Rhododendron lapponicum
Rhododendron lapponicum is a dwarf species of Rhododendron native to arctic and subarctic regions of North America, Europe, and Asia. It is commonly known by the names Lapland Rosebay, Rhododendron de Laponie in French-speaking Canada, and gāoshān dùjuān in China. The specific epithet lapponicum was given to the species by Carl Linnaeus, naming it after the Swedish region of Lapland.
Description
R. lapponicum is a small perennial subshrub that may grow in prostrate or erect forms depending on local conditions. In harsh alpine environments, it may reach only 5 cm in height. Elsewhere, it may form a multi-branched shrub 20 cm to 1 m tall. It is able to produce clonal colonies through spreading rhizomes, with a single colony having a lifespan of several decades.The evergreen leaves can be elliptic, ovate, or obovate in shape and are 0.4–2.5 cm long. They are attached to the stem on petioles 1.5-4 mm long. The leaf is coriaceous with the entire surface, including the petiole, being covered in golden or rust-colored scales. The leaf margins are entire, and may be plane or revolute.
The inflorescence is a fascicled raceme with 3-6 flowers. Each flower is born on a pedicel 2.5-14 mm long. Both the pedicel and calyx are covered in rust-colored scales. The corolla is broadly funnel-shaped and 0.65-1.5 cm wide. The petals are violet rose to purple, and rarely white, in color. Each flower bears 5-10 stamens, 7-13 mm long. The plant flowers in spring and summer, with the exact timing dependent on latitude and elevation.
The fruit is a cylindric-ovate capsule, 4-7 mm long by 2-3 mm wide, densely covered in rust-colored scales.
Distribution and Habitat
R. lapponicum has a wide-ranging circumpolar distribution, occurring in arctic and alpine tundra environments across northern North America, northern Europe, and northeastern Asia. It grows at elevations ranging from sea level to 1,900 m. It may be found in rocky barrens, heaths, bogs, beach ridges, or sandy stream banks. In eastern alpine ecosystems, it is commonly associated with cushion-tussock and heath-shrub-rush plant communities.In North America, it mostly occurs across Alaska, Canada, and Greenland. In western Greenland, it is known to hybridize with R. tomentosum producing the hybrid species R. × vanhoeffenii. In the contiguous United States, it is historically known from only four locations: Mount Marcy in New York, the Presidential Range in New Hampshire, Mount Khatadin in Maine, and two sandstone ledge sites in the Driftless Area of southwest Wisconsin. In July of 2015, a previously unknown population of R. lapponicum was identified in Chittendon County, Vermont. It is unclear when this population became established, but there is no evidence to suggest it did not arrive by natural means. These disjunct populations likely represent remnants of a more widespread southerly distribution of the species that existed during, or soon after, the last glacial advancement.
In Europe, the species is native to the Scandinavian nations of Norway, Sweden, and Finland. In Asia, it can be found in Northeast China and Inner Mongolia, Mongolia, Japan, North Korea, and Siberia.