Campsis grandiflora Chinese trumpet vine - climber

Campsis

The genus Campsis consists of only two species and they both carry the energy of subtropical climbers that, over the course of evolution, learned to ascend using small aerial rootlets and to brace themselves against tree bark as if it were a natural ladder. They belong to the family Bignoniaceae, a group known for its trumpet flowers and often woody climbing habit. C. radicans originates from North America, whereas C. grandiflora comes from East Asia, an intriguing geographical split that suggests a much earlier distribution of the genus’s ancestors across the warmer regions of the Northern Hemisphere. The genus was described by João de Loureiro (1717–1791), a Portuguese missionary and botanist working in Southeast Asia, who defined it on the basis of its characteristically curved stamens, reflected in the Greek kampein, meaning “to bend”. The nomenclatural history is, however, tangled: European gardens of the 17th century were unsure where to place the plant, and it appeared under the names Bignonia, Tecoma and even Apocynum, until the 19th century finally settled the genus in its present form. In the wild it is a climber of bright woodland edges, well‑drained riverbanks and disturbed habitats, where its rapid growth and ability to root along the stems allow it to occupy space before slower woody plants can take hold.

Campsis grandiflora was described by Carl Peter Thunberg (1743–1828), the Swedish physician and botanist, during his stay in Japan, though it must be said straight away that the species itself originates from the warmer regions of China, where it had been cultivated for centuries in temple gardens, courtyard plantings and rural homesteads. In Chinese garden tradition it held both a place and a certain reverence: it symbolised the height of summer and was often planted where its colours could brighten the late season. From there it spread to neighbouring countries with warmer climates and became part of the cultural exchange between China and Japan, where it was welcomed as a plant of exotic charm and long-standing tradition. It reached Europe only in the 19th century, at a time when gardeners were searching for species capable of bringing a touch of southern atmosphere into temperate climates. While its North American relative C. radicans quickly earned a reputation as an indefatigable conqueror of fences and walls, grandiflora was seen as its gentler, more refined, though admittedly slightly more tender counterpart, suited to sheltered positions where it can show its beauty without the risk of cold damage.

When Thunberg described Campsis grandiflora, it was not a discovery made in the wild but the result of an unusual collaboration between a European botanist and Japanese scholars. Thunberg was not allowed to move freely in Japan – he was confined to the small island of Dejima in Nagasaki and could leave it only on official journeys to Edo (modern Tokyo). Most plants he therefore never saw in nature; they were brought to him by local physicians and students of medicine who shared his interest in natural science and horticultural enthusiasm, and who wished to show him plants from regions he could never visit himself. C. grandiflora was among the ornamental species imported from China and grown in Japanese gardens, and it was in this cultivated form that it reached Thunberg – a rarity even for the Japanese themselves. His description thus captures not only a botanical species but also the atmosphere of a time when botanists worked under strict limitations and depended on the generosity and curiosity of local experts.