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Table 1 Leaf characters by tribe in Asteraceae of the xeric scrub at the REPSA, Mexico

From: Meso- or xeromorphic? Foliar characters of Asteraceae in a xeric scrub of Mexico

Tribe Anthemidae Astereae Bahieae Carduae Cichorieae Coreopsidae Eupatorieae Gnaphalieae Heliantheae Millerieae Nassauvieae Senecioneae Tageteae
No. species/character 2 5 2 1 3 5 12 2 10 2 1 3 4
Leaf size classification Micro* Noto (3), micro (2) Micro Macro Macro (2), meso Meso (2), micro (2), noto (1) Noto (5), meso (4), micro (2), macro (1) Micro Meso (4), noto (2), mega (2), macro (1), micro (1) Meso, noto Meso Macro (2), meso micro (2), meso (1), nano (1)
Lobation Lobed Unlobed (4), lobed Lobed Lobed Lobed (2), unlobed Lobed Unlobed Unlobed Unlobed (7), lobed Unlobed Unlobed Unlobed (2), lobed Unlobed (2), lobed
Margin type Untoothed Untoothed (3), toothed Untoothed Tooted Toothed (2), untoothed toothed (3), untoothed Toothed (11spp), untoothed Untoothed Toothed (8) or untoothed Toothed Toothed Toothed (2spp) or untoothed Toothed (2spp) or untoothed
Tooth type NA Serrated (2 spp) NA Serrated Eentate Serrated (3) Serrated (11) NA Serrated (6), crenated (2) Serrated Serrated Serrated (1) or dentate (1) Serrated (2)
Leaf type by the position of stomata Amphi* Amphi Amphi Amphi Amphi (2), hypos Amphi (3), hypos Hypos (8), amphi Amphi (1), hypos Amphi (7), hypos Amphi Amphi Hypos (2), amphi Amphi
  Bifacial or equifacial Bifacial Bifacial or equifacial Bifacial Bifacial Bifacial or equifacial Bifacial Bifacial Bifacial Bifacial Bifacial Bifacial Bifacial or equifacial
Total lamina thickness, mean µm 102.8 217.3 326.7 413.1 182.8 246.4 148.5 126.8 200.5 197.07 231.7 238.2 274.9
Cuticle surface Striated (1), smooth Striated Striated Striated Striated (2), smooth Striated Striated (11), smooth Smooth Striated (7), smooth Smooth Striated Striated Striated (3), smooth
Cuticle thickness, range µm 0.31–0.43 0.27–0.56 0.32–0.37 0.32 0.30–0.45 0.22–0.41 0.20–0.60 0.33–0.42 0.21–1.15 0.23–0.24 <0.1 0.36–0.46 0.19–0.44
Epidermal cell walls (surface view) Straight to wavy Straight to wavy Wavy Straight Straight to wavy Straight to wavy Wavy Wavy Straight to wavy Wavy Wavy Straight to wavy Straight to wavy
Position of stomata regarding ordinary epidermal cells Same level Same level Same level Same level Same level Same level Same level (10), higher Same level Same level (10), higher Same level Same level Same level Same level
Stomatal density (abaxial epidermis, mean stomata/mm2) 244 369 366 349 322 383 421 349 394 279 174 256 349
Guard cell length, mean µm 21.36 21.04 23.8 24.38 18.7 21.61 19.64 17.89 20.31 20.18 25.09 23.09 19.39
Palisade parenchyma thickness, mean µm 22.48 69.99 117.65 195.58 46.2 98.03 47.29 44.43 76.27 54.34 52.40 45.47 72.68
Spongy parenchyma thickness, mean µm 53.38 48.20 58.08 165.68 90.94 92.89 71.48 52.97 81.54 113.32 140.46 157.6 93.12
Stomatal pore area index (SPI) % 10.37 15.53 15.70 20.75 15.06 17.27 14.56 11.13 15.09 11.39 10.98 13.57 13.80
  1. In parenthesis number of species for each tribe
  2. * See text for complete names