Abstract: Cladistic analysis of the morphological, anatomical, pollen morphological and cytological relationship of 16 species of Lycoris(Amaryllidaceae) was carried out with attempt to have a better understanding of the phylogeny of Lycoris.Thirty-seven morphological, anatomical, pollen morphological and cytological characters were selected and used in the maximum parsimony(MP) tree construction executed with PAUP^* program.Twenty-eight morphological, pollen morphological and cytological characters were also selected to construct MP trees.The topologies of the trees obtained were largely in congruence.In the same way, MP trees were constructed using 9 morphological characters to study the relationship of 11 species of Lycoris(Amaryllidaceae).They were L. radiata, L.×houdyshelii, L.×haywardi, L. sprengeri, L. squamigera, L. longituba, L. anhuiensis, L. chinensis, L. aurea, L.×abiflora.The result was the same as before.It was indicated that the 16 species of the genus Lycoris were divided into two groups, and four species of the genus which belonged to Lycoris subgenus including L. radiata, L.×rosea, L.×straminea and L.×houdyshelii were clustered together respectively.The others were clustered together respectively.They were L.guangxiensis, L.×haywardi, L. sprengeri, L. incarnata, L. squamigera, L. longituba, L. anhuiensis, L. chinensis, L. aurea, L.×abiflora, L.caldwellii and L.shaanxiensis.The classification was basically consistent with the fingerprints of Lycoris on RAPD except L. sprengeri, L. incarnata and L.×houdyshelii.The latter group was also divided into two subgroups.L.guangxiensis, L.×haywardi, L. sprengeri, L. incarnata and L. squamigera were clustered together respectively, whose flowers were actinomorphic except L.guangxiensis.The others including L. longituba, L. anhuiensis, L. chinensis, L. aurea, L.×abiflora, L.caldwellii and L.shaanxiensis were clustered together respectively, whose flowers were zygomorphic except L. longituba and L. anhuiensis.Therefore, whether corolla was in order or not was an important classification character, but that which was considered as the character for subgenus classification was not supported in this paper.However, the position relation of the stamen and perianth slice can be used as the character for large group division, whether which could be as the basic feature for subgenus division still needed to be studied.The result also showed that leaf micro-morphological characteristics were useful for considering the inter-species relationship on Lycoris, and the period of leaves growing was not importance of considering that.The closest relationship was between L. chinensis and L. aurea, which were consistent with morphological study.

Key words: Lycoris, cladistic analysis, phylogeny, PAUP^* program