Another entry written by Taisha:
Rhododendron ericoides is described as a shrub with slender branches holding linear leaves and red tubular-cylindric flowers that are collected into a small umbel. The species grows at elevations up to 4000 meters (on Mount Kinabalu).
Rhododendron is a genus with approximately a thousand species, so it is often useful for rhododendron researchers to recognize smaller groups within the genus. Eight subgenera are typically used, along with sections and subsections within these if necessary. Rhododendron ericoides is a member of the subgenus Rhododendron according to the latest (2008) research (PDF). Most older references will state it is a member of the subgenus Vireya, but Vireya is now considered a section of subg. Rhododendron, and Rhododendron ericoides actually belongs to a different section than Vireya: section Discovireya. See the linked PDF reference for the specific details that define the subgenera and sections, but for sect. Discovireya some of the properties include a tubular-cylindric corolla and the valves of its capsular fruit not twisting after dehiscence (opening).
The Vireya group of rhododendrons has often been the subject of biogeographic research (biogeography is a science that studies the spatial distributions of past and present organisms, and of related patterns of variation over the earth). This is in part because of the famed Wallace's line intersecting the distribution of the group within Malesia (e.g.,, see Brown, GK, et al. 2006. Historical biogeography of section Vireya and the Malesian Archipelago. Journal of Biogeography. 33(11):1929-1944).