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Project Name Data (Last Modified On 7/23/2013)

Flora Data (Last Modified On 7/23/2013)
Species Disterigma trimerum Wilbur & Luteyn
PlaceOfPublication Brittonia 29: 258. 1977.
Note TYPE: Panama, Wilbur & Luteyn 19321 (DUKE, holotype; CAS, DUKE, F, GH, MICH, MO, NY, PMA, US, isotypes).
Description Epiphytic or terrestrial, bushy shrubs 0.5-1.5(-2) m tall; branchlets sharply ridged and grooved, indistinctly 3-angled to irregularly 4-angled, glabrous, sparingly strigillose or minutely puberulent; mature branches becoming terete, grayish to blackish, conspicuously fissured; internodes V'/5-3% as long as the sur- rounding leaves. Leaf blades coriaceous, entire to obscurely and microscopically serrulate, broadly elliptic to somewhat obovate or spatulate, (0.8-)1.2-1.8 cm long, (4-)6-12 mm wide, apically obtuse to broadly rounded, basally cuneate, glabrous above, beneath evenly but sparingly beset with appressed, amber colored trichomes 0.2-0.3 mm long; midvein and the principal veins slightly elevated above to nearly plane, beneath the midvein and the 1-2 pairs of paralleling prin- cipal veins plane or slightly elevated, dark green above, pale green beneath; petioles 3-5 mm long, glabrous, flattened above. Inflorescence of solitary, axillary, subsessile flowers; pedicles disarticulating apically, 2-3 mm long; bracteoles subopposite, broadly clasping, semiorbicular, ciliate, 1.5-1.8 mm be- low the base of the calyx tube, ca. 1.5 mm long, 1.8-2.0 mm wide, scarcely overlapping the base of the hypanthium; bracts 1-3, deltoid to acutely oblong, situated near the base of the pedicel. Flowers with the hypanthium terete, short, cylindric, glabrous, ca. 3.5 mm long, 2.0-2.2 mm in diameter; calyx lobes 3, erect, broadly deltoid, acute, ca. 0.5 mm high, entire, eciliate, glabrous; corolla deep red, thinly fleshy, the tube cylindric, abruptly tapering into a basal por- tion 2.0-2.3 mm long, 1.0-1.4 mm in diameter, the longer portion of the tube 5.0-5.5 mm long, ca. 2.5 mm in diameter, trichomes few, ascendent, 0.1-0.2 mm long, the lobes 3, erect, 1.5-2.0 mm long, 1.0-1.2 mm wide, acute, oblong deltoid; stamens 6, ca. 1 mm shorter than the corolla tube, the free portion of the filaments ca. 2.5 mm long, flattened, glabrous, the anthers granular, 2.5-2.8 mm long, each theca tapering into a slender tubule 2.5-2.8 mm long, dehiscing by an introrse, elongate, oval slit ca. 1.5 mm long; style glabrous, slender, ex- tending 1.0-1.2 mm beyond the stamens or to the top of the corolla tube. Berry at first greenish white turning dark blue.
Note Except for this species, trimerous flowers are not known in Disterigma. The deep red corollas of D. trimerum are unlike those of any other Central American representative of the genus.
Distribution endemic to western Panama.
Specimen CHIRIQUI: Cloud forest on Caldera-Chiriquicito Trail between Q. Hondo and divide, Kirkbride & Duke 939 (DUKE). Heavily forested slopes along W side of Cerro Horqueta, 1700-1800 m, Luteyn 3750 (DUKE, NY). Premontane cloud forest along ridge E of Cerro Horqueta, 1700-1900 m, Luteyn & Wilbur 4611 (DUKE, NY, US). Cerro Hornitos, 40 km NW of Gualaca, cloud forest dominated by Quercus, Podocarpus and Drimys 2238 m, Mofi & Bolton 7470 (DUKE, MO). Slopes approaching Cerro Horqueta 6.6 km NNE of Boquete, 1500-1800 m, Wilbur & Luteyn 19321 (CAS, DUKE, F, GH, MICH, MO, NY, PMA, US).
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