1	"Leaves segmented by transverse septa"	2
1	"Leaves not segmented by transverse septa"	3
2	"Inflorescence compound; stiff-leaved alpine or subalpine herbs"	Aciphylla
2	"Inflorescence simple; tender aquatic or semi-aquatic herbs"	"Lilaeopsis {Lilaeopsis polyantha}"
3	"Inflorescence of simple umbels or heads"	4
3	"Inflorescence compound, regularly or irregularly branched into many-flowered secondary umbels (umbellules)"	20
4	"Inflorescence a head surrounded by large or conspicuous involucral bracts"	5
4	"Inflorescence not surrounded by conspicuous involucral bracts"	7
5	"Involucral bracts stiff and mucronate"	Eryngium
5	"Involucral bracts leafy or petal-like"	6
6	"Fruits pubescent; mericarps smooth"	Actinotus
6	"Fruits glabrous; mericarps ribbed"	Xanthosia
7	"Leaves deeply dissected or compound"	8
7	"Leaves entire, but margins sometimes crenate or toothed"	13
8	"Leaves 1–3-pinnately dissected, with 5 or more pinnae"	9
8	"Leaves ternately or palmately dissected, or tripartite"	10
9	"Leaves basal, rarely cauline; mericarps not long-bristly, 5-ribbed"	Oreomyrrhis
9	"Leaves cauline; mericarps long-bristly, sometimes the inner ones tuberculate"	Torilis
10	"Stipules present, scarious"	Hydrocotyle
10	"Stipules absent"	11
11	"Simple leaves or leaflets filiform, terete"	Platysace
11	"Simple leaf and leaflet shape various but not filiform and terete"	12
12	"Sepals absent or minute; mericarps hairy, tuberculate or rarely indistinctly 5-ribbed"	Trachymene
12	"Sepals 1–3 mm long; mericarps 7–9 ribbed"	Xanthosia
13	"Plants with a fleshy taproot; leaves all basal, often rosetted; alpine or subalpine herbs"	14
13	"Plants without a fleshy taproot, rhizomatous or stoloniferous, or with erect and ascending branches; leaves cauline or produced at nodes"	16
14	"Leaves spathulate, toothed distally"	"Oschatzia {Oschatzia cuneifolia}"
14	"Leaves circular or ovate, margins crenate or entire"	15
15	"Leaves ovate, margins entire; stipules absent"	"Diplaspis {Diplaspis nivis}"
15	"Leaves more or less circular, margins crenate; stipules present, scarious"	"Schizeilema {Schizeilema fragoseum}"
16	"Stipules present, scarious"	Hydrocotyle
16	"Stipules absent"	17
17	"Plant with creeping rhizome rooting at nodes"	"Centella {Centella cordifolia}"
17	"Plant erect or semi-erect, not rooting at nodes"	18
18	"Simple leaves or leaflets filiform, terete"	Platysace
18	"Simple leaf and leaflet shape various but not filiform and terete"	19
19	"Sepals absent or minute; mericarps hairy, tuberculate or rarely indistinctly 5-ribbed"	Trachymene
19	"Sepals 1–3 mm long; mericarps 7–9 ribbed"	Xanthosia
20	"Fruit with a conspicuous beak 2–7 cm long"	"Scandix {Scandix pecten-veneris}"
20	"Fruit without a beak or beak less than 1 cm long"	21
21	"Leaves peltate"	Hydrocotyle
21	"Leaves not peltate"	22
22	"Mericarps with bristles or spines, sometimes only at apex"	23
22	"Mericarps smooth or ribbed"	26
23	"Mericarps with a few spines at apex"	"Oenanthe {Oenanthe pimpinelloides}"
23	"Mericarps (at least those on outside of umbellules) covered in long bristles or spines"	24
24	"Fruit longer than or about as long as rays; mericarps with bristles no longer than the width of the body of the mericarp itself, never hooked; plants not distinctly carrot-scented when crushed"	Torilis
24	"Fruit always shorter than rays; mericarps with bristles longer than the width of the body of the mericarp, sometimes hooked; plants typically strongly carrot-scented when crushed"	25
25	"Involucral bracts absent; fruit with a short beak; bristles on fruit not exceeding beak and style, shorter than width of fruit"	Anthriscus
25	"Involucral bracts 1–13; fruit without a short beak; bristles on fruit exceeding style, longer than width of fruit"	Daucus
26	"Mature fruit more or less spherical, c. 4–5 mm across"	"Coriandrum {Coriandrum sativum}"
26	"Mature fruit more or less elliptic, oblong, ovate or reniform, or of 2 spherical mericarps, if somewhat spherical then less than 3 mm across"	27
27	"Mericarps fused c. half their length, spherical, rugose but not ribbed"	Bifora
27	"Mericarps fused most of their length, variously shaped, ribbed or tuberculate"	28
28	"Bracts and bracteoles absent or inconspicuous"	29
28	"Bracts and bracteoles present"	33
29	"Ultimate leaflets more than 1 mm wide"	30
29	"Ultimate leaflets up to 1 mm wide"	32
30	"Plant spreading by long slender rhizomes"	Aegopodium
30	"Plants tufted"	31
31	"Plants robust or weak, erect or procumbent; compound umbel sessile or pedunculate; fruit broad-ovoid or obovoid or more or less spherical, 1.5–2.5 mm across"	Apium
31	"Plant robust, erect; compound umbel pedunculate; mericarps dorsally very flattened, 5–7 mm broad"	"Pastinaca {Pastinaca sativa}"
32	"Weak procumbent annual; compound umbel sessile"	"Cyclospermum {Cyclospermum leptophyllum}"
32	"Robust erect perennial; compound umbel pedunculate"	"Foeniculum {Foeniculum vulgare}"
33	"Leaves simple or pinnate"	34
33	"Leaves 2–4-pinnate"	40
34	"Leaves simple or, if some leaves pinnate, then leaflets filiform and terete"	35
34	"Leaves pinnate; leaflets flat, never filiform"	37
35	"Leaves in a basal rosette"	"Oschatzia {Oschatzia cuneifolia}"
35	"Leaves cauline"	36
36	"Bracteoles longer than pedicels"	Bupleurum
36	"Bracteoles much shorter than pedicels"	Platysace
37	"Leaf margins serrate or crenate"	38
37	"Leaf margins smooth"	39
38	"Involucral bracts 4–7"	"Berula {Berula erecta}"
38	"Involucral bracts 0–2"	"Helosciadium {Helosciadium nodiflorum}"
39	"Plants glabrous; leaves with 5–13 leaflets; peduncle to 40 cm long"	"Gingidia {Gingidia harveyana}"
39	"Plant usually hirsute; leaves simple or ternate; peduncle less than 2 cm long"	Xanthosia
40	"Umbel with 1–4 rays; leaves mostly basal (mostly alpine herbs)"	Oreomyrrhis
40	"Umbel with 4–20 or more rays; leaves cauline (weeds)"	41
41	"Plant glaucous; fruit 6.5–8 mm long"	Capnophyllum
41	"Plant green; fruit 1.5–4 mm long"	42
42	"Compound umbel with more than 20 rays; rays 2–7 cm long"	"Ammi {Ammi majus}"
42	"Compound umbel with up to 20 rays; rays 1–3.5 cm long"	43
43	"Stems often purple spotted; petals white or pink"	"Conium {Conium maculatum}"
43	"Stems not purple spotted; petals yellow to green"	"Petroselinum {Petroselinum crispum}"