Acta Phytotaxonomica Sinica

Four species and one variety in the genus Rhododendron subgen. Azaleastrum, namely R. kailiense Fang & M. Y. He and R. linearicupulare Tam R. latoucheae Franch., R. esquirolii Levl., and R.championae Hook. var. ovatifolium Tam arc reduced to synonyms. Key words Rhododendron, Rhododendron subgen. Azaleastrum, new synonymy.

Lian-Ming GAO

Five new synonyms in the genus Rhododendron subgen. Azaleastrum (Ericaceae) from China

中国杜鹃花亚属五种新同物异名(杜鹃花科)

Rhododendron is the largest genus within the subfamily Rhododendroideae, which has about 1000 known species in the world and more than 500 species in China. Since the genus was established by Linnaeus, its infrageneric relationships have been well studied by many taxonomists on the basis of morphological characters and molecular data. In 1996, Chamberlain et al. proposed a new system of Rhododendron with eight subgenera, i.e., Azaleastrum, Candidastrum, Hymenanthes, Mumeazalea, Pentanthera, Rhododendron, Therorhodion, and Tsutsusi. In this paper, micromorphological characters of leaf epidermis in 4 varieties, 48 species, 6 subgenera of Rhododendron from China were examined using light microscopy (LM) and scanning electron microscopy (SEM). Leaf epidermal features are described and micromorphological types are distinguished here according to morphological characters such as scale, gland, foliar trichome and stomatal apparatus of leaf epidermis. It is shown that the leaf epidermal cells are usually irregular or polygonal in shape. The patterns of anticlinal walls are straight, arched or undulate. The stomatal apparatuses are anomocytic and are usually found on abaxial, not adaxial, epidermis. The results also show that: (1) the lepidote rhododendron (i.e., subgen. Rhododendron), which has both scales and papillae on leaf epidermis, differs distinctly from the elepidote rhododendron; (2) three types of leaf epidermis are identified in subgen. Hymenanthes (i.e., R. fortunei-type, R. chihsinianum-type and R. simiarum-type), whereas four in subgen. Tsutsusi (i.e., R. mariesii-type, R. simsii-type, R. mariae-type and R. flosculum-type); (3) except for R. westlandii and R. henryi, the species of subgen. Azaleastrum show similar morphological characters, i.e., dense stomatal apparatuses surrounded by ringed or discontinuous striates; (4) R. molle of subgen. Pentanthera differs from the species of other subgenera on morphological characters such as foliar trichomes, dense stomatal apparatuses with asymmetrical outer stomatal rims surrounded by undulate-striates, and no gland; (5) only R. redowskianum is found with distinct T-pieces at the polar region of guard cells in Rhododendron. The results support the conclusion inferred from molecular systematic studies that subgen. Therorhodion is the basal clade of Rhododendron. Finally, the relationships between the closely related species are also discussed on the basis of leaf epidermal features.

Wang Yu

Leaf epidermal features of Rhododendron (Ericaceae) from China and their systematic significance

中国杜鹃花属（杜鹃花科）叶表皮特征及其系统学意义

Typhonium baoshanense Z. L. Dao H. Li (Araceae: Areae), a new species from western Yunnan, China, is described and illustrated. This species differs mainly from other species of Typhonium by the presence of one to two rings of sterile male flowers above the fertile male flowers, and from T. blumei Nicolson Sivadasan by a conic female part of the spadix, the appendix not being truncate at its base, and by the angustate limb of the spathe. The chromosome number of Typhonium blumei, which occurs in same area, is 2n=52, while the chromosome number of the new species is 2n=10. The chromosome number of the new species is the lowest in the family Araceae.

Dao Zhi

Typhonium baoshanense Z. L. Dao & H. Li, a new species of Araceae from western Yunnan,China

中国云南西部天南星科新种——保山犁头尖（Typhonium baoshanense Z. L. Dao & H. Li）

A new species of the genus Drepanostachyum Keng f. of Bambusoideae from China,D. stoloniforme S. H. Chen Z. Z. Wang,which was found to grow in Xiamen Botanical Garden,Fujian Province,is described and illustrated. The new species is similar to D. microphyllum (Hsueh Yi) Keng f. ex Yi,but differs by having distinctly thin liana,culm diameter 3–6 mm,culm wall 1 mm; 25–55 nodes in whole culm,internode of the basic culms 5–9 cm long,internode of the middle culms 13–18 cm long,joint of the node 1–2 mm long; the sheath tongue about 0.5 mm high,the cilium of the sheath tongue about 2 mm long; the ligula about 3 mm high,and the cilium of the ligula about 4 mm long; the small leaf 2–6 cm long and 0.3–0.6 cm wide in adult bamboo,and its secondary veins with 3–4 couplets.

