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82 FIELDIANA: BOTANY, VOLUME 28 Dahlgrenia Steyermark, gen. nov. Monoeca, spadicibus distinctis unisezualibus. Spadis utriusque sexus ramosus, ramis masculinis tenuibus. Flores masculi minutuli: calyx parvus, sepalls 3 imbricatis late subrhoraboideo-subglobosis; corolla petalis 3 valvatis liberis non patentibus basi non-dilatatis nee gibbosis oblongis; sta minibus 6. Flores foeminei parvi: calyx sepalis 3 imbricatis suborbicularibus; corolla petalis 3 valvatis late ovatis; staminodia 6 ad basim ovarii adhaerentibus; ovario integro glabro, loculis 3, ovulo in loculo solitario, stigmatibus apicalibus. Palmae inermes, frondibus paripinnatis. Pinnae apice praemorsae et erosae. Type species: Dahlgrenia ptariana Steyermark. This genus is dedicated to and named in honor of Dr. B. E. Dahlgren, Curator Emeritus of the Department of Botany at the Chicago Natural History Museum. Students of palms owe Dr. Dahlgren a debt of gratitude for his contributions to the study of tropical American palms, for the excellent series of palm exhibits and palm herbarium which he has organized and developed at the Museum, and especially for his monumental work "Index of American Palms" published in 1936. Dahlgrenia ptariana Steyermark, sp. nov. Caudex 11-14 m. altus, 9.5-10 cm. crassus, solitarius; frondibus 2.2 m. longis 4-seriatis subcoriaceis supra viridibus infra argillaceis lineis latis fuscis ad margines exteriores et squamis fuscis sessilibus microscopic is obtectis; rhachi usque ad 4.5 cm. lata tomentosa cinereo-fusca praedita supra carinata infra convexa; pinnis utroque latere 28 valide sulcatis, pinna terminali cuneata praemorsa 50 cm. longa, ceteris angustate ligulatis apice oblique praemorsis et erosis, 86-115 cm. longis, 7 cm. latis, infra usque ad 16 nervis, lineo lato marginali 4-8 mm. lato; spathis elongatis; spadice masculina alba ramis numerosis tenuibus 9-12 cm. longis, 2 mm. eras sis, glabris; floribus masculinis confertis glabris; sepalis supra rotundatis 0.5 mm. altis, 0.7-0.8 mm. latis, petalis ovatis vel elliptico-oblongis, 0.7 mm. longis, 0.5 mm. latis, obtusis; antheris sessilibus vel fere 0.5-0.6 mm. longis; spadice foeminea alba tomentella pilis brevibus albidis, rhachi 60 cm. longa, 1-2.5 cm. crassa, ramis numerosis 60 cm. longis, 2 mm. crassis; bracteis late ovatis acutis vel acuminatis, 2.5-3 cm. longis, basi 2 cm. latis, extus fulvo-tomentosis, intus basi nigris; sepalis rotundatis 1.5 mm. altis, 2.5 mm. latis ad margines ciliatis; petalis obtusis 2 mm. latis, 2 mm. altis, striatis; staminodiis 0.2 mm. longis dentiformibus; ovario 1.2 mm. longo. Fronds 4-ranked; rachis covered with a fine dull gray-brown tomentum which wears off in age, but persists in places as a dark brown tomentum; pinnae subcoriaceous, deep rich green above, silvery below with a broad, dark brown, tomentose band extending along outer margin on lower surface of each segment, sometimes
BOTANICAL EXPLORATION IN VENEZUELA - I 83 FIGURE 11 Dahlgrenia ptariana Steyerraark A, Leaf segment from lower portion of frond (X 1/7); B, Terminal portion of frond (X 1/5); C, Pistillate flower, from above (X 5.5); D, Pistillate sepal (X 5.5); E, Pistillate petal (X 6); F, Pistil (X 10); G, Pistil, from above (X 10>, H, Staminate sepal (X 9); I, Staminate petal (X 5); J, Stamen (X 10>.
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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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