Showing papers on "Michelia published in 2004"

Notes on Magnoliaceae IV

Abstract: A new system of Magnolioideae (Magnoliaceae) is given, based on the latest available data on DNA and morphology. New combinations and name changes in Malesian Magnolia are given as well as some corrections in previously published names.

Chemical studies on flowers of Michelia champaca

Abstract: The flowers of Michelia champaca have been shown to contain the flavonoid quercetin and an unidentified flavonoid glycoside besides I²-sitosterol, unsaturated aliphatic ketones, and hydrocarbons. The isolation of quercetin forms the first report of the occurrence of this flavonoid in the genus Michelia.

Karyotypical Studies on Michelia chapensis Dandy (Magnoliaceae)

Abstract: Michelia chapensis Dandy is firstly karyomorphologically studied Its karyotype can be formulated as 2n=38=28 m+6 sm+4 st (2SAT), belonging to Stebbins's 2B type This is a new karyotype report, which, different from the previous confirmation that in Michelia group, the whole karyotypes of genus are of uniform 2A and there is no st chromosome occurred There might be different karyotypes within Michelia, and M chapensis is probably a relatively advanced species We briefly discuss the role of minor chromosomal structural alterations played in evolution of genus or species in Magnoliaceae

Michelia guangdongensis (Magnoliaceae), a new species from China

Abstract: The genus Michelia, including 50 taxa, mainly occurs in China, India, Sri Lanka, Indochina, Malaysia and south Japan (Law et al. 1995, Law 1996). Forty-one species of Michelia are recorded from China (Law 1996), and this country is considered the centre of modern distribution and diversity of the genus (Law 1984, Law et al. 1995, Law 1996, Law 2000). In a recent survey at the mountaintop of Chuandiding in Yingde, Guangdong, China, we found a species of Michelia with a short stature, small leaves, white flowers and dense rufous hairs on the lower surface of leaves. It can not be placed in any of the previously described taxa and is thus here described as a new species.

Taxonomic revision of the Magnoliaceae from Jiangxi Province

Abstract: Based on both field investigation and herbarium specimens, taxonomic revision of and supplement to the Magnoliaceae from Jiangxi Province are made The names of 1 sect and 2 species are reduced, ie Manglietia Sect Decidua Q Y Zheng is reduced to Sinomanglieta Z X Yu, Manglietia decidua Q Y Zheng is reduced to Sinomanglieta glauca Z X Yu et Q Y Zheng, Michelia jiangxiensis Chang et B L Chen is reduced to Michelia chapensis Dandy As a result, 7 genera, 22 species and 1 subspecies are recognized in the Magnoliaceae from Jiangxi Province

A Cytological Study on the Cytology of Michelia figo (Magnoliaceae)

Abstract: A study cytological on the cytology of Michelia figo was carried out. The chromosome number of it was confirmed to be 2n=2x=38. The ratio of the longest to the shortest was 2.2, no st chromosome and satellite were found. The meiosis process of it was firstly investigated and described.

Karyotypical studies on {\sl Michelia chapensis} Dandy (Magnoliaceae)

Abstract: Michelia chapensis Dandy is firstly karyomorphologically studied. Its karyotype can be formulated as 2n=38=28 m+6 sm+4 st (2SAT), belonging to Stebbins's 2B type. This is a new karyotype report, which, different from the previous confirmation that in Michelia group, the whole karyotypes of genus are of uniform 2A and there is no st chromosome occurred. There might be different karyotypes within Michelia, and M. chapensis is probably a relatively advanced species. We briefly discuss the role of minor chromosomal structural alterations played in evolution of genus or species in Magnoliaceae.

Research on the Characteristics and Dynamics of Michelia chapensis Communities

Abstract: Michelia chapensis is a rare and endangered tree species; its natural communities are scarce. This paper discusses Michlia chapensis communities' geographical composition, regional features, community appearance, and structure and population dynamics. The results show that Michelia chapensis species is rich, its geographical composition much diversified, its source in 12 geographical distribution types, its regional features obviously transitional, its live communities in a middle and high position but typical of the area of subtropical zone. Among the communities of arbor layers, the important value of Michelia chapensis is as high as 159.55, possessing an obviously advantageous position. It is known from the analysis of the dynamics of Michelia chapensis population that this community is being in a relatively steady succession stage and needs effective protection.