R[adcliffe-]Smith, A. (1971a). Dorstenia gigas. Moraceae. pp 4; 1 colour plate; artist E. Margaret Stones. Curtis's Botanical Magazine 178(3) : t.596[771]

R[adcliffe-]Smith, A. (1971aa). Tropical African Plants: XXXI. Scrophulariaceae - Compylanthus spinosus Balf. f. var. kuriensis A.R. Sm., var. nov. Kew Bulletin 25(2): 189.[772]

R[adcliffe-]Smith, A. (1971b). Lochia kuriensis A.R. Smith. Illecebraceae. Tribus Paronychieae. pp 2; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4) : t.[773]

R[adcliffe-]Smith, A. (1971c). Cissus Hamaderohensis A.R. Smith. Vitidaceae. pp 2; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3678.[774]

R[adcliffe-]Smith, A. (1971d). Lannea transulta (Balf. f.) A.R. Smith. Anacardiaceae. Tribus Anacardieae. pp 2; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3679.[775]

R[adcliffe-]Smith, A. (1971e). Peucedanum cordatum Balf. f. Umbelliferae. Tribus Peucedaneae. pp 2; 1 line drawn plate, artist probably Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3680.[776]

R[adcliffe-]Smith, A. (1971f). Canthium socotranum A.R. Smith. Rubiaceae. Tribus Vanguerieae. p 1; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4) : t.[777]

R[adcliffe-]Smith, A. (1971g). Jaubertia putorioides A.R. Smith. Rubiceae. Tribus Spermacoceae. p 1; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3682.[778]

R[adcliffe-]Smith, A. (1971h). Sideroxylon discolor A.R. Smith. Sapotaceae. pp 2; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3684.[779]

R[adcliffe-]Smith, A. (1971i). Curroria macrophylla A.R. Smith. Periplocaceae. pp 2; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3685.[780]

R[adcliffe-]Smith, A. (1971j). Mitolepis arbuscula A.R. Smith. Periplocaceae. pp 1; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3686.[781]

R[adcliffe-]Smith, A. (1971k). Kichxia Kuriensis A.R. Smith. Scrophulariaceae. Tribus Abtirrhineae. p 1; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3689.[782]

R[adcliffe-]Smith, A. (1971l). Clerodendrum leucophloeum Balf.f. Verbenaceae. Tribus Viticeae. pp 2; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3691.[783]

R[adcliffe-]Smith, A. (1971m). Plectranthus socotranus A.R. Smith. Labiatae. Tribus Ocimoideae. p 1; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3692.[784]

R[adcliffe-]Smith, A. (1971o). Aerva revoluta Balf. f. Amaranthaceae. Tribus Amarantheae. pp 2; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3695.[785]

R[adcliffe-]Smith, A. (1971p). Euphorbia hajhirensis A.R. Smith. Euphorbiaceae. Tribus Euphorbieae. p 1; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3696.[786]

R[adcliffe-]Smith, A. (1971q). Andrachne schweinfurthii (Balf. f.) A.R. Smith. Euphorbiaceae. Tribus Phyllantheae. p 2; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3697.[787]

R[adcliffe-]Smith, A. (1971r). Meineckia filipes (Balf. f.) A.R. Smith. Euphorbiaceae. Tribus Phyllantheae. p 1; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3698.[788]

R[adcliffe-]Smith, A. (1971s). Croton pachyclados A.R. Smith. Euphorbiaceae. Tribus Crotoneae. pp 2; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3699.[789]

R[adcliffe-]Smith, A. (1971t). Dipcadi guichardii A.R. Smith. Liliaceae. Tribus Scilleae. p 1; 1 line drawn plate, artist Mary A. Grierson. Hooker's Icones Plantarum, 5th Series, 7(4): t. 3700.[790]

R[adcliffe-]Smith, A. (1971u). Tropical African Plants: XXXI. Violaceae - Hybanthus enneaspermus (L.) F. Muell. Kew Bulletin 25(2): 173.[791]

R[adcliffe-]Smith, A. (1971v). Tropical African Plants: XXXI. Hypericaceae - Hyericum sp. nov. aff. H. scopulorum Balf. f. Kew Bulletin 25(2): 173-174.[792]

