Disterigma appendiculatum Pedraza
-
Authority
Pedraza-Peñalosa, Paola. 2010.
(Ericaceae, Vaccinieae). Fl. Neotrop. Monogr. 108: 1-126. (Published by NYBG Press) -
Family
Ericaceae
-
Scientific Name
-
Type
Type. Colombia. Valle del Cauca: Mun. El Cairo, Corregimiento El Boquerón, Vereda El Brillante, Cerro del Inglés, en la Serranía de los Paraguas, 4°45'4.5?N, 76°16'24.2?W, 2100 m, 22 Jul 2004 (fl, fr), P. Pedraza & C. Pedraza 1113 (holotype, COL; isotypes, AAU, CUVC, MO, NY).
-
Etymology
The species epithet refers to the staminal spurs.
-
Description
Species Description - Terrestrial shrubs, scandent or erect, 0.5–1.5 m tall. Young branchlets thick and reddish, ridged, ± smooth, villous, the hairs eglandular and golden brown, the indumentum of the mature branches similar but glabrate. Leaves 2–3 per cm, spirally arranged, diffuse; petiole 2.8–4 mm long, villose, the hairs eglandular; lamina ovate, 1.8–2.8 × 1.1–1.8 cm, basally obtuse or cuneate, marginally entire, apically ciliolate with eglandular hairs, apically acuminate, adaxially glabrate with eglandular hairs, abaxially glabrate with glandular hairs, the venation 5-nerved on both sides, the midvein adaxially impressed and abaxially raised. Axillary solitary flowers and rarely in 2-flowered fascicles; bracts 14–15, chartaceous, ovate, elliptic, or suborbicular, 0.7–6.3 × 1.4–6 mm, marginally eciliate, apically obtuse and often splitting, abaxially glabrous; pedicel 0.8–2.4 mm long, reduced and hidden by overlapping bracts, glabrate with eglandular and glandular hairs; differentiated apical bracteoles 2, distinct, chartaceous, enveloping to upper half of calyx lobes or
Distribution and Ecology - Disterigma appendiculatum is endemic to the cloud forests of Serranía de los Paraguas in Valle del Cauca, Colombia, at 1850–2100 m, where it does not seem to be abundant (Fig. 9). Flowering and fruiting in Apr and Jul.
-
Discussion
Disterigma appendiculatum is the only species in the genus with staminal spurs (Fig. 12G). Its appendages are flat, contrary to the more common horn-shaped spurs in other spurred Vaccinieae. This species is also characterized by numerous floral bracts, differentiated apical bracteoles enveloping 98–100% of the calyx, 5- merous flowers, imbricate calyx aestivation, ovate and imbricate calyx lobes at anthesis with the sinuses obscured by the overlapping calyx lobe bases, adaxially glabrate corolla, stamen filaments connate into a tube, fruits crowned by the converging calyx lobes, and viviparous seeds (Fig. 12). Although D. appendiculatum has a unique combination of characters that separates it from the other species of Disterigma, its external morphology recalls that of D. cryptocalyx (Colombia and Ecuador). The floral differences between these two species are many and are summarized in Table VI.
-
Objects
-
Distribution
Colombia South America| Valle del Cauca Colombia South America|