摘要:

RICHARDS, A. J., 1990.Studies inGarcinia, dioecious tropical fruit trees: the origin of the mangosteen (G. mangostanaL.).Mangosteen does not grow in the wild state. Plants are said to be invariable, and almost all are female. Mangosteen (2n=?88–90), an obligate agamosperm, has only two close relatives,G. hombroniana(2n= 48) andG. malaccensis(2n=?42) which are facultative agamosperms. For the 13 main characters by which they differ, mangosteen takes an intermediate morphological position for five characters, and resembles each of the other species for four of the remainder. It is suggested that mangosteen is an allopolypoid derivative of these species which arose as a female from a single hybridization event in cultivation, and which has since reproduced asexually. To overcome difficulties in propagation and establishment that mangosteen presents, attempts should be made to graft and hybridize mangosteen with its presumptive parent

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb00191.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

CRISP, M. D.&TAYLOR, J. M., 1990.A new species ofBentleyaE. Bennett (Pittosporaceae) from southern Western Australia.HithertoBentleyahas been a monotypic genus known from a restricted area in south‐west Western Australia. This paper describes a second species which was discovered recently in the same region. The new species differs fromB. spinescensin its remarkable habit but shares with it several floral characters which are unique within the famil

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb00192.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

REJDALI, M., 1990.Seed morphology and taxonomy of the North African species ofSideritisL. (Lamiaceae).Seed morphology data are shown to support data from general morphology and palynology; they can be used for taxonomy at the sectional and specific levels. At times clear differences are apparent at the infraspecific level. Seed sculpturing was found to be of great value for separating taxa at all levels of the hierarchy.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb00193.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

RIVERA NUÑEZ, D., OBON DE CASTRO, C., TOMAS‐LORENTE, F., FERRERES, F.&TOMAS‐BARBERAN, F. A., 1990.Infrasectional systematics of the genusSideritisL. sectionSideritis(Lamiaceae).A new taxonomic division of the sectionSideritisis proposed on the basis of morphological, cytological and chemical characters. The following subsections art‐recognized:Grandiflora, Ovata, Camarae, Linearifolia, Gymnocarpae, Stachydioides, Lacaitae, Hirsuta, Chamaedryfolia, Arborescens, Flavovirens, Leucantha, Angustifolia, SerrataandScordioides. Possible evolutionary pathways are dis

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb00194.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

MANGALY, J. K.&NAYAR, J. 1990.Palynology of South Indian Zingiberaceae.Light microscope studies on pollen morphology of 21 Old World, tropical taxa of Zingiberaceae reveal that an exine is absent only inKaempferia. A discontinuous exine layer consisting of circular plates joined together at margins occurs inAlpinia galangaandAmomum hypoleucumwhile all other taxa possess an uninterrupted exine layer which is commonly 0.7 μm to less than 2.0 μrn thick (3.2 μm inZingiber zerumbet, 2.5 μm inAmomum hypoleucum). Exine is spinose inAlpinia(smooth inAlpinia sanderae),AmomumandBoesenbergia, verrucose inEleltaria, tuberculate to areolate or striate inZingiber, papillose inGlobbaand smooth or nearly so inCurcuma, CostusandHedychiurn. Pollen grains are spheroidal, 50–90 μm in size (35 μm inGlobba ophioglossa), and inaparturate (foraminate inCostus), except inCurcumaandZingiberwhere they are ovoid to ellipsoidal, 70–135 times 60–80 μm in size and sulcate. A lamellated intine, much thicker than the exine, occurs in all, and it is thinner at the apertural region inCurcuma, CostusandZingiber;inElettariaandHedychiurnit is thinner in one or few large scattered circular areas, and inBoesenbergiaandAlpinia zerumbeton one side of the grains. PalynologirallyAlpinia, Amomum, Boesenbergia, KaempferiaandZingiberconstitute one group whileElettaria, HedychiurnandCostusconsti

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb00195.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

YUNUS, M., YUNUS, D&IQBAL, M., 1990.Systematic bark morphology of some tropical trees.Bark of 103 tropical trees of India has been examined from a systematic viewpoint and macroscopic features for use in field identification are considered. They are broadly categorized on the basis of diverse surface patterns and configurations as: deep fissured, shallow fissured, dippled, and entire. Identification of species is facilitated by the nature of the periderm and expansion tissue. The significance of bark anatomy in relation to systematics is discussed.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb00196.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY