Survey of sections & series (van Gelderen 1994) Van Gelderen 1994 : 99-103 sectio 8. Acer series 11. Acer sectio 1. Parviflora series 12. Monspessulana series 1. Parviflora series 13. Saccharodendron series 2. Distyla series 3. Caudata sectio 9. Pentaphylla sectio 2. Palmata series 14. Pentaphylla series 4. Palmata series 15. Trifida series 5. Sinensia sectio 10. Trifoliata series 6. Penninervia series 16. Grisea sectio 3. Wardiana series 17. Mandshurica sectio 4. Macrantha sectio 11. Lithocarpa sectio 5. Glabra series 18. Lithocarpa series 7. Glabra series 19. Macrophylla series 8. Arguta sectio 12. Platanoidea sectio 6. Negundo sectio 13. Pubescentia series 9. Negundo sectio 14. Ginnala series 10. Cissifolia sectio 15. Rubra sectio 7. Indivisa sectio 16. Hyptiocarpa Acer sectio Macrantha type species : Acer pensylvanicum (lectotype ?) - snake-bark maples - inflorescence raceme (+ terminal flower !) - winter buds with 2 pairs of valvate scales - lateral buds pedicellate A. pensylvanicum A. capillipes A. capillipes, pistillate flower A. capillipes A. davidii A. micranthum A. micranthum Acer pectinatum (Pax 1902) A. pectinatum A. rufinerve A. rufinerve A. rufinerve A. tegmentosum Acer sectio Palmata series Palmata type species : Acer palmatum series Sinensia type species : Acer sinense series Penninervia type species : Acer laevigatum - winter buds valvate - terminal bud reduced Acer palmatum (series Palmata) Acer palmatum Acer palmatum Acer palmatum Acer palmatum Acer circinatum Acer circinatum Acer circinatum Acer shirasawanum Acer shirasawanum Acer sinense (series Sinensia) Acer elegantulum Acer laevigatum (series Penninervia) Acer cordatum (Pax 1902) Acer cordatum Acer fabri Acer : summary Acer - Sapindaceae - Sapindales - rosids - euDC Leaves : imparipinnate - palmate - palmately lobed - unlobed Flower : S 5 P5 disc A 8 G (2) always unisexual Fruit : double samara, often with parthenocarpy Inflorescence : from duodichogamy to dioecy Winter bud : scales = leaf petiole, from 2 - many pairs IG classification : some sections easy to recognize some sections heterogenous phylogeny within genus still not resolved Farewell to Acer Thanks to : - Belgische Dendrologie Belge - Arboretum Wespelaar - Jan De Langhe - to whom I forget (sorry for that) Erat studium acerissimum ... Acer Cladistics : polyphyletic, monophyletic and paraphyletic taxa .