Table 4.

Revised key to New Zealand Crassula Section Helophytum

1.	Flowers often in small clusters in the leaf axils, sometimes solitary, inconspicuous; petals closely appressed to carpels or with spreading tips, usually < calyx lobes, sometimes equal to calyx lobes, or nearly so	Section Glomeratae
	Flowers always solitary in the leaf axils, conspicuous; petals spreading and corolla star-like, usually significant < calyx lobes, rarely nearly equal	2. Section Helophytum
2.	Leaves often >7 × 2 mm; flowers 4–7 mm diam.; plants terrestrial	C. moschata
	Leaves <7 × 1·6 mm; flowers < 4 mm diam.; plants aquatic to semi-aquatic, if terrestrial then leaves always smaller	3
3.	Plants strict summer annuals. Pedicels elongating to 13 mm long at fruiting; seeds >10 per follicle	C. peduncularis
	Plants perennial. Pedicels ≤7 mm long, scarcely elongating at fruiting; seeds ≤5 per follicle	4
4.	Leaves ± triangular-lanceolate, clustered and imbricate at stem nodes, acuminate, petals distinctly rounded	C. multicaulis
	Leaves linear to elliptic, or if ± lanceolate then not triangular lanceolate, usually opposite, occasionally clustered at stem nodes; petals obtuse, subacute to acute	5
5.	Petals 0·9–1·5 ± calyx lobes	6
	Petals 2–3 × calyx lobes	7
6.	Leaves (0·7–)2(–2·8) × (0·3–)0·6(–1) mm, not noticeably succulent; calyx lobes (0·5–)0·8(–1·6) mm long; petals equal to or 2 × width	C. ruamahanga
	Leaves (2·5–)8(–10) × 0·7–1·6 mm, obviously thick and succulent; calyx lobes 1–1·5 mm long, petals with length 1·7–1·8 × width	C. helmsii
7.	Plants mat forming but not obviously moss-like; leaves obtuse, subacute or sometimes ± apiculate, 1·5–5·5 × 0·8–1·7 mm; seeds 0·5–0·7 mm long	C. kirkii
	Plants forming fine moss-like mats; leaves ± acute, 0·5–2 × 0·2–0·5 mm; seeds 0·3–0·45 mm long	C. sinclairii