Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a retraction,
withdrawal, or removal notice.
The 23 references without a DOI — listed, not checked
no DOI — not checkedAusten, E. E., 1909: Illustrations of African blood-sucking flies. ? London: British Museum.
no DOI — not checkedDarwin, C., 1877: The various contrivances by which British and foreign orchids are fertilised by insects. ? New York: Appleton.
no DOI — not checkedDeacon, H. J., Jury, M. R., Ellis, F., 1992: Selective regime and time. ? InCowling, R., (Ed.): The ecology of Fynbos: nutrients, fire and diversity, pp. 6?22. ? Cape Town: Oxford University Press.
no DOI — not checkedDierl, W., 1968: Zur Nahrungsaufnahme vonCorizoneura longirostris (Hardwicke). ? Ergebn. Forsch. Untern. Nepal-Himalaya3: 70?81.
no DOI — not checkedDressler, R. L., 1981: The orchids. ? Cambridge, London: Harvard University Press.
no DOI — not checkedFletcher, T. B., Son, S. K., 1931: A veterinary entomology for India, XIV. ? Indian J. Vet. Sci. Anim. Husbandry1: 192?199.
no DOI — not checkedGoldblatt, P., 1972: A revision of the generaLapeirousia Pourret andAnomatheca Ker in the winter rainfall region of South Africa. ? Contr. Bolus Herb.4: 1?111.
no DOI — not checked?, 1990: Pollination biology ofNivenia (Iridaceae) and the presence of heterostylous self-compatibility. ? Israel J. Bot.39: 93?111.
no DOI — not checked?, 1965: Flower pollination in thePhlox family. ? New York: Columbia University Press.
no DOI — not checkedJohnson, S. D., 1992: Plant animal relationships. ? InCowling, R., (Ed.): The ecology of Fynbos: nutrients, fire and diversity, pp. 175?205. ? Cape Town: Oxford University Press.
no DOI — not checked?, 1993: Beauty and the beast, a Cape orchid pollinated by horseflies. ? Veld & Flora79: 38?39.
no DOI — not checked?, 1995: Systematics and evolution of theDisa draconis complex(Orchidaceae). ? Bot. J. Linn. Soc.118: 289?307.
no DOI — not checkedLewis, G. J., 1959: The genusBabiana. ? J. S. African Bot. Suppl.3. ? Cape Town: National Botanical Gardens.
no DOI — not checked?, 1972:Gladiolus: a revision of the South African species. ? Cape Town, Johannesburg, London: Purnell.
no DOI — not checkedManning, J. C., Goldblatt, P., 1995: Cupid comes in many guises, the not-so-humble fly and a pollination guild in the Overberg. ? Veld & Flora81: 50?52.
no DOI — not checkedMarloth, R., 1908: Some observations on entomophilous flowers. ? S. African J. Sci.5: 110?113.
no DOI — not checkedSteiner, K. E., Whitehead, V. V., 1990: Pollinator adaptation to oil-secreting flowers ?Rediviva andDiascia. ? Evolution44: 1701?1707.
no DOI — not checkedOgden, E. C., Raynor, G. S., Hayers, J. V., Lewis, D. M., 1974: Manual of sampling airborne pollen. ? London: Hafner Press.
no DOI — not checkedVan Der Walt, J. J., 1977: Pelargoniums of southern Africa1. ? Cape Town: Purnell.
no DOI — not checked?, 1981: Pelargoniums of southern Africa2. ? Cape Town: Juta.
no DOI — not checked?, 1988: Pelargoniums of Southern Africa3. ? Cape Town: Kirstenbosch Botanical Garden.
no DOI — not checkedVogel, S., 1954: Blütenbiologische Typen als Elemente der Sippengliederung. ? Bot. Stud.1: 1?338.
no DOI — not checkedWhitehead, V. B., Giliomee, J. H., Rebelo, A. G., 1987: Insect pollination in the Cape Flora. ? InRebelo, A. G., (Ed.): A preliminary synthesis of pollination biology in the Cape Flora, pp. 52?82. ? Pretoria: CSIR.
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