Two New Varieties and One Change of Status in Hosta (Asparagaceae)

摘要

Two new varieties, Hosta kikutii F. Maek. var. densinervia N. Fujita & M. N. Tamura and//, kikutii var. scabrinervia N. Fujita & M. N. Tamura are described. Hosta kikutii var. densinervia differs from H. kikutii var. kikutii in having the nerves of the leaves more or less close together and papillose abaxially. Hosta kikutii var. scabrinervia differs from H. kikutii var. densinervia in having the nerves on the abaxial surface of the leaves prominently papillose. Plants belonging to these two varieties were formerly assigned to H. kikutii var. polyneuron (F. Maek.) N. Fujita (= H. polyneuron F. Maek.), which is now regarded as a doubtful taxon. A change in status, H. tsushimensis N. Fujita var. tibae (F. Maek. ex H. Kara) N. Fujita & M. N. Tamura, isalso proposed. A key to the varieties of H. kikutii and a key to the varieties of H, tsushimensis are provided.