紅頭耳鉤草之分類再議

Taxonomic reappraisal of Solanum biflorum var. kotoense (Solanaceae)

伴隨模式標本重現於TCF 標本館，本研究探討紅頭耳鉤草（Solanum biflorum Lour. var. kotoensis Y. C. Liu & C. H. Ou）之分類地位。基於新鮮及乾燥標本之觀察比對，我們將S. biflorum var. kotoensis處理為Lycianthes boninensis之異名。紅頭耳鉤草與近似種紅絲線（Lycianthes biflora（Lour.）Bitter）可藉由光滑之植物體及相異的萼齒形態區分。L. boninensis過往被認定為小笠原群島之特有種，但目前其地理分布延伸至琉球群島及蘭嶼，形成一獨特之植物地理模式。

The identity of Solanum biflorum Lour. var. kotoensis Y. C. Liu & C. H. Ou is reappraised as its type specimen was rediscovered in TCF. Based on comparative study of related fresh and herbaria materials, S. biflorum var. kotoensis is treated as a synonym of Lycianthes boninensis Bitter. L. boninensis could be readily distinguished from closely related L. biflora by its glabrous habits and distinct morphology of calyx teeth. L. boninensis was regarded as endemic to the Bonin Islands, but presently its distribution range extends to the Ryukyu Islands and Lanyu, forming a remarkable phytogeographic pattern. 伴隨模式標本重現於TCF 標本館，本研究探討紅頭耳鉤草（Solanum biflorum Lour. var. kotoensis Y. C. Liu & C. H. Ou）之分類地位。基於新鮮及乾燥標本之觀察比對，我們將S. biflorum var. kotoensis處理為Lycianthes boninensis之異名。紅頭耳鉤草與近似種紅絲線（Lycianthes biflora（Lour.）Bitter）可藉由光滑之植物體及相異的萼齒形態區分。L. boninensis過往被認定為小笠原群島之特有種，但目前其地理分布延伸至琉球群島及蘭嶼，形成一獨特之植物地理模式。