taxonID	type	description	language	source
7A3E1E90B72652FE9FFAD044942775E4.taxon	description	Description. Trees, deciduous or evergreen, with labile sex expression ranging from monoecy to dioecy (possibly exclusively dioecious in A. pycnanthum). Wood distinctly ring-porous, rays 1 - 4 (10) cells wide. Bud scales imbricate, decussate, in pairs of 4 - 11. Leaves entire, unlobed, or 3 - or 5 - lobed, elliptic to ovate, toothed or entire, glaucous to blue-colored beneath; cuticular waxes of leaves comprising a smooth layer on the adaxial surface and bearing membranous platelets and wax splatter features abaxially; primary veins 1 or 3, 5 in 5 - lobed individuals of A. saccharinum; petioles sometimes turning red (e. g., new growth, late season). Inflorescences axillary (rarely terminal) from leafless buds, usually emerging before leaves, paniculate thyrses, racemes, or umbels. Sepals 5. Petals 0 or 5, red, red-green, or green when present. Stamens 5 - 12, inserted on (A. laurinum and A. pinnatinervium) or outside of staminal disk, disk sometimes reduced or absent (A. rubrum, A. saccharinum, A. pycnanthum). Carpels 2. Fruits schizocarps with partially inflated seed locules, sometimes turning red during maturation, partitioning wall generally narrower than the seed locules; mericarps diverging from each other at less than 90 °, wings straight to slightly convex on the proximal (vein-dense) side, curved on the distal side. Some fruits seedless and partially developed at maturity. Five species showing a disjunct distribution between eastern and southeastern Asia (3 spp.) and eastern North America (2 spp.), a common biogeographic pattern among Northern Hemisphere plant groups (Donoghue and Smith 2004; Harris et al. 2013, 2017; Li 1952; Wen 1999, 2001; Xiang et al. 2015). Acer laurinum Hasskarl, Tijdschr. Natuurl. Gesch. Physiol. 10: 138. 1843. Acer javanicum Junghuhn, 1841 Acer niveum Blume, 1847 Acer cassiifolium Blume, 1847 (as cassiaefolium) Acer philippinum Merrill, 1906 Acer garrettii Craib, 1920 Acer decandrum Merrill, 1932 Acer chionophyllum Merrill, 1941 Acer longicarpum Hu & W. C. Cheng, 1948 Acer macropterum T. Z. Hsu & H. Sun, 1997 Acer pinnatinervium Merrill, Brittonia 4: 109. 1941. Acer machilifolium Hu & Cheng, 1948 Acer jingdongense T. Z. Hsu, 1983 Acer pycnanthum K. Koch, Ann. Mus. Bot. Lugduno-Batavi 1: 250. 1864. Acer rubrum Linnaeus, Sp. Pl. 1055. 1753. Acer carolinianum Walter, 1788 Acer barbatum Michaux, 1803, pro parte Acer sanguineum Spach, 1834 Saccharodendron barbatum (Michaux) Nieuwland, 1914, pro parte Rufacer carolinianum (Walter) Small, 1933 Rufacer rubrum (Linneaus) Small, 1933 Acer saccharinum Linnaeus, Sp. Pl. 1055. 1753. Acer sylvestre Young, 1783 Acer glaucum Marshall, 1785 Acer rubrum Linneaus var. pallidum Aiton Acer dasycarpum Ehrhart, 1789 Acer eriocarpum Michaux, 1803 Acer tomentosum Steudel, 1821 Acer coccineum F. Michaux Saccharosphendamnus saccharina (Linnaeus) Nieuwland, 1914 Argentacer saccharinum (Linnaeus) Small, 1933	en	Harris, AJ, Chen, Yousheng, Olsen, Richard T., Lutz, Sue, Wen, Jun (2017): On merging Acer sections Rubra and Hyptiocarpa: Molecular and morphological evidence. PhytoKeys 86: 9-42, DOI: http://dx.doi.org/10.3897/phytokeys.86.13532, URL: http://dx.doi.org/10.3897/phytokeys.86.13532
