摘要:

The indigenous species of Pteridophyta known to occur in Ceylon number 314. In addition, 18 naturalized species occur as weeds of cultivation or as introduced aliens. Fifty‐seven species are endemic to Ceylon and 28 non‐endemic species are absent from India. Lists of these and other phytogeographical groupings are given. The full list of species is followed by comments on the taxonomy or nomenclature of 76 taxa. Four new combinations are made:Asplenium polyodonvar.bipinnatum(Sledge) Sledge;Deparia polyrhizon(Baker) Sledge;Polystichum harpophyllum(Zenker ex Kunze) Sledge, andBolbitis appendiculatavar.asplenifolia(Bory) Sledge.Athyrium puncticaule(Blume) T. Moore andA. lanceum(Kunze) T. Moore replaceA. anisopterumChrist andA. macrocarpum(Blume) Beddome, respectiv

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00357.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

The phenolic compounds of the leaf and bark ofMalusspecies have been examined. The dihydrochalcone phloridzin and a range of flavonoids occur in all barks, but eight compounds were found in only a limited number of species and their distribution shows a relationship with the taxonomy ofMalus, providing useful additional characters. The various proposed classifications ofMalusspecies are discussed in the light of this evidence and that of Rehder is found to be in best agreement except for his placing ofM'. florentinawhich, by its chemistry, is clearly related to the sectionDocyniopsis.The geographical distribution of the distinctive phenolics suggests a wide spreading of earlyMalusprobably from south‐east Asia as far as North America and a later diversification confined almost entirely to Eurasia. The different phenolic patterns are discussed and related to proposed phytogenies ofMalu

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00358.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

The mature stomatal morphology of 11 southern African speciesof Eugenia, and also ofE. unifloraL. (naturalized) andE. incertaDiimmer (a garden plant of unknown origin) has been studied by light and scanning electron microscopy.Leaves of all the species are hypostomatic and water‐stomata are occasionally present. Two different stomatal types, X and Y, differing mainly in their cuticular ornamentation, were found in the southern African species. The grouping of species based on stomatal characters supports a previous grouping of species on the basis of periderm and seed characters.Conspicuous lipid bodies, usually present in the subsidiary cells, are limited to the southern African species. Although the subsidiary cells do not differ in shape and size from adjacent epidermal cells, their contents often have a higher tannin content than ordinary epidermal cells. The variable patterns of arrangement of the three to five subsidiary cells makes it difficult to identify the stomata with existing classifications based on mature topography. Thus, a new term ‘anomostaurocytic’ is proposed for the stomatal type found in the southern African species.Stomata ofE. unifloraandE. incertaare paracytic and anomocytic respectively, and the cuticular ornamentation of their stomata differs from those of the southern African species. The view thatE. incertais not closely related to the southern African species is supported by differences in its cuticular ornamentation, lack of lipid bodies in the subsidiary cells, anomocytic stomata and prominent T‐pieces at the guard cel

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00359.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

The genera of the Veratreae, a tribe of the Melanthioideae, have many features in common: there are usually many ovules, except forAmianthium(with 2 4), arranged in 2 ‐4 longitudinal placental rows per carpel; all are bitegmic, basipetal, and campylotropous. Of 37 species examined, only 2 have open sutures at the lowermost level of ovular insertion, but 13 species have holes in the centre of the pistil. These holes may represent possible stages in the evolutionary closure of previously open sutures. Most flowers were epigynous, only 11 being hypogynous‐perigynous. The tribe as a whole is marked by the presence of 3 composite (heterologous) vascular bundles, composed of joined staminal and tepallary bundles alone and 3 composite bundles, as above, fused to a dorsal bundle. The bundles were united below the locular base in all genera exceptSchoenocaulonandToxicoscordion.Two major kinds of central cylinder arrangement occurred at the level of the lowermost ovular insertion: either 6 inverted ventral bundles or 6 simple septal bundles, with normally arranged (or sometimes inverted) xylem and phloem centrifugally located and 6 simple placental bundles, with inverted xylem and phloem, at the centripetal end of the septum. Generally each septal bundle united with its nearest adjoining placental bundle about the mid‐locular

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00360.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00357a.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY