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196 FIELDIANA: BOTANY, VOLUME 28 acutum. Sepala lateralia falcato-oblonga, acuta. Petala oblanceolato-linearia, acuta. Labellum in partes duas divisum; pars basalis columnae parallela, tubulari-concava, expansa elliptica; pars anterior leviter convexa, ovato-subquadrata, apice profunde bilobata. Columna conspicua, in pedem sensim producta. Plant epiphytic, sprawling. Stems irregularly much branched, slender, bearing pseudobulbs at more or less remote intervals, producing scattered fibrous, filiform, glabrous roots mostly beneath or in the vicinity of the pseudobulbs or among the remote strobiliform clusters of leaves on the younger parts; stem-members adorned with several short infundibuliform sheaths which are more or less distant and evanescent in age, up to 9.3 cm. long in our specimens. Pseudobulbs well-developed only on the older portions of the plant, narrowly ovoid to ellipsoid, unifoliate at the apex, about 1.5 cm. or less long and apparently surmounting abbreviated stems which are enveloped by several pairs of closely imbricating evanescent leafbearing sheaths. Upper portions of the stems producing short strobiliform clusters of several distichous, closely imbricating leafbearing sheaths. Leaves small, apparently fleshy, variable in size and shape, elliptic to oblong or linear, subacute to abruptly rounded with a minutely tridenticulate more or less oblique apex, up to 4.6 cm. long, 3.5-8.5 mm. wide, sessile at the narrowed complicate base. Inflorescences abbreviated, 1-flowered, in the axils of leaf-bearing sheaths on the younger portions of the plant. Flowers very small on relatively elongate pedicels, with subfleshy segments. Sepals pale greenish yellow. Dorsal sepal elliptic-oblong, acute, 3 -nerved, about 7 mm. long and 3 mm. wide. Lateral sepals obliquely oblong, lightly falcate, acute, 3-nerved or obscurely 5-nerved, about 7 mm. long and 3 mm. wide. Petals oblanceolate-linear, acute, 3-nerved, about 6 mm. long and 1.3 mm. wide, maroon-purple or wine purple-red. Lip about as long as the other segments, with the lower half erect and parallel to the column and the anterior half recurved in natural position, pale yellow with dull lavender spots on anterior lobe; lower portion tubular-concave, broadly elliptic when expanded, minutely erose in front and extending onto the anterior portion; anterior portion lightly convex, ovate-subquadrate, deeply bilobed with overlapping lobules, the lateral margins slightly constricted above the middle and irregularly denticulate, provided with a conical tubercle beneath the apical indentation. Column prominent, arcuate, slightly dilated above, cream-colored, about 4 mm. high at the back, extended gradually into a conspicuous foot (Fig. 38). Type in Herb. Ames no. 64858, isotype Mus., no. 1206998, lower southeastern slopes of Carrao-tepuf, state of Bolivar, alt. 1675-1980 m., December 5-6, 1944, Julian A. Steyermark 60873, "on dead mossy log". in herb. Chi. Nat. Hist. There do not appear to be any near allies of this species. The specific name is in allusion to the short crowded branches.
BOTANICAL EXPLORATION IN VENEZUELA - I 197 Maxillaria patula C. Schweinfurth, sp. nov. Herba robusta, alticola, ramosa. Caules crassi, saepius ramosi, plusminusve remote pseudobulbiferi. Pseudobulbi ovoidei vel anguste pyriformes, saepissime unifoiiati, basi vaginis foliiferis distichis obtecti. Folia oblongo-elliptica vel oblonga, apice rotundata, basi conduplicata sessilia. Inflorescenciae abbreviatae, uniflorae, ex bractearum axillis exorientes. Flores parvi, carnosi, aurantiaci. Sepala similia, concava, ovata, vel oblongo-ovata, acuta vel acuminata. Petala late oblonga, acuta. Labellura erectum et columnae parallelum, leviter sigmoideum, prope apicem distincte trilobatum; lobi laterales erecto- incurvi, semiobovati; lobus terminalis parvus, ovato-rotandatus. Columna parva, antice complanata, infra incrassata. Plant robust, with sprawling stems. Stems stout, usually loosely branched, bearing pseudobulbs at varying intervals; stem-members between the pseudobulbs 2-10 cm. long, several-jointed, the older ones naked, the younger ones more or less entirely concealed by approximate or imbricating infundibuliform sheaths, bearing scattering fibrous glabrous roots mostly beneath or in the vicinity of the pseudobulbs. Pseudobulbs ovoid to narrowly pyriform, 1- or rarely 2-leaved at the apex, up to 3 cm. high, surrounded below by several (usually two or three) pairs of distichous imbricating leaf-bearing sheaths, the blades being successively larger upward. Leaves elliptic-oblong to oblong, rounded above with a somewhat unequally bilobed and apiculate tip, sessile with a cuneate conduplicate base, up to 7 (rarely 9.2) cm. long and 1.5 cm. wide, coriaceous. Inflorescences rising singly from the axils of the clustered bracts on the younger apical portions of the stems, abbreviated, 1-flowered. Flowers campanula te in natural position, fleshy, vermilion-orange with orange-yellow to golden lip and column. Dorsal sepal concave, ovate or oblong-ovate, acute (acuminate in natural position), about 10 mm. long and 5.6 mm. wide when expanded. Lateral sepals very similar but slightly longer and narrower than the dorsal sepal, lightly oblique. Petals broadly oblong, acute, about 7.2 mm. long and 3 mm. wide. Lip continuous with the column, upcurved and parallel to the column in natural position, very fleshy, lightly sigmoid, about 7.1 mm. long, sharply 3-lobed near the apex, oblong when viewed from above; lateral lobes erect-incurved, relatively elongate, semiobovate from a cuneate base, with a rounded free terminal portion; mid-lobe much smaller, ovate-rotundate , rounded above with a conical mucro beneath; disc with a broad central thickening extending from the base nearly to the apex of the upcurved lateral lobes. Column short, stout, about 4 mm. high at the back, with the lower portion gradually dilated into a short stout foot (Fig. 39)* Type in herb. Chi. Nat. Hist. Mus., no. 1206446, isotype in Herb. Ames no. 64859, between headwaters of Rio Colorado and summit of southern peak, Cerro Turumiquire, state of Sucre, alt. 2200-2400 m.,
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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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