ClipArt ETC
Bark falling away in reddish, papery layers.

Betula

Bark falling away in reddish, papery layers.

Low, brittle shrub with wood lighter than cork; green parts with a milky sap.

Stillingia

Low, brittle shrub with wood lighter than cork; green parts with a milky sap.

Leaves leathery; evergreen; flowers showy, white, large.

Gordonia

Leaves leathery; evergreen; flowers showy, white, large.

Leaves over four times as long as broad.

Salix

Leaves over four times as long as broad.

Buds covered with overlapping scales; fruit warty.

Planera

Buds covered with overlapping scales; fruit warty.

Buds with a single scale; fruit cone-like.

Alnus

Buds with a single scale; fruit cone-like.

Leucothoe

Leucothoe

Leucothoe

Sepals not pubescent or only slightly so; fruit a linear, two grooved capsule; leaves elliptic.

Itea

Sepals not pubescent or only slightly so; fruit a linear, two grooved capsule; leaves elliptic.

Sepals copiously pubescent; fruit a subglobose, valved capsule, leaves cuneate.

Clethra

Sepals copiously pubescent; fruit a subglobose, valved capsule, leaves cuneate.

A compund leaf.

Ampelopsis

A compund leaf.

Leaves with several veins running from base to apex; stems often thorny.

Smilax

Leaves with several veins running from base to apex; stems often thorny.

Leaves leathery, toothed only near the apex.

Ampelothamnus

Leaves leathery, toothed only near the apex.

Leaves not leathery, entire or with wavy edges.

Berchemia

Leaves not leathery, entire or with wavy edges.

Leaves alternate, not prominently toothed, subcordate at the base.

Breweria

Leaves alternate, not prominently toothed, subcordate at the base.

Leaves opposite, with wavy margins or angularly toothed.

Mikania

Leaves opposite, with wavy margins or angularly toothed.

Divisions of plant body fine and many; plant body usualy floating below the surface.

Riccia

Divisions of plant body fine and many; plant body usualy floating below the surface.

Divisions of plant body coarse, two lobed; floating on surface.

Ricciocarpus

Divisions of plant body coarse, two lobed; floating on surface.

Plants floating just below water surfacel plant body made up of a clump of short filaments.

Wolffiella

Plants floating just below water surfacel plant body made up of a clump of short filaments.

Plant body of small overlapping scales.

Azolla

Plant body of small overlapping scales.

Plants simple, extremely minute, appearing as grains on surface of water.

Wolffia

Plants simple, extremely minute, appearing as grains on surface of water.

Plant body inconspicuously nerved, roolets one per disk.

Lemna

Plant body inconspicuously nerved, roolets one per disk.

Plant body conspicuously nerved, roolets two to several per disk.

Spirodela

Plant body conspicuously nerved, roolets two to several per disk.

Leaves large and dilated with inflated petioles.

Eichhornia

Leaves large and dilated with inflated petioles.

Leaves wide to the base, without petioles.

Pistia

Leaves wide to the base, without petioles.

Leaves mostly differentiated into blades and petioles.

Limnobium

Leaves mostly differentiated into blades and petioles.

Leaves dissected and bearing bladders.

Utricularia

Leaves dissected and bearing bladders.

Branches of stem bearing small bladders; slowers showy, purple.

Utricularia

Branches of stem bearing small bladders; slowers showy, purple.

Plant body made p of smooth, proliferating stems.

Eleocharis

Plant body made p of smooth, proliferating stems.

Plant body made up of stems bearing whorled, brittle branches.

Chara

Plant body made up of stems bearing whorled, brittle branches.

Submerged leaves bearing bladders; flowers irregular, showy ellow or purple.

Utricularia

Submerged leaves bearing bladders; flowers irregular, showy ellow or purple.

Submerged leaves gathered along a few centimeters of the stem; flower stalks inflated.

Hottonia

Submerged leaves gathered along a few centimeters of the stem; flower stalks inflated.

Submerged leaves whorled, stems usually very lax.

Myriophyllum

Submerged leaves whorled, stems usually very lax.

