The five (or sometimes six) free petals are oval, much larger than the sepals, also overlap in the bud, but fall off after flowering, with a range in form that includes inverted egg-shaped. The petals are thick, cream to yellow in color, sometimes with a purple blush, and with an irregular pattern of brown or red veins. The ten free filaments are the same color as the petals, thick, gradually tapering upwards, 4-5¼ cm long, ½ cm broad, and carry facing the style an anther that is connected at midlength with the filament. The dark brownish anthers open with slits to the sides to release the cream-colored pollen. Pollen is triangular with very short slits at each of the corners and lacks further adornment. The outer margin of the disc is a very distinct narrow circular ridge-shaped nectar gland with ten side-ridges radiating out. The four to seven carpels are fused and carry a single, long, straight style which is topped by a lobed stigma. The style is not shed after flowering. Fruit and seed The fruit is a green globule of 7-7½ cm in diameter and 6-6½ cm high, with a woody consistence that does not open, and when it has disintegrated a skeleton of woody fibers remains. One seed may develop in each carpel. The seeds do not have wings, are not covered by an aril and are somewhat flattened, 10×8×3 mm. The ripe fruit smells of apples. Taxonomy Taxonomic history The species was initially described by Eugène Vieillard as Montrouziera robusta in 1874 in a book by Pancher and Sebert. Montrouziera however is a genus that belongs to the Guttiferae family. Henri Ernest Baillon in 1876 gave the same species another name: Strasburgeria calliantha. André Guillaumin realized both species were the same and should not be assigned to Montrouziera, so following the principle of priority according to the International Code of Nomenclature for algae, fungi, and plants he made the correct combination S. robusta in 1942. Dickison, who made a thorough redescription of the species, agrees with most earlier authors that Strasburgeria would probably be an early branch of the Theales, with many characters in common with the Ochnaceae, but also noted important differences such as a much more primitive anatomy of the wood and much further developed morphology of the pollen. Modern classification Recent genetic analysis revealed that Ixerba, an endemic of New Zealand, is closely