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Croat T. B. & M. M. Mora, 2004, New Taxa of Araceae from Cabo 90 AROIDEANA, Vol. 27 New Taxa of Araceae from Cabo Corrlentes in Choc6 Department of Colombia Thomas B. Croat Missouri Botanical Garden Box 299, St. Louis, MO 63166 M. Marcela Mora Instituto de Ciencias Naturales Universidad Nacional de Colombia Apartado 7495, Bogota, Colombia ABSTRACT creeks and small rivers, resulting in an abrupt topography of hills and ravines New species of Araceae are described covered by scarcely disturbed Tropical wet from the Estacion Biological El Amargal forest (bmh-T). Annual precipitation was and vicinity on Cabo Corrientes in Choco about 7,924 mm for the period between Department of Colombia. These are An­ 1993 and 2001. thurium acutibacca Croat & M. Mora, A. amargalense Croat & M. Mora, A. aru­ Anthurium acutibacca Croat & M. Mora, siense Croat & M. Mora, A. debilis Croat & sp. nov. Type: COLOMBIA. Choco: Bay, A. eminens Schott, ssp. longispadix, Municipio Nuquf. Corregimiento Aru­ Croat & M. Mora, A. galeanoae Croat & M. sf. Estacion Biologica El Amargal, 0- Mora, A. grandicataphyllum Croat & M. 60 m, 5°34'N, 77°30'W, July-Sep. Mora, A. morae Croat, A. pallidicaudex 1998, M. Mora 39 (holotype, COL; Croat & M. Mora, A. promininerve Croat & isotypes, B, CUVC, HUA, K, MO, US). M. Mora, A. variilobum Croat & M. Mora, Figures 1-2. Monstera amargalensis Croat & M. Mora, Philodendron amargalense Croat & M. Planta epiphytica vel epipetrica; inter­ Mora, P. laticiferum Croat & M. Mora, P. nodia brevia, 0.9-3 cm diam.; cataphylla longipedunculatum, Croat & M. Mora, P. 3-13 cm longa; petiolus 9-46 cm longus; roseocataphyllum Croat & M. Mora, Rho­ lamina elliptica-lanceolata, 31-58 cm lon­ dospatha monsalvae Croat & Bay and ga, 6.5-13 cm lata; nervis primariis later­ Xanthosoma daguense Eng!. var. amar­ alibus 5-9 utroque; pedunculus 29-63 em galense Croat & M. Mora. longus; spatha 5-7 em longa, 7-10 mm lata, pallide viridis; spadix stipitatus 2 em INTRODUCTION longus, 6-7.5 cm, 1-1.2 em diam. ad bas­ im, 7-8 mm ad apex; bacca 9 mm longa, The species described here are the re­ rostrata. sult of a study made by the junior author in Colombia in a region along the Pacific Epiphyte or epipetric, stems with con­ coast in Central Choco Department cen­ spicuous indented petiole scars, 7-10 em tered at El Amargal Biological Station, lo­ long, 0.9-3 em diam.; internodes very cated 11 km north of Cabo Corrientes, (ca. short 0-3 mm), very light reddish to me­ 5°34'N, 7°31'W). The Cabo Corrientes area dium green, semiglossy, covered with a is adjacent to, and part of, a small penin­ dense mass of greenish roots; cataphylls sula at the southern end of the coastal Ser­ 3-13 cm long, semiglossy, obtusely 1- rania del Baudo. The peninsula is 15 km ribbed, becoming bluntly acute toward long and ca. 6 km wide, and it ranges in apex, persisting semi-intact as a reticulum elevation from sea level to about 120 m; of mostly longitudinal fibers, retained at its terrain is deeply dissected by numerous upper nodes then deciduous. LEAVES T. B CROAT, M. M. MORA, 2004 91 spreading; petioles (9)17-46 cm long, 4- 2-2.5 cm diam., tepals dark brown; ber­ 6 X 5-8 mm, subterete or U-shaped in ries ellipsoid, with a narrow conical beak cross-section, thicker than broad and nar­ at apex, 9 mm long (including the beak row and obtusely sulcate adaxially (some­ that is 3 mm long), 4 mm diam., bright red, times broadly and obtusely sulcate with translucent, with seeds visible; seeds 2. obtuse margins, these more acute toward Anthurium acutibacca is known only the apex), medium green, pale-speckled from Choco Department of Colombia in or dark short-lineate, semiglossy to matte; the Cabo Corrientes region in Tropical geniculum 1.1-3.2 cm long, yellow-green, moist forest Cbh-T) where it is sparse to sometimes tinged with red, sulcate like the moderately common, almost always found petiole; blades elliptic-Ianceolate to nar­ growing on trees at 1.5-15 m above the rowly elliptic, gradually and weakly acu­ ground, but occasionally found on rocks. minate at apex, acute to weakly attenuate The species is a member of Anthurium at base, 31-58 X 6.5-13 cm, broadest at or sect. Porphyrochitonium and is recog­ above the middle, subcoriaceous, dark nized by its elliptic-Ianceolate and glan­ green and weakly glossy to semiglossy dular-punctate blades that are acuminate above, paler and purplish brown glandu­ at apex and attenuated at base, and also lar-punctate below, weakly glossy to matte by its spreading inflorescence with below (in juvenile leaves the blade is promptly deciduous spathe and stipitate, glossy above), drying greenish to yellow­ and pinkish spadix with glossy tepals. green; midrib narrowly rounded on both Its ellipsoid and narrowly conical, bright surfaces (in broad valley above), ca. 2 mm red berries are acute before maturity wide at base and slightly paler than sur­ (hence the epithet acutibacca) distin­ face to concolorous above, moderately to guishing this species from the other mem­ conspicuously paler below; primary lat­ bers of A. sect. Porphyrochitonium in the eral veins 5-13 pairs, departing midrib at Cabo Corrientes region. 