1	"Placentation parietal but sometimes close to base of ovary; ovules 2 to many, 1 or more per placenta; funicles not or scarcely longer than ovules erect or sometimes recurved"	2
1	"Placentation basal; ovules usually 2–4 (as many as there are style branches), rarely 4 or 5 (with funicle divided, carrying 2 ovules); funicles usually longer than ovules, erect at base, distally recurved"	32
2	"Leaves sessile or almost so"	3
2	"Leaves petiolate, the petiole often winged and ciliate"	15
3	"Bracteolar sheath surrounding calyx base and partly adnate to it, becoming leathery or woody in fruit"	4
3	"Bracteolar sheath forming small or shallow cup, not enclosing or attached to calyx"	5
4	"Leaves ovate, sometimes narrowly, the base cordate; calyx 5.5–9.5 mm long; desert species"	"Frankenia cordata"
4	"Leaves linear to lanceolate, the base rounded, never cordate; calyx 4.5–6 mm long; in coastal NW W.A."	"Frankenia ambita"
5	"Leaf lamina produced below point of attachment"	6
5	"Leaf lamina not produced below node"	8
6	"Leaf lamina below attachment shortly decurrent; ovules 8 or 9"	"Frankenia decurrens"
6	"Leaf lamina below attachment free, lobed; ovules 2–18"	7
7	"Leaves often spreading, 1–5 mm long; ovules 4–18"	"Frankenia cinerea"
7	"Leaves usually appressed, 2–4 mm long; ovules 2–7"	"Frankenia punctata"
8	"Flowers in dense head-like terminal dichasia"	"Frankenia conferta"
8	"Flowers in open or short dichasia or solitary, not head-like"	9
9	"Leaves spreading or reflexed, often broader and longer towards apex of shoot, densely pubescent, often white-encrusted or greyish"	10
9	"Leaves rarely spreading and if so glabrous, narrower towards apex of shoot"	12
10	"Ovules 1 or 2 on each of 2 or 3 parietal placentas"	"Frankenia sessilis"
10	"Ovules 3–13 on each of 3 parietal placentas"	11
11	"Erect or spreading small shrub; leaves 3–7 mm long; ovules 5–13 per placenta"	"Frankenia foliosa"
11	"Prostrate small shrub or cushion plant; leaves 1–3.5 mm long; ovules 3–5 per placenta"	"Frankenia muscosa"
12	"Leaves subsessile; ovules 8–16 per placentas"	"Frankenia irregularis"
12	"Leaves sessile; ovules 1–5 per placenta"	13
13	"Upper surface of leaves glabrous, shining"	"Frankenia tetrapetala"
13	"Upper surface of leaves scurfy or minutely pilose, dull or encrusted"	14
14	"Calyx densely puberulous"	"Frankenia sessilis"
14	"Calyx with scattered hairs, or ribs glabrous and grooves puberulous"	"Frankenia brachyphylla"
15	"Bracteolar sheath cupped, clasping calyx and often partially adnate to it"	16
15	"Bracteolar sheath small, if cupped then not adnate to calyx"	17
16	"Calyx 7–9.5 mm long; petals 12–16 mm long; ovules 1 or 2 per placenta"	"Frankenia cordata"
16	"Calyx 5–6 mm long; petals 6–8 mm long; ovules 6–13 per placenta"	"Frankenia cupularis"
17	"Calyx setulose-pilose in upper half, glabrous below"	"Frankenia parvula"
17	"Calyx pubescent to almost glabrous but never as above"	18
18	"Ovules l per placenta, attached in upper half of ovary; stems densely pubescent with thick, white recurved hairs"	"Frankenia crispa"
18	"Ovules more than l per placenta or, if 1, attached just above  ovary base; stems puberulous"	19
19	"Ovules l or 2 per placenta"	20
19	"Ovules 3 to many per placenta"	21
20	"Plant prostrate; leaves puberulous, the midrib usually  exposed"	"Frankenia densa"
20	"Dense, compact, small shrub; leaves glabrous, almost terete,  the midrib hidden"	"Frankenia plicata"
21	"Calyx densely hairy with spreading hairs to 1 mm long"	22
21	"Calyx glabrous or shortly pubescent or with scattered hairs"	23
22	"Leaves and bracts oblong, ovate or elliptic, most of  underside exposed"	"Frankenia hispidula"
22	"Leaves and bracts linear or oblong-linear, only midrib  exposed beneath"	"Frankenia magnifica"
23	"Upper surface of leaves, especially when young, and base  of calyx with appressed hairs"	"Frankenia adpressa"
23	"Leaves and calyx variously pubescent or glabrous but hairs  not appressed"	24
24	"Leaves oblong to ovate or obovate, more or less flat, or if margins recurved then undersurface exposed"	25
24	"Leaves oblong to linear, subterete, the lower ones  sometimes flattened but never obovate"	29
