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172 FIELDIANA: BOTANY, VOLUME 28 POGONIA if n iAo fia ta & FIGURE 27 Pogonia unifoliata. 1, Plant (X 4/5); 2, Flower from the side (X 3>, 3, Dorsal sepal (X 4); 4, Petal (X 4); 5, Lateral sepal (X 4); 6, -Lip, from above (X 4).
BOTANICAL EXPLORATION IN VENEZUELA - I 173 This species does not appear to have any near ally, but it recalls a small form of the North American Pogonia ophio gloss aides (L.) Ker-Gawl. Prescottia carnosa C. Schweinfurth, sp. nov. Herba terrestris, stricta; pro genere mediocris. Folia tria, basalia, prominenter petiolata; lamina ovata, acuta, basi rotundata vel subtruncata, valde coriacea. Scapus glaber, remote multivaginatus. Raceraus subdense multiflorus. F lores parvi. Sepala petalaque revoluto-circinnata. Sepala similia, oblonga vel triangulari-oblonga, apice abrupte rotundata, lateralia paulo majora et in saccum ovario adnatum basi producta. Petala linearia, apice abrupte rotundata. Labellum erectum, multo majus, subgloboso-concavum, valde carnosum, intus medio unicarinatum, basi utrinque in auriculam adnatam eztensum. Columna abbreviata. Plant terrestrial, strict, medium-sized for the genus, about 50.5 cm. high. Roots fascicled, tuberous, densely lanuginose. Stem up to the inflorescence glabrous, about 41.5 cm. long, rose-red, provided with many (about 13) sheaths which are relatively short imbricating and coriaceous at base, scarious longer and remote in the middle, and scarious and very short above. Leaves 3, entirely basal (i.e. rosulate), long-petioied; lamina ovate, acute, abruptly rounded to subtruncate at base, with the margins entire but often appearing erose-crenulate in the dried specimen, coriaceous, deep green above, silvery beneath with rose-red mid-rib, about 4.7 cm. long and 3 cm. wide; petioles fleshy and deeply sulcate, abruptly dilated above, rose-red, about 5.5-6.5 cm. long. Inflorescence subdensely manyflowered, looser below; rachis 8.5 cm. long, rose-red. Floral bracts ovate, long-acuminate, scarious, shorter than the ovary. Flowers very small, non-res up inate (i.e. with lip uppermost), tawny-yellow and salmon, sepals and petals submembranaceous and recurvedcircinnate, lip fleshy. Dorsal sepal oblong or lanceolate-oblong, abruptly rounded at the apex, 1-nerved, about 3 mm. long and 1.2 mm. wide below when expanded. Lateral sepals triangular-oblong, forming at base a sac adnate to the ovary; free part similar to the dorsal sepal, shortly connate on the inner margins, about 3*5 mm. long and nearly 2 mm. wide below. Petals linear, abruptly rounded at the apex, 1-nerved, about 2.6 mm. long and 0.9 mm. wide. Lip relatively large, subglobose-concave, tapering on each side below into a long auricle which is mostly adnate to the sepaline wall but free at the apex, very fleshy, about 7-nerved, divided in the middle by a prominent but short longitudinal keel, glabrous within but densely minutepapillose on the outer surface. Column abbreviated, very stout (Fig. 28). Type in herb. Chi. Nat. Hist. Mus., no. 1203753, Brocchinia- Stegolepis-Heliamphora swamp on southwest-facing shoulder, Ptaritepui, state of Bolivar, alt. 2200 m., November 2, 1944, Julian A. Steyermark 59772.
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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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