Henry N. Ridley

Bio: Henry N. Ridley is an academic researcher. The author has contributed to research in topics: Flora. The author has an hindex of 3, co-authored 3 publications receiving 338 citations.

The flora of the Malay Peninsula.

Abstract: VOL. 1 of this series was noticed in NATURE of January 6, 1923, p. 6. Of Vols. 2 and 3 which have now appeared, the former deals with the Gamopetalae from Caprifoliaceae to Labiatae, and the latter with the Apetalae from Nyctagineae to Salicinese. The arrangement of the natural families is that of the “Genera Plantarum “except that in the second volume the Plantagineae are inserted after the Plumbagineae, and the Cardiopteridae after the Convolvulacese. In the third volume the Aristolochiaceae and Nepenthaceae are transposed, the Hernandiaceas are separated from the Laurineae and the Opiliaceae are included. The Urticaceae are, however, still retained as one general family.The Flora of the Malay Peninsula.By Henry N. Ridley. (Published under the Authority of the Government of the Straits Settlements and Federated Malay States.) Vol. 2: Gamopetalæ. Pp. vi + 672. Vol. 3: Apetalæ. Pp. vi + 406. (London: L. Reeve and Co., Ltd., 1924.) 42s. net each vol.

Plant Resources of South-East Asia

Abstract: summarize knowledge about useful plants for workers in education, research, extension and industry. The following institutions are reponsible for the coordination of the Prosea Programme and the handbook: Forest Research Institute of Malaysia (FRIM), Karung Berkunci 201, Jalan FRI Kepong, 52109 Kuala Lumpur, Malaysia Indonesian Institute of Sciences (LIPI), Widya Graha, Jalan Gatot Subroto 10, J akar ta 12710, Indonesia Institute of Ecology and Biological Resources (IEBR), Nghia Do, Tu Liem, Hanoi, Vietnam Papua New Guinea University of Technology (UNITECH), Private Mail Bag, Lae, Papua New Guinea Philippine Council for Agriculture, Forestry and Natural Resources Research & Development (PCARRD), Los Bahos, Laguna, the Philippines Thailand Institute of Scientific and Technological Research (TISTR), 196 Phahonyothin Road, Bank Khen, Bangkok 10900, Thailand Wageningen Agricultural University (WAU), Costerweg 50, 6701 BH Wageningen, the Netherlands

Mabberley's plant-book: a portable dictionary of plants, their classifications and uses.

Abstract: Introduction How to use this book The dictionary Appendix Acknowledgement of sources Abbreviations and symbols (used in this book).

Phylogeny of the core Malvales: evidence from ndhF sequence data.

Abstract: The monophyly of the group comprising the core malvalean families, Bombacaceae, Malvaceae, Sterculiaceae, and Tiliaceae, was recently confirmed by molecular studies, but the internal structure of this clade is poorly understood. In this study, we examined sequences of the chloroplast ndhF gene (aligned length 2226 bp) from 70 exemplars representing 35 of the 39 putative tribes of core Malvales. The monophyly of one traditional family, the Malvaceae, was supported in the trees resulting from these data, but the other three families, as traditionally circumscribed, are nonmonophyletic. In addition, the following relationships were well supported: (1) a clade, /Malvatheca, consisting of traditional Malvaceae and Bombacaceae (except some members of tribe Durioneae), plus Fremontodendronand Chiranthodendron, which are usually treated as Sterculiaceae; (2) a clade, /Malvadendrina, supported by a unique 21-bp (base pair) deletion and consisting of /Malvatheca, plus five additional subclades, including representatives of Sterculiaceae and Tiliaceae, and Durionieae; (3) a clade, /Byttneriina, with genera traditionally assigned to several tribes of Tiliaceae, plus exemplars of tribes Byttnerieae, Hermannieae, and Lasiopetaleae of Sterculiaceae. The most striking departures from traditional classifications are the following: Durio and relatives appear to be more closely related to Helicteres and Reevesia (Sterculiaceae) than to Bombacaceae; several genera traditionally considered as Bombacaceae (Camptostemon, Matisia, Phragmotheca, and Quararibea) or Sterculiaceae (Chiranthodendron and Fremontodendron) appear as sister lineages to the traditional Malvaceae; the traditional tribe Helictereae (Sterculiaceae) is polyphyletic; and Sterculiaceae and Tiliaceae, as traditionally circumscribed, represent polyphyletic groups that cannot sensibly be maintained with their traditional limits for purposes of classification. We discuss morphological characters and conclude that there has been extensive homoplasy in characters previously used to delineate major taxonomic groups in core Malvales. The topologies here also suggest that /Malvatheca do not have as a synapormophy monothecate anthers, as has been previously supposed but, instead, may be united by dithecate, transversely septate (polysporangiate) anthers, as found in basal members of both /Bombacoideae and /Malvoideae. Thus, ‘‘monothecate’’ anthers may have been derived at least twice, independently, within the /Bombacoideae (core Bombacaceae) and /Malvoideae (traditional Malvaceae).

Toxicity of cycads

Abstract: This is a review of the literature on the use of cycads as food and medicine, with special attention to their toxic properties. In the tropics and subtropics, where the plants are indigenous, their toxicity has long been known. Both gastrointestinal and neurological effects have been reported. Although several toxic components of the plants have been investigated, none has yet been shown to be responsible for specific effects. No lesion has been demonstrated to account for the progressive and apparently irreversible posterior paralysis which reputedly follows consumption of the plants by cattle. Current interest in the toxicity of the cycads has been stimulated by recognition of the high incidence of neurological diseases in an area of the world where they are used as food.