A comparative study was undertaken on the leaves and petioles of 16 species of Mallotics in order to investigate anatomical variations of potential in species identification. There is a range of characters which varies between species. These include the outline of the midrib and petiole in transverse sections, the shape of the vascular tissue in midribs, the presence of central bundles in the petiole, the presence of terminal sclereids, enlarged tracheids, presence or absence of non-glandular trichomes, and parenchymatous sheaths in vascular bundles. A combination of these characters may be used to identlfy species. Anatomical data support the placing of only a few species into the respective sections.
KHATIJAH, H. H., CUTLER, D. F. & MOORE, D. M., 1992. Leaf anatomical studies of Eugenia L. species from the Malay Peninsula. The leaf and petiole anatomy of 25 Malaysian species of Eugenia L. sensu lato was investigated to determine the value of vegetative anatomy for the identification of non‐flowering material. Twelve characters proved useful for the identification of species: type of stomata; shape of leaves in T.S.; shape of midrib bundle; sclerenchyma sheath; cutinization of outer epidermal wall; presence or absence of sclereids, idioblasts, hypodermis, columnar epidermal cells, solitary crystals; number of palisade layers and the shape of vascular strand, sclerenchyma sheath and sclereids in the parenchyma of the petiole. Using these characters an anatomical key was constructed to assist identification of the species. Only the closely related species E. stapfiana and E. nilidula could not be separated on anatomical characters. The anatomical data support the treatment of Henderson (1949) of section Acmena but not of sections Cleistocalyx and Fissicalyx, which fit better in section Syzygium.
BohnicalJournal of& Linnean Sock@ (2000) 133: 161-180. With 90 figures dot 10.1006/bojl. 1999.0308, available online at http://www.idealibrary.com on I a E @ Comparative leaf anatomy of AZpinia Roxb. species (Zingiberaceae) fkorn China KHATIJAH HAJI HUSSIN'*, CHUA TSE SENGI, HAIJJAH IBRAHIM2, WU QI GEN3, LIAO JING PING3 and LIU NUN3The leaf anatomy of 20 Alpinia species from China was investigated. Results show that there is interspecific variation in the structure of the leaf midrib and petiole which can be used for species identification. Adaxial hypodermis is present in the lamina in all species of subgenus Catimbium and absent from all species of subgenera hamalpinia and Aobolocahx and Alpiniu, excepting A. conchigera, A. galunga and A. aquatica, which appear to be closely allied in having subepidermal fibres in midribs and petioles, which are absent from the rest of the species.
A comparative study was undertaken on the leaves of 12 Sterculia species in order to assess anatomical variations which may be useful in species identification and to evaluate their significance in the taxonomy of the genus. All species have glandular and non-glandular trichomes, anomocytic stomata, multiple and mucilaginous epidermis, mucilaginous cavities and druses in mesophyll tissues. A small amount of variation was observed in the outline of transverse sections of midribs and petioles, the presence of central vascular bundles, and the type of trichomes. Some characters, such as the vertically divided adaxial epidermis in S. rnacrophylla, are unique to certain species and are therefore useful in diagnostic characters, while S. coccinea and S. elongata appear to be similar in the structure of the petiole and midrib. The results, however, do not show any groupings of species and do not support the observations of others on groups derived from wood anatomy.
Introduction. Seeds from Garcinia species are recalcitrant, which do not survive dessication and cold temperature. This poses a significant challenge for their long-term preservation, and hence more research is needed to understand the biology of such seeds. Materials and methods. Seeds from three under-investigated Garcinia species, namely G. atroviridis, G. hombroniana and G. prainiana, as well as the economically important mangosteen (G. mangostana), were studied using histochemical tests and microscopy techniques as well as moisture content and germination tests. Results and discussion. The seeds of these species varied in shape and size. G. hombroniana seeds were the largest, while those of G. prainiana were the smallest. Furthermore, during a period of desiccation, larger seeds (G. hambroniana and G. mangostana) retained their moisture content longer than the smaller seeds (G. atroviridis and G. prainiana). Consequently, species with larger seeds seemed to maintain a higher germination percentage compared with the species with smaller seeds. Moreover, G. prainiana seeds had the thickest testa, which perhaps underlay their significantly delayed germination time. Large amounts of lipid and calcium oxalate were also observed in all four Garcinia species, which may have a role in food storage and herbivore protection, respectively. During germination, all species had radicles and shoots emerged from two opposite ends, conforming to the Garcinia-type germination. The procambial tissues also increased in length during germination towards the ends where the radicle and plumule emerged. Conclusion. This study successfully characterised the seeds from four different Garcinia species, some of which are not yet reported elsewhere.
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