Monographs Details: Disterigma hammelii Wilbur & Luteyn
Authority: Pedraza-Peñalosa, Paola. 2010. (Ericaceae, Vaccinieae). Fl. Neotrop. Monogr. 108: 1-126. (Published by NYBG Press)
Description:Species Description - Epiphytic shrubs, wiry, pendent. Young branchlets ridged, ± smooth, pubescent, the hairs eglandular, brown-reddish, the indumentum of the mature branches similar but glabrate. Leaves 8–9 per cm, apparently distichous, patent; petiole 0.5–1 mm long, glabrous; lamina lanceolate or sometimes elliptic, (0.4–)0.5–0.8 × (0.1–)0.2(–0.3) cm, basally cuneate, marginally entire, apically ciliolate with deciduous eglandular or glandular hairs, apically blunt-acute, adaxially glabrous, abaxially glabrate with minute glandular hairs, the venation adaxially obscure, abaxially hyphodromous with the midvein raised. Axillary solitary flowers; bracts 5–8, chartaceous, ovate, 0.6–2 × 0.6–2 mm, sometimes marginally ciliolate with few minute eglandular hairs, apically obtuse or rarely obtuse and cuspidate, abaxially glabrous; pedicel 0.8–1 mm long, much reduced and hidden by overlapping bracts, glabrous; differentiated apical bracteoles 2, distinct, chartaceous, enveloping to the base of calyx lobes, covering 33–50% of calyx, ovate, 1.6–2.2(–2.7) × 2.2–2.3 mm, marginally ciliolate with minute eglandular hairs, apically obtuse or obtuse and cuspidate, the surface smooth, abaxially and adaxially glabrous. Flowers 4-merous. Calyx aestivation valvate, campanulate, 4–4.8 mm long; tube slightly angled, 1.2–1.4(–1.8) mm long, abaxially glabrous; limb 2.7–3.4 mm long, abaxially puberulous with eglandular hairs (apically), adaxially glabrous; lobes triangular, 2.5–3.1 × 0.7–0.9 mm, marginally ciliolate with eglandular hairs (especially apically), apically acute; sinuses acute (V-shaped). Corolla pink or white (fide collectoris), chartaceous, bistratose, tubular in herbarium specimens, 11–14.3 mm long when dry, 2.4–3 mm diam. when dry, 2.4–3 mm wide at throat when dry, abaxially glabrate with eglandular hairs, adaxially glabrous; lobes 1.5–2(–2.3) × 0.8– 0.9 mm, apically acute, adaxially rugose. Stamens 8, 12–13 mm long, exserted; filaments distinct, straight, × linear with parallel sides, 8.5–9 mm long, abaxially and adaxially pilulose; anthers distinct, papillae on both thecae and tubules; thecae 1.4–1.6 mm long, without basal appendages; tubules 2, distinct, 2.4–2.7 mm long, dehiscing introrsely by longitudinal slits, 0.8–1.3 mm long. Ovary 4-locular; style 13–14.3 mm long, exserted. Berry unknown.

Distribution and Ecology - Disterigma hammelii is endemic to the area around Cerro Pate Macho and Palo Alto, Prov. Chiriquí, Panama (Fig. 26). This species grows in cloud forests at 1800–2200 m, and has not been collected since 1988. Flowering in Feb, Mar, May, and Dec.


Disterigma hammelii is characterized by a wiry habit; leaves apparently distichous, patent, small, and narrow; corollas pink or white, tubular, more than 1 cm long; stamens and style more than 1 cm long; and papillae on both thecae and tubules. Vegetatively, D. hammelii is similar to D. agathosmoides; see D. agathosmoides for comparisons.

Distribution:Panama Central America| Chiriquí Panamá Central America|