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Lab 1 Type B
give common name from characteristics
10
Science
Undergraduate 1
08/21/2010

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Cards

Term
Leaves: opposite, pinnately compound, 3-5 leaflets
Twigs: shiny with waxy bloom that rubs off, have crescent-shaped leaf scars that meet on twig
Buds: have a white pubescence
Fruit: paired samara with slightly convergent wings
Definition

boxelder

Term

Habit: looks like sugar maple

Leaves: opposite, simple, 5-7 lobed,

petioles leak milky sap when cut

Buds: scales 2-3 pairs (compare to sugar maple), hidden by petiole, milky sap

Fruit: Paired samara, wings divergent by almost 180 degrees

Definition

Norway maple

Term

Leaves: opposite, simple, 3-5 lobed, lobes doubly serrate or toothed

Fruit: paired samara, small, wings slightly divergent by 90 degrees

Buds: terminal bud dark red, blunt

Twigs: bright red & lustrous

Definition
red maple
Term

Leaves: opposite, simple; 3-5 lobed

(not as sharp pointed as Norway maple)

Buds: terminal buds have many scales, lateral buds are sharp

Bark: has long irregular blocky plates

Fruit: paired samara with wings slightly parallel or divergent by 90 degrees

Definition
sugar maple
Term

Leaves: alternate, simple, solitary on long shoot, in 3s on short spur shoots, coarsely doubly serrate

Buds: often gummy

Bark: creamy white on older trees, peels off in papery strips

Fruit: singe winged samara, elliptical to oval, borne on drooping catkins in the fall

Definition
paper birch
Term

Habit: shrub

Leaves: alternate, simple, irregularly serrate, sometimes doubly serrate

Twigs: persistent catkins typically present

Buds: two-toned

Fruit: edible nut enclosed in bristly husk with a long open "beak"

Definition
beaked hazel
Term

Leaves: opposite, pinnately compound, 7-9 short-stalked leaflets, entire or somewhat serrate

Twigs: have a knobby appearance

Buds: uppermost pair of lateral buds are adjacent to terminal bud

Fruit: single samara, persistent through winter 

Habitat: upland sites

Definition
white ash
Term

Leaves: simple, sharply doubly serrate, thin and very tough, petioles pubescent

Bark: loose longitudinal strips give shredded (cat scratch) appearance

Fruit: small nut enclosed in flattened sacs in clusters (looks like 'hops' for beer-making)

Definition
hophornbeam (ironwood)
Term

Leaves: orbicular, finely serrate, petioles laterally compressed

Bark: creamy white to yellowish-green and smooth, becoming gray and fissured

Fruit: capsule, oblong-cylindrical, 2-valved, present May-June

 

Definition
quaking aspen
Term

Leaves: opposite, pinnately compound, 5-7 leaflets, base asymmetrical

Twigs: large spongy pith, purple to yellow-brown, lenticels conspicuous

Buds: very large, purple

Bark: has conspicuous raised lenticels

Fruit: small bright red drupe in upright clusters

Definition
red elderberry
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