R[adcliffe-]Smith, A. (1971w). Tropical African Plants: XXXI. Anacardiaceae - Lannea ornifolia (Balf. f.) Engel. var glabra A.R. Sm., var. nov. Kew Bulletin 25(2): 173-174.[793]

R[adcliffe-]Smith, A. (1971x). Tropical African Plants: XXXI. Rubiaceae - Gaillonia tinctoria Balf. f. Kew Bulletin 25(2): 186.[794]

R[adcliffe-]Smith, A. (1971y). Tropical African Plants: XXXI. Plumbaginaceae - Limonium sokotorum (Vierh.) A.R. Sm., comb. nov. Kew Bulletin 25(2): 188.[795]

R[adcliffe-]Smith, A. (1972). Ruellia insignis. Acanthaceae. pp 3; 1 colour plate; artist E. Margaret Stones. Curtis's Botanical Magazine 178(4): t. 612.[796]

R[adcliffe-]Smith, A. (1987). Flora of Tropical East Africa. Euphorbiaceae (Part 1). Prepared ot the Royal Botanic Gardens/Kew with assistance from the East African Herbarium. FTEA Editor: R.M. Polhill. ISBN 90-6191-332-2; pp 407; 75 line drawings, artists Judy C. Dunkley, Christine Grey-Wilson, Mary A. Grierson, Pat Halliday, Olive Milne-Redhead, G. Papadopoulos, Mary Millar Watt. See pp 51-52, 68-70 figure 7. Published on behalf of the East African Governments. Rotterdam/Boston: A.A. Balkema.[797]

Radcliffe-Smith, A. (1973). An account of the genus Cephalocroton Hochst. (Euphorbiaceae). See p 131. Kew Bulletin 28(1): 123-132.[798]

Radcliffe-Smith, A. (1973a). Kalanchoe robusta. Crassulaceae. pp 3; 1 colour plate, artist E. Margaret Stones. Curtis's Botanical Magazine 179(4): t. 657.[799]

Radcliffe-Smith, A. (1973a). Trichodesma scottii. Boraginaceae. pp 5; 1 colour plate. Curtis's Botanical Magazine 181(3): t. 732.[800]

Radcliffe-Smith, A. (1991). Notes on Arabian Euphorbiaceae III. A new Jatropha from former South Yemen. 1 line drawing, artist Christine Grey-Wilson. Kew Bulletin 46(2): 327-329.[801]

Radcliffe-Smith, A. (1992). Dirachma soctrana. Oryx; Journal of the Fauna Preservation Society 26(3): 235. NB: Prior to 1973, A. Radcliffe-Smith published under the name 'A.R. Smith'.[802]

Radcliffe-Smith, A. (1992). The botany of Socotra. In Socotra. Island of tranquility. By Brian Doe. pages 189-204 including 11 full page botanical drawings by Mary A. Grierson. London: Immel Publishing Limited.[803]

Raimondo, F.M., Rossitto, M. and Sortoni, G. (1981). Additional records for the flora of Somalia. 2 photographs of herbarium specimens. Webbia 35(1): 207-222.[804]

Raisin, C.A. (1888). On some rock-specimens from Socotra. Geological Magazine, New Series (Decade 3) 5: 504-507.[805]

Randall, J.E. (1980). Revision of the fish genus Plectranthias (Serranidae, Anthiinae) with descriptions of 13 new species. Micronesica. Journal of the University of Guam 16(1): 101-187. F,W,Z[806]

Ravenstein. E.G. (1876). Sokotra. [Plus map at 1:300,000 scale]. The Geographical Magazine 3 (May 1876): 119-124.[807]

Rawson, R.W. (1885). European territorial claims on the coasts of the Red Sea, and its southern approaches, in 1885. Proceedings of the Royal Geographical Society, New Series, 7(2): 93-119.[808]

Ray, Himanshu Prabha (2003). The Archaeology of Seafaring in Ancient South Asia (Cambridge World Archaeology). Cambridge University Press , pps 350 ISBN-10: 0521011094 ISBN-13: 978-0521011099 [1178]

Rebel, H. (1899). Diagnosen neuer Lepidopteren aus Südarabien und von der Insel Sokotra. Anzeiger der Akademie der Wissenschaften, Wien 36: 359-361.[1104]

