Flora of New Zealand Series

waoriki

Perennial; rosettes tufted on long creeping stems. Basal lvs on stout erect petioles (7)-15-30-(40) cm long, arising from somewhat bulbous nodes; lamina ternate, glabrous, (1.5)-2-4 cm wide; leaflets sessile or shortly stalked, cuneiform, shallowly 3-fid, crenate or bluntly dentate at tips; lateral leaflets longer than terminal; cauline lvs few, similar to basal but smaller. Fls (1)-3-5 per stem, 10-15 mm diam.; pedicels glabrous. Sepals spreading or weakly recurved, glabrous. Petals 5-7, yellow, narrowly oblong, shortly clawed; nectary single, 1-1.5 mm from petal base, with a short semilunar scale. Receptacle with a basal collar of bristles. Achenes 15-50, hardly flattened, glabrous; body 1.5-2 mm long, slightly rugulose; beak straight, 1-1.5 mm long.

N.: from about Whangarei southwards; S.: Marlborough and Canterbury.

Endemic.

Slow-flowing streams, ponds and wet ground, mostly below 300 m.

R. macropus is similar to R. amphitrichus, but may be distinguished by its larger and more robust stature, lateral leaflets longer than the terminal, long and stout petiole, larger fls and more achenes. The stout fistular petioles become distinctively flattened in pressed specimens.