摘要:

The herbarium was established in 1840, with the personal herbarium of Thomas Coulter as its nucleus. Extensive purchases were made by him and by his successor, W. H. Harvey, whose personal herbarium was also incorporated. Harvey also received numerous donations, partly through his friendship with W. J. Hooker and Asa Gray, but also from his position as joint author ofFlora Capensis.After Harvey's death in 1866 growth continued at a slower rate till 1950, when it once more accelerated. The herbarium containsc.206000 specimens in all: 166000 seed plants, 8000 pteridophytes, 8000 bryophytes, 20 000 algae and 4000 lichens. An analysis of the geographical origin of the specimens is given, and a list of the chief collectors. The regions most fully represented are Europe (especially the west and south), India, South Africa, North and South America. There is relatively little from China and Tropical Africa. Among the largest collections are those of Spruce (Amazon and Andes), Harvey (world‐wide, especially Australian algae), A. F. G. Kerr (Thailand), Drege (South Africa) and Kotschy (Orient

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1991.tb02296.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Leaf anatomy is described in Ixioideae, the largest subfamily of Iridaceae, with particular reference to phylogeny and systematics. Leaves in many genera have two rows of opposing vascular bundles (found also in many other Iridaceae), sometimes (except in e.g.Pillansia)combined with typical ixioid features such as a prominent pseudomidrib, mesophyll cells often elongated at right angles to the leaf axis, and epidermal cells also sometimes slightly laterally elongated, frequently with markedly sinuous anticlinal walls, and a single row of papillae per cell. Other characters are limited to a few genera. Anatomical characters are used together with data from other sources to construct a cladogram for the group. Although anatomical characters in general show much homoplasy, the relationships of the existing three tribes, Pillansieae, Watsonieae and Ixieae, diagnosed mainly on the basis of floral and inflorescence characters, are largely upheld by analysis, with at least two potentially useful subtribal groupings within Ixieae.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1991.tb02297.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

A new taxonomic treatment of theFestuca ovinaL. aggregate (Poaceae) in the British Isles. A wide range of morphological, anatomical and cytological characters was collected and analysed by a variety of methods, some taxometric. As a result nine species are recognized in the British Isles, one(F. glaucaVill.) only as a garden plant and two(F. huoniiAuquier andF. armoricanaKerguélen) only in the Channel Isles. Two other species sometimes claimed for the British Isles(F. guestfalicaBoenn. ex Reichb. andF. indigestaBoiss.) are excluded for various reasons given. One species(F. ovinaL.) is divided into three subspecies: the diploid subsp.ovina(commonest in the north); and the tetraploid subsp.hirtula(Hackel ex Travis) M. Wilkinson (the commonest taxon of the aggregate in the British Isles) and subsp.ophioliticola(Kerguélen) M. Wilkinson (scattered throughout the British Isles, but commonest on chalk and limestone and not restricted to serpentine soils as once thought

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1991.tb02298.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY