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Genus Rumex L.
Rumex pachyperianthus n.sp. (Text-fig. 1, Figs. 4, 5.)
Outer portion of fruit, irregularly ovoid, base cuneate, apex acuminate, trigonous, faces flat to convex. Shortly pedunculate and dehiscing along angles, dehiscence extending three-quarters of length of fruit. Surface irregularly cristate. Wall 0.2 mm thick, amorphous in structure Interior smooth.
Measurements of twenty specimens:
| Average | Range | Holotype (B226/131) | |
| Length | 2.0 mm | 1 5–2.2 mm. | 2.2 mm. |
| Greatest Diameter | 1.5 mm. | 1.4–1.8 mm. | 1.5 mm. |
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Plate 1—Retouched photographs of fossil leaves from the Wanganui Series 1—Piper crenhou cusis nsp Holotype B163/30 × 2 2—Belulites couperi n.sp Holotyupe B163/9 × 2 3—Nothofagus searellae nsp B209/30 × 4 4—Nothotagus searellae nsp Holotype B206/7 × 4 5—Notholagus of Chifor fusea B206/2 × 3 6—Phyllires lamahsis nsp Holotype B209/1 × 3.
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Locality. Rangitawa Stm. B226/132–150 Paratypes.
This portion of a fruit is closest to the enlarged perianths of the Polygonaceae, and is similar to those of Rumex It is thicker than any named New Zealand species.
Text-Fig. 2 —Knightia fossilis Oliver. Sketch of B195/29 showing dentation (in solid line) exposed by further clearing. The outline used as a basis for Oliver's description is here shown dotted. (X 0 75). del W. P. T.