Survey of sections

1
Survey of sections series (van Gelderen 1994)
Van Gelderen 1994 99-103 sectio 1.
Parviflora series 1. Parviflora series 2.
Distyla series 3. Caudata sectio 2.
Palmata series 4. Palmata series 5.
Sinensia series 6. Penninervia sectio 3.
Wardiana sectio 4. Macrantha sectio 5.
Glabra series 7. Glabra series 8.
Arguta sectio 6. Negundo series 9.
Negundo series 10. Cissifolia sectio 7.
Indivisa
sectio 8. Acer series 11. Acer series 12.
Monspessulana series 13. Saccharodendron sectio
9. Pentaphylla series 14. Pentaphylla series
15. Trifida sectio 10. Trifoliata series 16.
Grisea series 17. Mandshurica sectio 11.
Lithocarpa series 18. Lithocarpa series 19.
Macrophylla sectio 12. Platanoidea sectio 13.
Pubescentia sectio 14. Ginnala sectio 15.
Rubra sectio 16. Hyptiocarpa
2
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
3
A. pensylvanicum

4
A. capillipes
5
A. capillipes, pistillate flower
6
A. capillipes
7
A. davidii
8
A. micranthum
9
A. micranthum
10
Acer pectinatum
(Pax 1902)
11
A. pectinatum
12
A. rufinerve
13
A. rufinerve
14
A. rufinerve
15
A. tegmentosum
16
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
17
Acer palmatum (series Palmata)
18
Acer palmatum
19
Acer palmatum
20
Acer palmatum
21
Acer palmatum
22
Acer circinatum
23
Acer circinatum
24
Acer circinatum
25
Acer shirasawanum
26
Acer shirasawanum
27
Acer sinense (series Sinensia)
28
Acer elegantulum
29
Acer laevigatum (series Penninervia)
30
Acer cordatum
(Pax 1902)
31
Acer cordatum
32
Acer fabri
33
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 phyloge
ny within genus still not resolved
34
Farewell to Acer
The Maple Society www.wbcbotanicalgarden.org/map
lesociety
Thanks to - Belgische Dendrologie Belge -
Arboretum Wespelaar - Jan De Langhe - to whom I
forget (sorry for that)
Erat studium acerissimum ...