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5 In cladistics, a synapomorphy or synapomorphic character state is a trait that is shared ("symmorphy") by two or more taxa and inferred to have been present in their most recent common ancestor, whose own ancestor in turn is inferred to not possess the trait. A synapomorphy is thus an apomorphy (derived trait) visible in multiple taxa, where the trait in question is assumed to have originated in their last common ancestor. "True" synapomorphies uniquely characterise a given set of terminal groups, but it is not strictly necessary that all members of a clade possess the same trait (they may exhibit instead a further-modified version of the trait).
6 The rosid clade as defined by molecular data is broader than the traditional subclass Rosidae (Cronquist, 1981; Takhtajan, 1980, 1997) and encompasses many families formerly classified in the polyphyletic subclasses Magnoliidae, Dilleniidae, and Hamamelidae. The rosids comprise 140 families and close to one-third of all angiosperm species (D. Soltis et al., 2005). Clear synapomorphies for the rosids have not been identified, although most rosids share several morphological and anatomical features, such as nuclear endosperm development, reticulate pollen exine, generally simple perforations of vessel end-walls, alternate intervessel pitting, mucilaginous leaf epidermis, and two or more whorls of stamens, plus ellagic acid (Hufford, 1992; Nandi et al., 1998; reviewed in D. Soltis et al., 2005).
7 Succulent herbs to shrubs with Crassulacean Acid Metabolism (CAM) Leaves succulent
8 Succulent herbs to shrubs with Crassulacean Acid Metabolism (CAM) Leaves succulent
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11 4 to 5 petals, distinct to connate 4 to 5 sepals, distinct to connate 4 to 10 stamens (same # or 2 x petals) 4 to 5 (to 6) simple pistils, apocarpous
12 4 to 5 petals, distinct to connate 4 to 5 sepals, distinct to connate 4 to 10 stamens (same # or 2 x petals) 4 to 5 (rarely 6) simple pistils, apocarpous
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26 Herbaceous to woody No hypanthium 4 sepals, 4 petals 6 (to many) stamens, often 4 long filaments, 2 short Syncarpous, 2 carpels, ovary superior
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28 4 sepals, 4 petals 6 stamens, often 4 long filaments, 2 short Syncarpous, 2 carpels, ovary superior
29 Syncarpous, 2 carpels, ovary superior
30 Hypanthium 4 separate sepals, 4 petals 8 stamens Syncarpous, 4 carpels ovary inferior
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40 Herbaceous or woody Betacyanins Small flowers in clusters, often surrounded by involucre of bracts Perianth (sepals/petals) with either 5 or 6 parts (6 in Eriogonum) Stamens in multiples of 3s Syncarpous, 3 fused carpels; oneseeded triangular fruit
41 Perianth with either 5 or 6 tepals (6 in Eriogonum) Stamens in multiples of 3s or 5 to 9 Syncarpous, 3 (rarely 2) fused carpels; one-seeded triangular fruit
42 Perianth with either 5 or 6 parts (6 in Eriogonum) Stamens often in multiples of 3s Syncarpous, 3 fused carpels; oneseeded triangular fruit
43 Flowers in clusters, surrounded by an involucre of bracts
44 Perianth with either 5 or 6 tepals (5 in Polygonum, Persicaria, Rumex). If 5 tepals, then 2 ith both margins on outside in bud, 2 with both margins inside, 1 half in half out) Stamens 5-9 Syncarpous, 3 fused carpels; oneseeded triangular fruit
45 Nodes often swollen Sheathing stipules (ocreae) surrounding stems (lacking in Eriogonum) Fruits triangular
46 Hypanthium 4-5 sepals, petals Stamens opposite petals
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48 Always woody Hypanthium 4-5 sepals, petals Stamens opposite petals Syncarpous
49 Hypanthium 4-5 sepals, petals Stamens opposite petals
50 Syncarpous, 2-3 carpels
51 Always woody Simple leaves Monoecious Male flowers in unisexual catkins, 4-6 sepals Female flowers solitary to clusters of 2-3, with inferior ovary, 3 fused carpels, surrounded by cupshaped involucre of bracts no perianth
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53 Male flowers in unisexual catkins, 4-6 sepals
54 Female flowers solitary to clusters of 2-3, with inferior ovary, 3 fused carpels, surrounded by cupshaped involucre of bracts no perianth
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56 Herbaceous or woody Betacyanins Small flowers in clusters, often surrounded by involucre of bracts Perianth (sepals/petals) with either 5 or 6 parts (6 in Eriogonum) Stamens in multiples of 3s Syncarpous, 3 fused carpels; oneseeded triangular fruit
57 Like rosids, asterids are a large clade, encompassing nearly onethird of all angiosperm species (80,000 species) classified in 114 families (Albach et al., 2001a; D. Soltis et al., 2005). However, unlike the rosids, a group of families corresponding closely to the asterid clade has been recognized on morphological grounds for over 200 years (de Jussieu, 1789; Reichenbach, 1828; Warming, 1879), and several morphological and chemical features appear to unite all or most asterids. Most notable are iridoid chemical compounds (e.g., Jensen, 1992), corollas with fused petals, unitegmic and tenuinucellate ovules, and cellular endosperm development; however, it is still unclear which of these features are actually synapomorphies for asterids (cf. Albach et al., 2001b; Judd et al., 2002). The asterid clade is broader than the Asteridae of recent classifications (e.g., Cronquist, 1981; Takhtajan, 1980, 1997) and includes also members of the polyphyletic subclasses Hamamelidae, Dilleniidae, and Rosidae (Olmstead et al., 1992, 1993, 2000; Chase et al., 1993; D. Soltis et al., 1997, 2000; P. Soltis et al., 1999; Savolainen et al., 2000a, b).
58 Perianth with either 5 or 6 parts (6 in Eriogonum) Stamens in multiples of 3s Syncarpous, 3 fused carpels; oneseeded triangular fruit
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60 Perianth with either 5 or 6 parts (6 in Eriogonum) Stamens in multiples of 3s Syncarpous, 3 fused carpels; oneseeded triangular fruit
61 Flowers in clusters, surrounded by an involucre of bracts
62 Fruits triangular
63 Often woody; leaves usually alternate; connate sepals and connate petals (usually 5 in CA, 4 in South Africa), 2x stamens, anthers opening by terminal pores syncarpous)
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65 Usually woody
66 5 connate sepals 5 connate petals
67 Usually twice the number of stamens as petals Stamens opening by terminal pores
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69 Often herbaceous Scorpioid inflorescence 5 connate sepals, 5 connate petals, 5 epipetalous stamens Syncarpous, 2 fused carpels
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71 Often herbaceous Scorpioid inflorescence
72 Often herbaceous 5 connate sepals 5 connate petals 5 epipetalous stamens
73 Often herbaceous Syncarpous, 2 fused carpels Either 2 styles (split style) Or 4 nutlets
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