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A New Species of Pouteria Aublet (Sapotaceae) from Costa Rica and Colombia

1997; Missouri Botanical Garden Press; Volume: 7; Issue: 2 Linguagem: Inglês

10.2307/3392190

1945-6174

Quírico Jiménez Madrigal, T. D. Pennington, Quírico Jiménez Madrigal,

Plant and Fungal Species Descriptions

Pouteria bulliformis, a new species of tropical rainforest of Costa Rica and Colombia, is described and illustrated. The opening of new roads, especially logging roads, into the Osa Peninsula within the last decade has been accompanied by colonization together with acceleration of the destruction of Costa Rica's most diverse tropical humid forest. However, these same roads have greatly facilitated botanical exploration, resulting in the discovery of numerous new species of trees. Pouteria is a pantropical genus of about 350 species of trees, with about 200 species in the Neotropics (Pennington, 1990). The following description of Pouteria bulliformis Q. Jimenez & T. D. Pennington brings to 33 the number of species presently known from Costa Rica. Pouteria bulliformis Q. Jimenez & T. D. Pennington, sp. nov. TYPE: Costa Rica. Puntarenas: Peninsula de Osa, Reserva Biol6gica Marenco, 8040'40N, 83*41'00W, 100 m, 1620 Feb. 1988 (fl), Q. Jiminez et al. 552 (holotype, INB; isotype, K). Figure 1. Ex affinitate P simulantis Monachino surculis et inflorescentiis tomentosis; foliis minoribus, bullatis, apice rotundato, aliquando brevissimo cuspidato, nervis tomentosis praecipue differt. Trees 15-30 m tall, with dense crown of spreading or occasionally pendulous branches. Trunk 3045 cm DBH, generally cylindrical, with small buttresses up to 1 m high and 50 cm radially. Bark brown or reddish brown, exfoliating in rectangular plates up to 25 x 10 cm; inner bark white. Young branches densely ferruginous-tomentose. Petiole 1.7-3 cm long, channeled above, ferruginous-tomentose. Leaf blades dark green adaxially, pale green abaxially, 15-33 X 9-16 cm, broadly elliptic to elliptic-oblong or obovate, chartaceous, bullate, ferruginous-tomentose below, especially on the veins, rounded apically and sometimes shortly cuspidate, rounded basally; margins entire; venation ? brochidodromous, midrib sunken adaxially, very prominent abaxially, secondary veins 14-23 pairs, parallel, straight or slightly arcuate, sunken adaxially, prominently abaxially, tertiary veins oblique, quaternaries reticulate. Inflorescences axillary, fascicles 2-8-flowered. Pedicels 4-21 mm long, densely ferruginous-tomentose. Sepals 5, ? free, imbricate, 4-4.5 mm long, ovate, rounded apically, pubescent without, glabrous within. Corolla cyathiform; tube ca. 3 mm long; lobes 5, imbricate, 33.5 mm long, broadly ovate, rounded apically, glabrous. Stamens 5; free portion of filaments ca. 0.75 mm long, anthers 2-2.5 mm long. Staminodes 5, alternating with the stamens, 2.5-3 mm long, lanceolate. Disk absent. Ovary conical, densely pubescent, 2-locular, locules uniovulate. Style ca. 1.5 mm long, glabrous, included. Fruit 4-4.2 X 3 cm, ellipsoid, obtuse to acute apically, rounded to truncate basally, sepals persistent, pubescent. Seeds ca. 3 cm long with an adaxial scar ca. 1 mm wide. Distribution. Pouteria bulliformis is known by just a few collections from Costa Rica and Colombia. In Costa Rica it occurs in both the Pacific and Atlantic drainages. On the Pacific slope it is known only from the Osa Peninsula, while on the Atlantic it is known from coastal lowlands near Lim6n and from the Llanuras de San Carlos. The new species occurs in the Tropical Wet Forest and Tropical Wet Premontane Transition of the Holdridge system (Tosi, 1969), in a tropical rainforest type of vegetation (G6mez, 1986) with a hot, wet climate (Herrera, 1986). It is usually found on hilly, welldrained areas of primary forest. On the Osa Peninsula it grows in association with Humiriastrum diguense Cuatrecasas, Brosimum utile (Kunth) Oken, and Vochysia ferruginea Martius. Paratypes. COSTA RICA. Puntarenas: Penfnsula de NovoN 7: 169-171. 1997. This content downloaded from 157.55.39.211 on Fri, 24 Jun 2016 06:30:30 UTC All use subject to http://about.jstor.org/terms