| D. Stems creeping, or with creeping stolons. Achenes glabrotis, not muricate. | |
| Stems robust, branched, prostrate and rooting at the nodes. Leaves 3-toothed or -lobed. Scapes short, axillary | 28. R. Cheesemanii. |
| Stems weak, matted, often rooting at the nodes. Leaves tufted, trifoliolate; leaflets often again divided, small. Flowers minute | 29. R. ternatifolius. |
| Small, depressed, stoloniferous, 1½ in. high at most. Leaves ternatisect or multifid, segments narrow-linear. Scapes naked, 1-flowered; flower small | 30. R. depressus. |
| Small, much depressed, 1½ in. high at most. Rootstock creeping, much branched. Leaves cuneate. Scape 1-flowered; flower large | 31. R. pachyrrhizus. |
| Stems fistulose, creeping and rooting at the nodes. Leaves on petioles 6–18 in. long; blade 3–5-partite, 1–2½ in. diam., segments broad | 32. R. macropus. |
| Stems creeping and rooting at the nodes or floating. Leaves on petioles 1–6 in. long; blade 3–5-partite, 1¼–1½ in. diam., segments usually narrow | 33. R. rivularis. |
| Stems creeping and matted. Leaves small, 3-foliolate. Scapes shorter than the leaves, 1-flowered | 34. R. acaulis. |
| Stems creeping and rooting at the nodes. Leaves fleshy, reniform, 3-lobed or -partite | 35. R. crassipes. |
| Stems filiform, creeping and matted. Leaves linear-spathulate, entire. Flowers minute, tetramerous | 36. R. limosella. |
| E. Achenes muricate or tuberculate. | |
| Small, annual. Stems slender, branched. Flowers minute, almost sessile, opposite the leaves | 37. R. parviflorus, var. australis. |
1. R. Lyallii, Hook. f. Handb. N.Z. Fl. 4.—A tall, erect, exceedingly handsome plant, with a paniculately branched flowering-stem 1–4 ft. in height. Rootstock stout, with long fleshy roots. Radical leaves on long stout petioles with broad silky sheathing bases; limb 6–15 in. diam., orbicular, peltate, concave, crenate, coriaceous, glabrous or with a few weak hairs. Cauline leaves few, sessile, lower reniform, upper cuneate-rhomboid or oblong-cuneate, lobed and crenate. Leaves of young plants not peltate, reniform to rhomboid, cuneate at the base. Peduncles stout, villous, with 1–2 linear bracts. Flowers numerous, 2–3 in. diam., white, more rarely cream-coloured. Sepals 5, broad, villous. Petals usually numerous, cuneate-obovate, with an obscure gland at the base. Stamens many, short; anthers oblong. Receptacle oblong, cylindrical, hairy. Ripe achenes forming a head ¾ in. diam., oblique, turgid, villous, narrowed into long slender flexuous styles.—Bot. Mag. t. 6888; Kirk, Students' Fl. 7.
South Island: Abundant in the central and western portions of the Southern Alps, from the Spenser Mountains to the south of Otago. Stewart Island: Mount Anglem, Kirk. Altitudinal range from 2000 to 5000 ft. November–January. Var. Traversii: Hurunui Mountains, Canterbury, Travers.