30-40°(-58°) angle, straight to weakly ar­ cuate, etched-sunken and concolorous Paratypes-COLOMBIA. Choco: Muni­ above, weakly raised and concolorous be­ cipio Nuqui, Corregimiento Arusi, Estacion low; collective vein prominently raised be­ Biologica EI Amargal, 5°34'N, 77°30'W, 0- low, 5-15 mm from margin, weakly loop­ 60 m, Jacome 384 (MO) , June 2000, M. connecting primary lateral veins; minor Mora & Croat 363 [Croat & Mora 83746] veins obscure. INFLORESCENCE spread­ (COL, MO), Mar.-Apr. 1995, Suarez et al. ing to erect-spreading; peduncle terete, 65 (COL), 483 (COL), 779 (COL), 896 26-63 cm long, 4-6 mm diam., ca. 2 times (COL); Galeano 3185 (COL); Quebrada longer than petioles, green to pinkish, Chaqui, 5°40'N, 77°16'w, ca. 200 m, Feb.­ pale-speckled to pale-lineate; spathe 5-7 Mar. 1994, Galeano et al. 4365 (COL). cm long, 7-10 mm wide, cuspidate at Anthurlum amargalense Croat & M. apex, spreading at anthesis and slightly Mora, sp. nov. Type: COLOMBIA. twisted, with margins prominently rolled Choco: Municipio Nuquf, Corregi­ under, subcoriaceous at anthesis, pale miento Arusi, Estacion Biol6gi. EI green, semiglossy outside, matte inside, Amargal, along Rio Arucisito, less deciduous; stipe 3.5-3.8 cm long in front than 10 m, 5°34'N, 77°30'W, 0-60 m, and 2-2.2 cm in back, semiglossy, medium 26 June 2000, M. Mora & Croat 385 green; spadix erect, more or less cylin­ (holotype, COL; isotypes, B, K, MO, drical, weakly tapered to apex, 6-7.5 cm US). Figures 3-4. long, (0.7)1-1.2 cm diam. at base, 6-8 mm at 1 cm from apex, bluntly rounded at Planta epiphytica; internodia brevia, 2.5 apex, dull medium pink to lavender; flow­ cm diam.; petiolus 14-20 cm longus, 12 ers 2 X 3 mm, ca. 7 visible in the principal mm diam.; lamina oblongo-obovata, 45- spiral, with glossy tepals. INFRUCTESC­ 57 cm longa, 19-23 cm lata; nervis pri­ ENCE pendent; spadix 11.5-15 cm long, mariis lateralibus 14-17 utroque; pedun- 92 AROlDEANA, Vol. 27 Figs. 1-4. -I, -2, (top L & R). Anthurium acutibacca Croat & M. Mora (M. Nlora & Croat 363). - 1 (top L). Habit o f fl owering plant. -2 (top R). Infructescence showing T. B CROAT, M. M. MORA, 2004 93 culus 52 cm longus; spatha viridis, 24 cm was found on the branches of a fallen tree longis, 1 cm latis; spadix stipitatus ca. 85 and had been growing at about 20 m cm longus, 2 cm diam.; bacca magenta, above the ground. Owing to the difficulty globosa, 6 mm longa, 5 X 7 mm diam. of accessing the canopy, there is no way to make an estimate of the abundance of Epiphyte; stem short; internodes short, the species in the study area. 2.5 cm diam.; cataphyll fibers not col­ The species is a member of A. sect. Por­ lected; root mass more than 30 cm diam. phyrochitonium, characterized by its ro­ LEAVES with petioles subterete, obtusely bust size, rosulate habit, massive root sys­ and deeply sulcate, 14-20 cm long, 12 mm tem, short stem, persisting cataphyll fibers, diam., medium green, weakly glossy; ge­ narrowly oblong-obovate, coriaceous, niculum 4 cm long, 1.3 X 1.7 cm, slightly dark brown-drying blades with the collec­ thicker than broad; blades 45-57 cm long, tive veins arising from the base and by the 19-23 cm wide, 2.2-2.6 times longer than glandular-punctate lower surface. Also wide, narrowly oblong-obovate, short­ characteristic is the pale magenta berries acuminate at apex, acute at base, moder­ as well as the proportionately long inflo­ ately coriaceous, slightly bicolorous, dark rescence with the peduncle about twice as green above, moderately glossy, dark long as the blades. glandular-punctate below, drying dark The species is similar to A. ramonense brown to grayish brown medium-dark Engl. from Central America, but differs brown below; margins convex toward from that species in having a much shorter apex, concave toward base, slightly un­ inflorescence and blades which typically dulate; midrib convex above, thicker than dry paler, usually gray brown. broad, narrowly rounded toward base and convex toward apex below, slightly paler Anthurium arusiense Croat & M. Mora, than surface above and below; primary sp. nov. Type: COLOMBIA. Choc6. lateral veins 14-17 pairs, departing mid­ Municipio Nuquf, Corregimiento Aru­ rib at 50-55° angle, qUilted-sunken above, sf, along the trial to Arusf from Esta­ convex pleated-raised and paler than sur­ ci6n Biol6gica EI Amargal, near Rfo face (yellow green) below; interprimary Arusicito, 5°35' 47"N, 77°28'31''W, 0- veins moderately conspicuous below; col­ 20 m, June 2000, M.
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