1	"Leaves 2 or more × compound or divided"	2
1	"Leaves once compound or divided"	17
2	"Ovary inferior"	3
2	"Ovary superior"	4
3	"Fruit dry, splitting into 2 mericarps; inflorescence generally a compound umbel (occasionally simple umbel, head)"	Apiaceae
3	"Fruit a berry; inflorescence a simple or branched cluster of umbels"	Araliaceae
4	"Shrub or tree"	5
4	"Herb or subshrub"	7
5	"Main axis of leaf bearing many small leaflets or lobes in addition to main leaflets"	Rosaceae
5	"Main axis of leaf without small leaflets or lobes in addition to main leaflets"	6
6	"Leaflets entire; flowers cream to yellow, orange, red, or pink"	Fabaceae
6	"Leaflets serrate; flowers white to dark purple"	"Meliaceae {Melia azedarach}"
7	"Ovary very deeply 4--6-lobed; style arising from a deep indentation in middle of ovary"	8
7	"Ovary unlobed or only shallowly lobed; style or sessile stigma(s) terminal or from shallow depression at tip of ovary"	9
8	"Flowers white or pink; herbage not scented"	"Limnanthaceae {Limnanthes}"
8	"Flowers yellow; herbage strongly scented"	"Rutaceae {Ruta}"
9	"Stamens 12--50"	10
9	"Stamens 2--10"	12
10	"Leaves, at least proximal, 2--3-ternately compound, leaflets flat, toothed to irregularly cut"	"Ranunculaceae {Actaea}"
10	"Leaves divided into linear, +- fleshy or flat lobes"	11
11	"Flowers radial; leaves deeply, irregularly 2-ternately or ternately-pinnately lobed, +- fleshy; ovary (2)3(4)-chambered; fruit a capsule"	"Nitrariaceae {Peganum harmala}"
11	"Flowers bilateral; leaves deeply palmately or palmate-pinnately lobed or dissected, not fleshy; ovary 1-chambered; fruit a follicle"	"Ranunculaceae {Consolida}"
12	"Petals 5"	13
12	"Petals 4 or 6"	15
13	"Flowers solitary on peduncles >= 2 cm"	"Violaceae {Viola}"
13	"Flowers several to many in umbels or racemes"	14
14	"Petals yellow to orange or +- red; leaflets entire; inflorescence a raceme"	"Fabaceae {Hoffmannseggia}"
14	"Petals pink to purple; leaflets toothed; inflorescence an umbel"	"Geraniaceae {Erodium}"
15	"Petals 6; leaves all basal"	"Berberidaceae {Vancouveria}"
15	"Petals 4; leaves basal and cauline"	16
16	"Petals all equal; flowers radial; inflorescence a bractless raceme"	Brassicaceae
16	"Petals unequal; flowers bilateral or biradial; inflorescence a bracted raceme or panicle-like cluster"	Papaveraceae
17	"Petal 1"	"Fabaceae {Amorpha}"
17	"Petals 4--6"	18
18	"Ovary > 1/2 inferior"	19
18	"Ovary superior"	23
19	"Shrub or tree; stamens generally 20; fruit a pome"	"Rosaceae {Sorbus}"
19	"Herb; stamens 5--10; fruit a capsule, splitting into mericarps, or a berry"	20
20	"Inflorescence a raceme or spike (sometimes branched)"	21
20	"Inflorescence a simple or compound umbel, a cluster of simple umbels, or 1--several heads"	22
21	"Plant a freshwater aquatic; leaves all cauline, submersed leaves whorled, pinnately dissected into thread-like segments"	"Haloragaceae {Myriophyllum}"
21	"Plant terrestrial; leaves basal and cauline, alternate, +- palmately compound"	"Saxifragaceae {Lithophragma parviflorum}"
22	"Styles 2; fruit splitting into 2 mericarps; inflorescence generally a compound umbel (simple umbel, 1 or more heads)"	Apiaceae
22	"Styles 5; fruit a berry; inflorescence of 2--many umbels in simple or branched cluster"	Araliaceae
23	"Stamens many, filaments fused in tube around style; styles 5+"	Malvaceae
23	"Stamens generally 4--10, or if many, free; styles generally 1--3"	24
24	"Flowers strongly bilateral, 1 petal markedly different from others"	25
24	"Flowers +- radial or if bilateral, petals 4 in dissimilar pairs"	27
25	"Petals 4; sepals 2"	Papaveraceae
25	"Petals 5; sepals or calyx lobes 5 (occasionally appearing to be 3 or fewer)"	26
26	"Odd petal uppermost in flower; stamens 10(5), generally all filaments or 9 of them fused, forming a tube around ovary (filaments free); carpel 1; fruit a legume or indehiscent pod"	Fabaceae
26	"Odd petal lowermost in flower; stamens 5, free but tightly appressed against ovary; carpels 3; fruit a capsule"	"Violaceae {Viola}"
27	"Leaflets or leaf segments 2 or 3"	28
27	"Leaflets or leaf segments 4 or more"	39
28	"Herb or subshrub"	29
28	"Tree or well-developed shrub"	33
29	"Petals 4; stamens 6"	30
29	"Petals 5; stamens 5 or 10"	31
