi. Nat. Hist. Mus., no. 1203736, epiphyte on tree on wooded slopes of Quebrada O-paru-ma, between Santa Teresita de Kavanaye'n and Rib Pacairao (tributary of Rib Mouak), state of Boh'var, alt. 1065-1220 m., November 20-21, 1944, Julian A. Steyermark 60383. This little plant has several apparent allies. It differs from Pleurothallis barbulata Lindl. in having much larger sepals and petals and an eciliate lip. It has petals which are markedly unlike those of P. pertenuis C. Schweinf. and P. sarcophylla Reichb. f. Pleurothallis Steyermarkii C. Schweinfurth, sp. nov. Herba terrestris, magna. Caules approximati, longi, apice unifoliati. Folium ellipticum, apice abrupte acuminatum, infra longe an-
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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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