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Showing papers in "Botanical Journal of the Linnean Society in 1978"


Journal ArticleDOI
TL;DR: It is suggested that the large diversity of characteristics promoting sexual polymorphism could justify the high and variable rates of mS met in natural conditions in T. vulgaris.

113 citations


Journal ArticleDOI
TL;DR: It isural selection which adjusts the percentage of male sterility in natural populations of Thymus uulgarii because the greater stability of itticultivated areas such as rocky sites allows for the maintenance of autogamy.

80 citations


Journal ArticleDOI
TL;DR: Studies on the growth of Archontophoenix cunninghamiana in two separate populations show that this species establishes only a narrow apical meristem complex before rising above ground, and this complex continues to expand in girth as it rises, until at a height of about 12 m its girth becomes fixed.

57 citations


Journal ArticleDOI
TL;DR: In this article, the authors reconstructed the changing postglacial vegetation of the region from macrofossils derived from deposits in the Cueva de Patagonia in southern Chile.

54 citations


Journal ArticleDOI
TL;DR: It is suggested that S. noctiflora evolved from a dioecious precursor of S. alba, the species to which it is most similar in morphology, distribution and habitat; hybrid sterility, even without incompatibility, would have assured mutual isolation.

50 citations


Journal ArticleDOI
TL;DR: This revision is based on work done in preparing an account of Euphrasia L. (Scrophulariaceae) for Flora Europaea, and uses the definition of Europe adopted there, but the two perennial species from the Azores are omitted.

45 citations


Journal ArticleDOI
TL;DR: General features of the flowers of the Alismatales are summarized in developmental fashion which includes the mature flower as a final stage, and all alismatalean flowers appear to be characterized by antipetalous stamen (or staminodial) paris.

45 citations


Journal ArticleDOI
TL;DR: Seeds closely resembling those of some species of the extant genus Rhododendron L. noV have been recovered from the Reading Beds near Newbury, Berkshire, and are assigned to Rhoddendron newburyanum sp.noV on the basis of detailed comparisons with seeds of extant Rhododendedron species, other Ericaceae, and taxa with similar morphology.

42 citations



Journal ArticleDOI
TL;DR: Two closely related species of the diatom genus Navicula were investigated using light and electron microscopy and a hitherto unrecorded structure associated with the raphe of N. delognei Van Heurck is described.

33 citations


Journal ArticleDOI
TL;DR: A new ontogenetics classification of stomatal types is proposed which replaces the three ontogenetic types of Pant (1965) with seven new ones and clearly differentiates between the developmental involvement of the subsidiary cells and the purely structural relationship of the neighbouring cells.

Journal ArticleDOI
TL;DR: Analysis of seeds of the H. murinum aggregate supported karyological results, suggesting that tetraploid and hexaploid plants are allopolyploids, and that one of their putative parents is a diploid known from Turkey and adventive in Australia.


Journal ArticleDOI
TL;DR: A survey of the pteridophytes of Mauritius is presented, including a summary of their habitats, ecology, and phytogeographical affinities.


Journal ArticleDOI
TL;DR: This method demonstrates that after the separation of the marine flora of South-West Africa (Namibia), two clearly defined groupings representing the eastern Atlantic and the western Atlantic are apparent.

Journal ArticleDOI
TL;DR: Thirteen of a group of 91 hybrids between Aloe rauhii and A. dawei contained either numerical or structural chromosome aberrations, and it is suggested that important genes governing the organization of the leaf epidermis are located in this region.

Journal ArticleDOI
TL;DR: The members of the genus Sonchus subgenus Dendrosonchus are woody perennials possessing the pachycaul construction which has been proposed as ancestral to that of modern trees and herbs as discussed by the authors.



Journal ArticleDOI
TL;DR: Enhanced protein and RNA contents have been found in the tapetum and sporogenous tissue at the time that the Tapetum becomes periplasmodial, and in both the stigma papillae cells and stigmatoid cells at maturity.

Journal ArticleDOI
TL;DR: A hybrid swarm between Acacia brachybotrya and A. calamifolia, involving plants referable to A. grayana, was studied in detail and confirmed as hybrids and other intermediate plants are determined as backcrosses to either parent.

Journal ArticleDOI
TL;DR: In this article, the main differential leaf and nodal anatomical characters of a number of artificial Ilex hybrids and their parents are compared and the marginal sclerenchyma strands are compared.

Journal ArticleDOI
TL;DR: The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous, and all are multiovulate, with bitegmic ovules.

Journal ArticleDOI
TL;DR: A colony of seven individuals of Tetrataxis, a monotypic endemic of Mauritius, has been discovered in a valley south-east of the type area, where it appears to have no close affinity to any single member of the family.

Journal ArticleDOI
TL;DR: The unique features of dinophycean nuclear division in confirmity with earlier findings are: chromosomes which remain condensed during mitotic cycle as in interphase, anaphasic separation of chromatids which is accomplished without the aid of a conventional spindle and chromosomes which do not reveal any centromeric organization.


Journal ArticleDOI
TL;DR: The arguments lor the conspecificity of the tetraploid taxa in VulPia section Vulpia sensu Cotton & Stace are discussed.

Journal ArticleDOI
T. B. B. Paddock1
TL;DR: On the basis of the general valve structure and of some rather unusual features which are described here for the first time, Plagiodiscus is confirmed as a genus separate from Surirella.