30	"Ovary sessile on receptacle; flowers of raceme not subtended by bracts"	Brassicaceae
30	"Ovary separated from receptacle by a stalk; flowers of raceme generally subtended by bracts or flowers solitary, axillary"	Cleomaceae
31	"Leaflet margins toothed or lobed"	Saxifragaceae
31	"Leaflet margins entire (sometimes apically notched)"	32
32	"Leaves alternate or all basal; stamens +- fused, at least at base; ovules or seeds many"	"Oxalidaceae {Oxalis}"
32	"Leaves opposite; stamens free; ovules or seeds 1 per chamber"	Zygophyllaceae
33	"Leaves opposite"	34
33	"Leaves alternate"	36
34	"Leaflets 2, fused at base [leaves deeply 2-lobed], entire, resinous"	"Zygophyllaceae {Larrea}"
34	"Leaflets 3, occasionally +- fused, toothed, not resinous"	35
35	"Leaflets coarsely serrate or crenate; stigmas 2, +- sessile; ovary 2-winged; fruit generally splitting at maturity into winged mericarps"	"Sapindaceae {Acer glabrum}"
35	"Leaflets finely serrate; stigmas and styles 3; ovary wingless; fruit a bladdery, 3-chambered capsule"	"Staphyleaceae {Staphylea bolanderi}"
36	"Leaflets gland-dotted; fruit a round, winged achene"	"Rutaceae {Ptelea}"
36	"Leaflets not gland-dotted; fruit a capsule or berry"	37
37	"Petals 4; ovary separated from receptacle by a stalk"	"Cleomaceae {Peritoma arborea}"
37	"Petals 5--6; ovary sessile on receptacle"	38
38	"Petals 5; leaflets entire to lobed, but not spiny-toothed"	Anacardiaceae
38	"Petals 6; leaflets spiny-toothed"	"Berberidaceae {Berberis}"
39	"Leaves palmately compound or divided"	40
39	"Leaves pinnately compound or divided"	43
40	"Plant woody"	41
40	"Plant herbaceous"	42
41	"Leaves opposite; erect shrub or tree"	"Sapindaceae {Aesculus}"
41	"Leaves alternate; woody vine with tendrils"	"Vitaceae {Parthenocissus}"
42	"Leaflets entire; inflorescence a raceme; ovary separated from receptacle by a stalk"	"Cleomaceae {Peritoma}"
42	"Leaflets or leaf segments toothed; inflorescence (1)2-flowered; ovary sessile on receptacle"	"Geraniaceae {Geranium}"
43	"Petals 4"	44
43	"Petals 5 or more"	45
44	"Ovary entire or +- 2-lobed; inflorescence a generally bractless raceme"	Brassicaceae
44	"Ovary very deeply 4-lobed; flowers solitary and axillary or inflorescence a leafy-bracted raceme"	"Limnanthaceae {Limnanthes}"
45	"Shrub or tree (occasionally low-creeping)"	46
45	"Herb or subshrub"	50
46	"Petals 6; leaflets spiny-toothed; stems and leaves non-scented"	"Berberidaceae {Berberis}"
46	"Petals 5(6); leaflets entire or toothed but not spiny; stems and leaves often strongly scented"	47
47	"Ovary divided into 2--5 flattened lobes; fruit a cluster of elongated, winged achenes; leaflets with gland-tipped teeth near base"	"Simaroubaceae {Ailanthus}"
47	"Ovary entire; fruit a drupe or legume; leaflets without gland-tipped teeth"	48
48	"Flowers solitary or few; leaflets 2--10 mm, +- entire --- small tree of DSon"	"Burseraceae {Bursera microphylla}"
48	"Flowers in racemes or panicles, often many; leaflets mostly > 7 mm, often much longer, toothed or entire"	49
49	"Corolla << 1 cm diam, white to +- green or pale yellow; fruit a drupe; leaflets often toothed"	Anacardiaceae
49	"Corolla > 1 cm diam, bright yellow; fruit a legume; leaflets entire"	"Fabaceae {Senna}"
50	"Leaves +- cylindric [leaflets and lobes generally closely overlapping around axis], generally basal; fruit an achene; hypanthium present"	"Rosaceae {Ivesia}"
50	"Leaves +- flat, basal and/or cauline; fruit nutlets, mericarps, a capsule, or a legume; hypanthium 0"	51
51	"Anther-bearing stamens as many as petals --- fruit with long beak, splitting into 5 mericarps"	"Geraniaceae {Erodium}"
51	"Anther-bearing stamens 2 &times; as many as petals (occasionally some anthers much smaller than others)"	52
52	"Flowers in racemes or panicles; ovary chamber 1; fruit dehiscent"	53
52	"Flowers solitary, in pairs, or in a leafy-bracted raceme; ovary chambers generally 5; fruit splitting into mericarps"	54
53	"Terminal leaflet 0; fruit a legume"	"Fabaceae {Senna}"
53	"Terminal leaflet present; fruit a capsule"	Resedaceae
54	"Stipules 0; ovary very deeply 5-lobed; style base surrounded by ovary lobes"	"Limnanthaceae {Limnanthes}"
54	"Stipules present; ovary entire or shallowly lobed at time of pollination; style at tip of ovary"	Zygophyllaceae