Rebel, H. (1907). Lepidopteren aus Südarabien und von der Insel Sokotra. Denkschriften der Kaiserlichen Akademie der Wissenschaften, Wien, Mathematisch-naturwissenschaftliche Klasse 71: 31-130.[1105]

Rebel, H. (1931). Zoologische ergebnisse der Expedition der Kaiserlichen Akademie der Wissenschaften nach Sudarabien und Sokotra im jahre 1898/99. Lepidopteren. 41 text figures; 1 plate. Denkschriften der Kaiserlichen Akademie der Wissenschaften in Wien. Mathematisch - Naturwissenschatliche Klasse. Band 71(2): 31-130. NB: Halband II of Band 71 was not published until 1931 even though the papers it contains were delivered at the academy in the first decade of the 20th Century.[809]

Reddy, K.B. (1986). Part II. Plants of Socotra. In Contributions to the flora and fauna of Peoples' Democratic Republic of Yemen: 97-108. ISBN 84-86284-08-2. Aden: Faculty of Education, University of Aden.[810]

Reynolds, G.W. (1966). The aloes of tropical Africa and Madagascar. pp xxii + 537; 106 colour plates. Mbabane, Swaziland: The Trustees, The Aloes Book Fund.[811]

Reynolds, T. (1985a). The compounds in Aloë leaf exudates: a review. Botanical Journal of the Linnean Society of London 90(3): 157-177.[812]

Reynolds, T. (1985b). Observation on the phytochemistry of the aloe leaf-exudate compounds. 2 figures. Botanical Journal of the Linnean Society of London 90(3): 179-199.[813]

Ricardo, Gertrude and Theobald, F.V. (1903). Arthropoda. Insecta: Diptera. Flies: 359. I. The flies of Sokotra: 359-374. Culicidae. By F.V. Theobald. See pp 359-361. II. The flies of Abd-el-Kuri: 375-376. Colour Plate XXII - Flies from Sokotra and Abd-el-Kuri. Depicts 11 species; artist Horace Knight. In Natural history of Sokotra and Abd-el-Kuri. Editor: Henry O. Forbes. Bulletin of the Liverpool Museums (Special Bulletin): 357-378.[814]

Richards, O.W. (1984). Insects of Saudi Arabia. Hymenoptera: Fam. Masaridae (The Arabian species). Fauna of Saudi Arabia 6: 413-440.[1097]

Rickards, A.R.M. (1948). By dhow along the Hadhramaut coast to Dhofar and a visit to Socotra. Typescript; pp 29; 17 photographs in 9 plates. In two parts: Part 1: By dhow along the Hadhramaut coast to Dhufar. pp 1-17; 12 photographs in Plates 1-6. Part 2: Notes on the island of Socotra. pp 18-29; 5 photographs in Plates 7-9. Coral Gables, Florida: Miscellanea Asiatica Orentalis Series. American Documentation Institute Microfilm (ADIM) No. 2347. Washington D.C.: Library of Congress.[815]

Ridley, H.N. (1886). On the freshwater Hydrocharideae of Africa and its islands. Plain Plate Xii - Bootia exserta, Ridley, artist Sir John Kirk. Plain Plate XIV - Blyxia radicans, Ridley, artist J.N. Fitch. See pp 232 & 236. Journal of the Linnean Society (Botany), London 22(5; No. 145): 232-240.[816]

Ridley, H.N. (1930). The dispersal of plants throughout the world. pp xx + 744. See pp 47, 161. Ashford, Kent: L. Reeve & Co., Ltd.[817]

Ripley, S.D. and Bond, G.M. (1966). The birds of Socotra and Abd-el-Kuri. 8 photographs; 1 map. Smithsonian Publication 4681. Smithsonian Miscellanious Collection 151(7): 1-37. Washington D.C.: Smithsonian Institution.[820]

Ripley, S.D. (1954). Comments on the biography of Arabia with particular reference to birds. Journal of the Bombay Natural History Society 52: 241-248.[818]

Ripley, S.D. (1966). Le martinet pale de Socotra (Apus pallidus berliozi subsp. nov.). L'Oiseau et la Revue Française d'ornithologie 35 (no. special): 101-102.[819]