25	"Upper leaves with cordate bases; W.A."	"Frankenia confusa"
25	"Leaf bases not cordate; not W.A. species"	26
26	"Some hairs of stems and calyx hooked"	"Frankenia annua"
26	"Hairs of stems and calyx straight or curved but not hooked"	27
27	"Calyx to 4 mm long; petals to 4.5 mm long"	"Frankenia pulverulenta"
27	"Calyx 5–6 mm long; petals 6–10 mm long"	28
28	"Perennial, woody, leafy, dense; stems with  spreading or retrorse hairs"	"Frankenia pseudoflabellata"
28	"Annual, usually slender; stems puberulous"	"Frankenia orthotricha"
29	"Leaves appearing terete. midrib hidden below"	"Frankenia subteres"
29	"Leaves linear with margins revolute, midrib exposed  below; lower leaves sometimes flattened"	30
30	"Dichasia spreading; stems erect; bracts and bracteoles  to ⅓ length of calyx"	"Frankenia laxiflora"
30	"Dichasia short or dense, sometimes open but not spreading; bracts and bracteoles ⅓ length of calyx or more"	31
31	"Calyx 5–8 mm long; petals 6.5–12 mm long; upper  leaf-surface glabrous; lower leaves often flat"	"Frankenia pauciflora"
31	"Calyx 7–11 mm long; petals 13–18 mm long; upper  leaf-surface rough with minute hairs, gland-dotted"	"Frankenia fecunda"
32	"Flowers in dense, head-like dichasia"	33
32	"Flowers in loose or open dichasia, occasionally dense but not  head-like"	36
33	"Leaves mostly ovate to oblong with recurved margins"	"Frankenia serpyllifolia"
33	"Leaves mostly linear with revolute margins"	34
34	"Bracts and bracteoles broader than leaves, flat, lanceolate to ovate"	"Frankenia bracteata"
34	"Bracts and bracteoles similar to leaves, linear, subterete"	35
35	"Upper leaf-surface covered with fine bristles; calyx with fine  bristly hairs"	"Frankenia setosa"
35	"Upper leaf-surface glabrous; calyx glabrous or with few weak  hairs"	"Frankenia glomerata"
36	"Leaves subsessile"	37
36	"Leaves petiolate"	38
37	"Calyx glabrous or sparsely pubescent; leaves almost glabrous"	"Frankenia desertorum"
37	"Calyx and foliage tomentose with spreading or retrorse hairs"	"Frankenia interioris"
38	"Upper leaf-surface glabrous or almost so"	39
38	"Upper leaf-surface densely pubescent or pilose, sometimes  glabrescent with age"	43
39	"Stem, calyx and leaves never with hooked hairs"	40
39	"Stem or calyx or both, and rarely leaves, with hooked hairs"	41
40	"Plant procumbent, often rooting at the nodes, glabrous or with  few scattered hairs; stigma minute"	"Frankenia drummondii"
40	"Plant erect; stems densely pubescent; stigma linear, c. 1 mm long"	"Frankenia eremophila"
41	"Stamens 4"	"Frankenia georgei"
41	"Stamens 5 or 6"	42
42	"Stigmas linear; hairs of indumentum very short"	"Frankenia gracilis"
42	"Stigmas capitate; indumentum pilose becoming scabrid"	"Frankenia uncinata"
43	"Hairs on leaves and stems hooked"	"Frankenia Stuartii"
43	"Hairs on leaves and stems spreading, occasionally curved but rarely hooked"	44
44	"Hairs on leaves, stems and calyx bristly, to c. 1 mm long"	"Frankenia serpyllifolia"
44	"Hairs on leaves less than 0.5 mm long"	45
45	"Leaves and bracts broadly ovate, elliptic-ovate or  oblong-elliptic; lower leaves usually 4–8 mm wide; dichasia  dense"	"Frankenia serpyllifolia"
45	"Upper leaves and bracts linear or lanceolate, the lower  sometimes oblong or elliptic, 3 mm wide or less; dichasia  often loose and spreading"	46
46	"Calyx 6–10 mm long; stigma linear or filiform, 0.7–2 mm  long"	47
46	"Calyx 3–7 mm long; stigma capitate, clavate or linear, 0.3–1 mm long"	48
47	"All leaves linear or oblong-linear; stems and calyx ribs  densely puberulous"	"Frankenia connata"
47	"Lower leaves elliptic or oblong; stems puberulous; calyx  with spreading hairs 0.5–1 mm long"	"Frankenia latior"
48	"Leaves linear, subterete; stigma capitate, c. l mm diam."	"Frankenia scabra"
48	"Leaves linear to oblong-elliptic; stigma linear or clavate"	49
49	"Petals broadly spathulate, truncate at tip; stigma linear  or clavate, 0.2–0.5 mm long"	"Frankenia flabellata"
49	"Petals spathulate, rounded at tip; stigma linear, 0.3–1  mm long, c. half length of style branch"	"Frankenia serpyllifolia"