Acer saccharinum L. var. laciniatum Pax
Acer saccharinum L. var. wieri Rehder
Argentacer saccharinum (L.) Small
Acer saccharinum L.
Silver maple, creek maple, river maple, silverleaf maple, soft maple, white maple, water maple
Silver maple is a native of eastern North America.
Plants: Up to 49–82′ (15–25 m) in height, with a maximum of 115′ (35 m). Bark is gray, smooth on younger trees, shaggy on older trees.
Leaves: Similar to those of the closely related red maple, but they are divided into narrower lobes, more deeply notched, and are silvery-white on the undersides. They are about 3–6 ⨉ 2–4½″ (8–16 ⨉ 6–12 cm). In the fall, leaves remain green or turn greenish yellow, sometimes with reddish tints.
Flowers: Several small greenish-yellow flower clusters occur near the ends of twigs, spaced 1–3″ (2.5–7.6 cm) apart.
Fruits: As with other maples, fruits are winged pairs opposite each other. These pairs are the largest of any maple, about 1¼″ (3.2 cm), forming an angle between about 45-90°.
Habitats: Often found near water, especially along riverbanks.
Online References:
References:
7/23/2010 · Nashua River Boat Ramp on Rte 119, Groton, Massachusetts · ≈ 9 × 6″ (22 × 14 cm) 
Female flowers. · 3/14/2012 · Susan and Raimond’s, Phoenix, Maryland · ≈ 2 × 2½″ (5.9 × 6.2 cm)
ID is uncertain 
9/19/2010 · Nashua River Rail Trail, Hollis, New Hampshire · ≈ 11 × 7″ (27 × 18 cm) 
7/23/2010 · Nashua River Boat Ramp on Rte 119, Groton, Massachusetts · ≈ 15 × 10″ (39 × 26 cm) 
7/23/2010 · Nashua River Boat Ramp on Rte 119, Groton, Massachusetts · ≈ 14 × 9″ (35 × 23 cm) 
7/23/2010 · Nashua River Boat Ramp on Rte 119, Groton, Massachusetts · ≈ 2 × 1′ (62 × 41 cm) 
Female flowers. · 3/14/2012 · Susan and Raimond’s, Phoenix, Maryland · ≈ 2½ × 2½″ (7.3 × 6.7 cm)
ID is uncertain 
7/23/2010 · Nashua River Boat Ramp on Rte 119, Groton, Massachusetts · ≈ 8 × 5″ (19 × 13 cm) 
Female flowers. · 3/14/2012 · Susan and Raimond’s, Phoenix, Maryland · ≈ 4½ × 3″ (11 × 7.9 cm)
ID is uncertain 
6/4/2010 · Nashua River Rail Trail, Ayer, Massachusetts · ≈ 15 × 10″ (39 × 26 cm) 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Magnoliopsida | Dicotyledons—plants with two initial seed leaves |
| Subclass | Rosidae | Roses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more |
| Order | Sapindales | Includes citrus; maples, horse-chestnuts, lychees and rambutans; mangos and cashews; frankincense and myrrh; mahogany and neem |
| Family | Sapindaceae | Soapberry family |
| Genus | Acer | Maples |
| Species | saccharinum | I think this means “kind of sweet”—about half as sweet as sugar maple |
Acer saccharinum description by Thomas H. Kent, not updated.
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