Robertson, I. (1994). Socotra (Yemen). Bulletin of the African Bird Club 1(1): 30.[821]

Robinson, P. (1878a). Cyprus and Sokotra: "The New Colony," and " The New Field for Missionary Enterprise"; their physical, commercial, economic, historical and social aspects. - With a supplement specially treating of Cyprus as an opening for colonists and merchants, and embodying information recieved up to the last date. With summary of telegraphic intelligence of events in the islands. pp 50; 2 maps (Sokotra at 1:730,000). See pages 41-50. London: William Clowes and Sons.[822]

Robinson, P. (1878b). Socotra, the New Field for Missionary and Commercial Enterprise. pp 12; 1 map (1;730,000). London: William Clowes and Son.[823]

Robson, N.K.B. (1957). The genus Hypericum in Africa South of the Sahara, Madagascar and the Mascarenes. 2 maps; 2 tables. See pp 433, 443-445. Kew Bulletin 1957(3): 433-446.[824]

Robson, N.K.B. (1985). Studies in the genus Hypericum L. (Guttiferae) 3. Sections 1. Campylosporus to 6a. Umbraculoides. 24 line drawings, artist Margaret Tebbs; 34 maps (Map 4 - Socotra). See pages 192-194.[825]

Robson, N.K.B. (1987). An Iranian floristic link with Socotra, South Yemen, in Hypericum (Hypericaceae). Plant Systematics and Evolution 155(1-4): 89-92.[826]

Robson, N.K.B. (1993). Studies in the Hypericum: validation of new names. See p 68: Hypericum frieriense N. Robson, sp. nov. Bulletin of the Natural History Museum (Botany), London 23(2): 67-70.[827]

Roe, Sir Thomas (1811). The journal of Sir Thomas Roe, Ambassador from His Majesty King James the First of England, to Jehan Guire, the Mighty Emperor of India, commonly called the Great Mogol. Containing an account of his voyage to that country, and his observations there. Taken from his original manuscript. In Pinkerton (1811): A general collection of the best and most interesting voyages and travels in all parts of the world. Volume 8. pp 1-56. [pp 3-5 are concerned with Sir Thomas Roe's visit to Socotra from 24 to 31 August, probably in 1615]. London: Longman, Hurst, Rees, Orme and Brown.[828]

Rosen, B.R. (1971). The distribution of reef coral genera in the Indian Ocean. 1 figure; 7 maps; 3 tables. In Regional variation in Indian Ocean coral reefs, Editors: D.R. Stoddart and C.M. Yonge. ISBN 0-12-613328-X; pp xxxvi + 584. Symosia of the Zoological Society of London 28: 263-299. London: Academic Press.[829]

Rosler, H. and Wranik, W. (1998). Untersuchungen zur Herpetofauna der Republik Jemen. 2. Gekkonidae des sudlichen Jemen und der Insel Sokotra. Faunist. Abh. Staatl. Mus. Tierkunde Dresden 21/Suppl.: 113-132.[1111]

Rossija (SSSR) v lokalnykh vojnakh i vojennykh konfliktakh vtoroj poloviny XX veka.(2000).Edited by V.A.Zolotarjov. Kuchkovo Pole; Poligrafresursy (Moscow). pps 181,257,260-261. In Russian [1155]

Roth, E, (1889). Balfour, Isaac Bayley: Botany of Socotra, - The Transactions of the Royal Society of Edinburgh vol. XXXI. Edinburgh 1888. 4º LXXV and 446 p., 1 Karte und 100 Tafeln. [A review of the book and summary of the findings]. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie herausgegeben von A. Engler 9(3; Litteraturbericht): 45-47. Leipzig: Wilhelm Engelmann.[830]

Roti-Michelozzi, C.G. (1957). Adumbratio Florae Aethiopicae. Part 6. Caesalpiniaceae (excl. gen. Cassia). In Italian; 7 line drawings; 2 photographs (Tav. XXII-XXIII); 1 fold-out map. Webbia 13(1): 133-228.[831]

Royal Botanic Gardens, Kew/Threatened Plants Unit, World Conservation Monitoring Centre. (1990). World plant conservation bibliography. pp xvi + 645. London: World Conservation Monitoring Centre and Royal Botanic Gardens, Kew.[832]