Chen Song

Drepanostachyum stoloniforme S.H.Chen & Z.Z.Wang,a new species of Bambusoideae from China

中国竹亚科一新种——匍匐镰序竹（Drepanostachyum stoloniforme S.H.Chen & Z.Z.Wang）

Micromorphological characters from fruit surface of 24 species and seed coat of 21 species, 6 subgenera of Rhododendron from China, i.e., Azaleastrum, Hymenanthes, Pentanthera, Rhododendron, Therorhodion and Tsutsusi, were examined under the scanning electron microscope. Ledum palustre was also examined to compare with the species of Rhododendron. The micromorphological characters of fruit surface and seed coat in Rhododendron are described in this paper. Different types are distinguished here on the basis of morphological characters such as scale, trichome, stomatal apparatus of fruit surface, and ornamentation of seed coat. Compared with seeds of extant and fossil Rhododendron species, some new seed types in Rhododendron species from South China are found. R. redowskianum of subgen. Therorhodion has sparse short setas on the fruit surface without stomatal apparatus. Outline of its slightly flattened and unwinged seed is narrowly oblong. Subgen. Rhododendron, the lepidote rhododendron, with scales on fruit surface, as well as brain-line ridge on the seed coat, differs distinctly from the elepidote rhododendron. Fruit surface of the species in subgen. Hymenanthes belongs to R. fortunei-type, which is characterized as the irregular cuticular membrane without trichome, with stomatal apparatus rarely seen. In the species of subgen. Tsutsusi, the type of fruit surface belongs to R. mariae-type, which is characterized as the compact cuticular membrane with thick trichomes. As far as seed coat is concerned, only one type is found in subgen. Hymenanthes (i.e., R. fortunei-type), whereas two types occur in subgen. Tsutsusi (i.e., R. meridionale-type and R. mariae-type). The species of subgen. Azaleastrum show the great divergence on morphological characters. Separately, sect. Choniastrum and sect. Tsutsusi exhibit their own micromorphological characters. According to the morphological characters of fruit surface, R. molle of subgen. Pentanthera differs distinctly from the species of other subgenera. However, its R. molle-type seed is similar to R. fortunei-type seed. The above-mentioned morphological characters support the results frommolecular systematic studies: except for subgen. Therorhodion, the lepidote rhododendron (subgen. Rhododendron) plus Ledum, is monophyletic; subgen. Tsutsusi from China and subgen. Hymenanthes are both monophyletic; subgenera Azaleastrum and Pentanthera are both polyphyletic; and in subgen. Azaleastrum, sect. Choniastrum and Tsutsusi are both monophyletic. Furthermore, the relationships between the closely related taxa are also inferred from micromorphological characters and molecular data. This study provides micromorphological evidence to support the separation of R. bachii from R. ovatum as a distinct species.

A systematic study of the genus Rhododendron (Ericaceae) using micromorphological characters of fruit surface and seed coat

利用果实表面和种子被微形态特征对杜鹃花属（杜鹃花科）的系统研究

利用超薄平板微型聚丙烯酰胺凝胶的等电聚焦电泳技术,对玄参科Scrophulariaceae地黄属Rehmannia 6种植物和崖白菜属Triaenophora 2种植物共52份材料进行了7个酶系统的等位酶分析.在7个酶系中共检测到18个清晰位点和45个等位基因,多态位点为17个; 并将遗传学数据用软件Biosys-1进行分析,结果表明: 同种内个体间表现出较大的遗传同质性,而不同种的个体则表现出明显的趋异性.除高地黄R.elata和裂叶地黄R.piasezkii外,其余6种植物之间遗传分化较明显,8个种按聚类结果分为两支,崖白菜属的崖白菜T.rupestris和神农架崖白菜T.shennongjiaensis聚为一支,位于分支树的基部; 地黄属的地黄R.glutinosa、茄叶地黄R.solanifolia、天目地黄R.chingii、湖北地黄R.henryi、高地黄和裂叶地黄为另一支.在地黄属中,高地黄和裂叶地黄之间的亲缘关系最近,地黄和裂叶地黄关系最远.本研究结果不支持把高地黄和裂叶地黄作为两个独立的种.地黄属与崖白菜属在遗传上具有较高水平的相似性,它们在生活史和形态学上仍然保留有许多共同的特征,说明它们之间分化的时间可能不长.

Publication Information	Publisher: Wiley-Blackwell，Publishing cycle: ，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 2004，Proportion of original research papers: ，Self Citation Rate:， Gold OA Rate:

Acta Phytotaxonomica Sinica

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Five new synonyms in the genus Rhododendron subgen. Azaleastrum (Ericaceae) from China

Leaf epidermal features of Rhododendron (Ericaceae) from China and their systematic significance

Typhonium baoshanense Z. L. Dao & H. Li, a new species of Araceae from western Yunnan,China

Drepanostachyum stoloniforme S.H.Chen & Z.Z.Wang,a new species of Bambusoideae from China

A systematic study of the genus Rhododendron (Ericaceae) using micromorphological characters of fruit surface and seed coat

地黄属和崖白菜属等位酶的变异研究

Leaf epidermal features of Rhododendron (Ericaceae) from China and their systematic significance

Typhonium baoshanense Z. L. Dao & H. Li, a new species of Araceae from western Yunnan,China

Drepanostachyum stoloniforme S.H.Chen & Z.Z.Wang,a new species of Bambusoideae from China

A systematic study of the genus Rhododendron (Ericaceae) using micromorphological characters of fruit surface and seed coat