. Bulletin of the British Museum (Natural History) Botany. N. K. B. ROBSON. Fig. 40 Plan of toral vasculature of a 4-carpellary flower of H. natalense (sect. 26), showing that the trace to carpel 4 is derived from that of carpel 1 of a 3-carpellary gynoecium. organs. In smaller-flowered species (H. pulchrum (Figs 39, 47e) and H. aethiopicum subsp. sonderi), the vascular plan is essentially similar but simpler, as it is in the species with fasciclodes, H. aegypticum and H. elodes (Robson, 1972a : figs 8,9). (e) Sect. Humifusoideum Saunders (1937) investigated Hypericum peplidifolium because it
. Bulletin of the British Museum (Natural History) Botany. N. K. B. ROBSON. Fig. 40 Plan of toral vasculature of a 4-carpellary flower of H. natalense (sect. 26), showing that the trace to carpel 4 is derived from that of carpel 1 of a 3-carpellary gynoecium. organs. In smaller-flowered species (H. pulchrum (Figs 39, 47e) and H. aethiopicum subsp. sonderi), the vascular plan is essentially similar but simpler, as it is in the species with fasciclodes, H. aegypticum and H. elodes (Robson, 1972a : figs 8,9). (e) Sect. Humifusoideum Saunders (1937) investigated Hypericum peplidifolium because it was alleged to have three fascicles and five styles (Keller, 1925), which seemed to go against the trend of meiomery starting in the innermost organ. She claimed that all the flowers that she examined had five fascicles, not three; but Milne-Redhead (1953) described this species as having stamens 'usually in 3 often rather indefinite groups of 7-10, but sometimes totalling as many as 10'. H. peplidifolium is a relatively advanced, herbaceous member of sect. 26. Humifusoideum. When a more primitive, shrubby member (H. saruwagedicum) was studied, its toral vascula- ture was found to be essentially similar to that of//, goyanesii (see below, Fig. 45), with five distinct fascicle traces 'spread out' so that their branches form a more-or-less continuous row. This pattern reflects that of the stamens, which are 'irregular' or 'not in fascicles'. The gynoecium is trimerous. H. natalense is intermediate between H. saruwagedicum and H. peplidifolium in having, for example, a 4-5-carpellary gynoecium and stamens 'irregularly arranged in 3 or 4 indistinct groups' (Killick & Robson, 1976). Figure 40 shows that the grouping of the androecial traces is also indistinct, and that the fourth carpel is innervated by the division of the trace opposite sepal 1 (shaded area) of a 3-carpellary gynoecium. In H. peplidifolium (Fig. 41) this doubling process has been repeated opposite sepal 2
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