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2 534629 Holothrix orthoceras (Harvey) Rchb.f. [80 1038664 Tryphia orthoceras Harvey]
I.B. Pole-Evans, E.P. Phillips, R.A. Dyer, L.E. Codd, Fl. Pl. S. Afr., vol. 37 : t. 1469 (1965) [vanderMerwe]
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