1	"Key to species based on floral, fruiting and vegetative features."	2
1	"*Key to species based on seed and capsule characters."	13
2	"Capsules 4-valved; stigmas 4."	3
2	"Capsules 3-valved or with a terminal pore; stigmas 3."	4
3	"Prostrate to decumbent herb with stems to 40 cm long; leaves basal and on flowering stems; stamens 6–11; seeds with 6–10 concentric ribs."	"Calandrinia ptychosperma"
3	"Prostrate herb with stems to 5 cm long; leaves all basal; stamens 4–6; seeds with colliculate to papillate testa."	"Calandrinia sp. a sensu harden (1990)"
4	"Capsules obpyriform, opening by a terminal pore; seeds 2, superposed; petals to 1.5 mm long."	"Calandrinia disperma"
4	"Capsules ovoid or globose, opening by valves; seeds >10, not superposed; petals >1.5 mm long."	5
5	"Basal leaves usually >5 cm long; stamens >20; petals usually >5 mm wide."	6
5	"Basal leaves usually <5 cm long; stamens <20; petals usually <5 mm wide."	7
6	"Stigmas sessile on the ovary; capsules 5–6 mm long; seeds lenticular, smooth, c. 0.5 mm diameter."	"Calandrinia remota"
6	"Stigmas on a style 2–3 mm long; capsules 7–9 mm long; seeds reniform, colliculate, >1 mm long."	"Calandrinia balonensis"
7	"Capsules black, subglobose, trigonous, 1.5–2.2 mm long; sepals not persistent."	"Calandrinia granulifera"
7	"Capsules light brown, ovoid or globose but not trigonous, usually >2 mm long; sepals persistent."	8
8	"Leaves all basal, petiolate; capsules globose, circumsciss at the base, pericarp membranous."	"Calandrinia pumila"
8	"Leaves basal and on flowering stems, usually sessile; capsules ovoid, not circumsciss, pericarp crustaceous."	9
9	"Valves of capsules not persistent; seeds papillate-punctate; stamens 4–6."	"Calandrinia pickeringii"
9	"Valves of capsules persistent; seeds smooth, colliculate or papillate, not punctate; stamens usually >6."	10
10	"Petals 7–10 mm long; capsules 7–9 mm long, with acuminate, recurved valves; seeds flattened at the margins; leaves subsessile or petiolate."	"Calandrinia menziesii"
10	"Petals to 7 mm long; capsules to 7.5 mm long, with obtuse, incurved or involute valves; seeds not flattened at margins; leaves sessile."	11
11	"Seeds 10–20, lenticular, smooth to faintly colliculate; petals 2–3 mm long."	"Calandrinia calyptrata"
11	"Seeds >20, reniform, colliculate to papillate; petals usually longer than 3 mm."	12
12	"Inflorescences twining; fruiting pedicels curved upwards; capsules 5.5–7.5 mm long; seeds without a coppery lustre."	"Calandrinia volubilis"
12	"Inflorescences straight (not twining); fruiting pedicels straight, reflexed; capsule 3–5 mm long; seeds with a coppery lustre."	"Calandrinia eremaea"
13	"Seeds 2, superposed, dark red-brown to black, colliculate to papillate near the hilum, upper seed ovoid, 1.5–1.8 mm long, 0.7–0.8 mm diameter, lower seed subrhomboidal, 1.4–1.5 mm long, 1–1.2 mm diameter."	"Calandrinia disperma"
13	"Seeds ≥10, usually >20, not superposed."	14
14	"Seeds lenticular."	15
14	"Seeds reniform or obovoid, numerous."	17
15	"Seeds black, flattened towards the margin, 1.4–1.7 mm diameter, colliculate, numerous."	"Calandrinia menziesii"
15	"Seeds red-brown to dark brown, not flattened towards the margin, 0.5–0.7 mm diameter, smooth to faintly colliculate."	16
16	"Seeds 10–20, smooth to faintly colliculate; capsules 2–3.6 mm long."	"Calandrinia calyptrata"
16	"Seeds numerous, smooth; capsules 5–6 mm long."	"Calandrinia remota"
17	"Seeds reniform."	18
17	"Seeds obovoid."	20
18	"Seeds 1–1.3 mm long, c. 0.8 mm wide, colliculate, black or dark red-black."	"Calandrinia balonensis"
18	"Seeds to 0.7 mm long, colliculate to papillate or papillate, red-brown, dark brown, grey or black, sometimes with a coppery lustre."	19
19	"Seeds colliculate to papillate, 0.4–0.7 mm wide, red-brown, grey or rarely black, with a coppery lustre; fruiting pedicels straight, reflexed."	"Calandrinia eremaea"
19	"Seeds papillate all over, c. 0.6 mm long, 0.6 mm wide, dark brown to black, without coppery lustre; fruiting pedicels curved upwards."	"Calandrinia volubilis"
20	"Seeds with 6–10 concentric ribs, 0.5–0.7 mm long, 0.4–0.6 mm diameter, black or rarely dark red-brown."	"Calandrinia ptychosperma"
20	"Seeds colliculate to papillate-punctate, never ribbed, dark brown or red-brown to black."	21
21	"Seeds smooth to colliculate, light red-brown; capsules globose or trigonous."	22
21	"Seeds colliculate to papillate or papillate-punctate, dark red-browwn to black; capsules ovoid."	23
22	"Seeds colliculate, c. 0.5 mm long, 0.4 mm diameter, capsules black, dehiscing through short valves at the apex; sepals not persistent."	"Calandrinia granulifera"
22	"Seeds smooth to colliculate, 0.4–0.5 mm long, 0.3 mm diameter; capsules light brown, 2.6–3.5 mm long, circumsciss at base; sepals persistent."	"Calandrinia pumila"
23	"Seeds colliculate to papillate, c. 0.5 mm long, 0.5 mm diameter; capsules >4 mm long, 4-valved, valves persistent."	"Calandrinia sp. a sensu harden (1990)"
23	"Seeds papillate-punctate, c. 0.7 mm diameter; capsules <3 mm long, 3-valved, valves not persistent"	"Calandrinia pickeringii"