Submerged leaves with simple divisions.

Proserpinaca

Submerged leaves with simple divisions.

Submerged leaves alternate or irregularly borne.

Ranuneulus

Submerged leaves alternate or irregularly borne.

Submerged leaves opposite; leaflets not toothed.

Cabomba

Submerged leaves opposite; leaflets not toothed.

Submerged leaves whorled; leaflets minutely toothed on one edge.

Ceratophyllum

Submerged leaves whorled; leaflets minutely toothed on one edge.

Leaves without midribs evident when examined against transmitted light; flowers yellow.

Heteranthera

Leaves without midribs evident when examined against transmitted light; flowers yellow.

Leaves with midribs evident when examined against light; flowers inconspicuous, not yellow.

Potamogeton

Leaves with midribs evident when examined against light; flowers inconspicuous, not yellow.

Leaf, when examined with hand lends, showing a central dense and a peripheral less dense zone.

Vallisneria

Leaf, when examined with hand lends, showing a central dense and a peripheral less dense zone.

Leaf, when examined with hand lends, not showing zones.

Alismaceae

Leaf, when examined with hand lends, not showing zones.

Leaves all from a hardened base or from a single point; base of leaves with spore sacs.

Isoetes

Leaves all from a hardened base or from a single point; base of leaves with spore sacs.

"The common wormwood; a European species, much cultivated for its bitter qualities; it contains a volatile oil which is the principle ingredient in the French liquor absinthe."-Whitney, 1902

Absinthium

"The common wormwood; a European species, much cultivated for its bitter qualities; it contains a volatile…

"An Egyptian tree; the bark and pods are frequently used in tanning and the aqueous extract of the wood some Indian species forms the catechu of commerce."-Whitney, 1902

Acacia

"An Egyptian tree; the bark and pods are frequently used in tanning and the aqueous extract of the wood…

Upper leaves shorter and broader.

Callitriche

Upper leaves shorter and broader.

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves, and they are sometimes cultivated for the sake of their beautiful foliage."-Whitney, 1902

Acanthus

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves,…

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves, and they are sometimes cultivated for the sake of their beautiful foliage."-Whitney, 1902

Acanthus

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves,…

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves, and they are sometimes cultivated for the sake of their beautiful foliage."-Whitney, 1902

Acanthus

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves,…

Plants stuff; rooting along the stem; leaves stiff and often fascicles.

Juncus

Plants stuff; rooting along the stem; leaves stiff and often fascicles.

Leaves with dilated bases.

Najas

Leaves with dilated bases.

Leaves with narrow bases.

Zannichellia

Leaves with narrow bases.

Selerolepis

Selerolepis

Selerolepis

Leaves usually three in whorls (sometimes four); flowers minute and inconspicuous

Anacharis

Leaves usually three in whorls (sometimes four); flowers minute and inconspicuous

Leaves crowded on stem; flowers three petaled, pink and fairly conspicuous.

Mayaca

Leaves crowded on stem; flowers three petaled, pink and fairly conspicuous.

Leaf-base apparently inflated.

Ruppia

Leaf-base apparently inflated.

Leaf-base narrow, sometimes with stipules.

Potamogeton

Leaf-base narrow, sometimes with stipules.

Leaves elliptic, the petiole ad under surface coated with a thick jelly-like material.

Brasenia

Leaves elliptic, the petiole ad under surface coated with a thick jelly-like material.

Leaves small, about 8 cm. in diameter or less; toothed or lobed.

Hydrocotyle

Leaves small, about 8 cm. in diameter or less; toothed or lobed.

Leaves small, mostly less than 15cm. long, heart-shaped; flowers white and less than 2.5cm across.

Nymphoides

Leaves small, mostly less than 15cm. long, heart-shaped; flowers white and less than 2.5cm across.

Flowers white; leaf-blade round.

Nymphaea

Flowers white; leaf-blade round.

Leaves round, often peltate; the long petiole attached near center of leaf.

Hydrocotyle

Leaves round, often peltate; the long petiole attached near center of leaf.