|4 (3)||Flowers white-pink or pale yellowish. Basal leaf blade up to 50 cm long but never exceeding; upper surface glabrous or papillose.||(5)|
|+||Flowers dark purple. Basal leaf blade up to 60 cm long; upper surface somewhat scabrous above.||1 R. australe|
|5 (4)||Fruits 13-15 mm across. Flowers white to pink.||6 R. wittrockii|
|+||Fruits 8-10 mm across. Flowers pale yellowish.||5 R. webbianum|
|30 (29)||Leaves with 5-7 basal veins; leaf blade narrowly triangular to broadly ovate, not cordate.||(31)|
|+||Leaves with 5 basal veins; leaf blade cordate or broadly ovate.||(32)|
|31 (30)||Perianth white-green or yellow-white; rachis of panicle papilliferous.||1 R. rhabarbarum|
|+||Perianth purple-red; rachis of panicle densely pubescent.||2 R. australe|
|32 (30)||Leaf blade reniform-cordate or cordate, usually shorter than wide; perianth yellow-white.||3 R. webbianum|
|+||Leaf blade ovate-cordate or broadly ovate, usually longer than wide; perianth green.||4 R. hotaoense|
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