ClipArt ETC
Plants aromatic when crushed; flowers blue.

Hydrotrida

Plants aromatic when crushed; flowers blue.

Stem finely pubescent, flowers 3-4 mm long.

Herpestris

Stem finely pubescent, flowers 3-4 mm long.

Stem not finely pubescent; flowers not more than 1.5mm long.

Micranthemum

Stem not finely pubescent; flowers not more than 1.5mm long.

flowers solitary in the axils of the leaves; leaves less than 3.5cm long.

Ludwigia

flowers solitary in the axils of the leaves; leaves less than 3.5cm long.

Flowers in stalked head-like spikes; leaves over 3.5cm long.

Alternanthera

Flowers in stalked head-like spikes; leaves over 3.5cm long.

Stems with a sheath just above attachment point of leaf; flowers individually small, white to pink.

Polygonum

Stems with a sheath just above attachment point of leaf; flowers individually small, white to pink.

Flowers large, showy yellow; fruit a four angled capsule.

Jussiaea

Flowers large, showy yellow; fruit a four angled capsule.

No leaf-sheaths present; flower cluster consisting of one to several showy, irregular, yellow, or purple blossoms.

Utricularia

No leaf-sheaths present; flower cluster consisting of one to several showy, irregular, yellow, or purple…

Leaf-sheaths present only at the base of stem; flowers in one group.

Eleocharis

Leaf-sheaths present only at the base of stem; flowers in one group.

Leaf-sheaths scattered along stem; flowers in several groups.

Fuirena

Leaf-sheaths scattered along stem; flowers in several groups.

Flwers or fruits hidden by overlapping scales.

Scirpus

Flwers or fruits hidden by overlapping scales.

Flowers or fruits individually manifest; parts in threes.

Juncus

Flowers or fruits individually manifest; parts in threes.

Sheaths at base of stem with edges united to form tube.

Eleocharis

Sheaths at base of stem with edges united to form tube.

Sheaths at base of stem merely overlapping.

Juncus

Sheaths at base of stem merely overlapping.

Plants small, mostly under 1 dm tall; leaves filiform, or very narrowly linear.

Myosurus

Plants small, mostly under 1 dm tall; leaves filiform, or very narrowly linear.

Plants aromatic when crushed.

Acorus

Plants aromatic when crushed.

Flowers violet, over 3cm scross; leaves equitant at base; that is coming in two ranks, making the base of the plant appear flattened.

Nemastylis

Flowers violet, over 3cm scross; leaves equitant at base; that is coming in two ranks, making the base…

Flowers inconspicuous and hidden by overlapping scales.

Cyperus

Flowers inconspicuous and hidden by overlapping scales.

Leaves large (1cm wide or wider); flowers very showy.

Iris

Leaves large (1cm wide or wider); flowers very showy.

Leaves smaller, rigid; small yellow flowers gathered in dense heads at top of naked stalk, each subtended by a scale-like bract.

Xyris

Leaves smaller, rigid; small yellow flowers gathered in dense heads at top of naked stalk, each subtended…

Leave from base of scrape bearing button like whitish heads of minute flowers; roots with cross-constrctions.

Eriocaulon

Leave from base of scrape bearing button like whitish heads of minute flowers; roots with cross-constrctions.

Leaves from base of scape bearing evident white flowers in racemes; roots without crss-constrictions.

Sagittaria

Leaves from base of scape bearing evident white flowers in racemes; roots without crss-constrictions.

Flowers with filaments connected by a funnel-like membrane.

Hymenocallis

Flowers with filaments connected by a funnel-like membrane.

Flowers with free filaments.

Crinum

Flowers with free filaments.

Leaf with a ligule at base (junction of leaf and sheath).

Graminae

Leaf with a ligule at base (junction of leaf and sheath).

Leaves narrow, mostly less than 1 cm.

Juncus

Leaves narrow, mostly less than 1 cm.

Sheaths abruptly contracted to blade of leaf; leaves without keels.

Typha

Sheaths abruptly contracted to blade of leaf; leaves without keels.

Sheaths narrowed to blade; leaves with keels.

Sparganium

Sheaths narrowed to blade; leaves with keels.

Flowers few, showy, pinkish purple.

Coreopsis

Flowers few, showy, pinkish purple.

Fruit flattened laterally; fruit not winged.

Ptilimnium

Fruit flattened laterally; fruit not winged.

Fruit flattened dorsally; fruit prominently winged.

Oxypolis

Fruit flattened dorsally; fruit prominently winged.

Root red.

Gyrotheca

Root red.

flowers white in dense button-like heads; leaves bristly-margined.

Eryngium

flowers white in dense button-like heads; leaves bristly-margined.

Flowers yellow, not in button-like heads nor with bristly-margined leaves.

Polygala

Flowers yellow, not in button-like heads nor with bristly-margined leaves.

Spores borne in sacs on lower leaf surface; divisions of the leaf small, less than 2 cm long.

Anchistea

Spores borne in sacs on lower leaf surface; divisions of the leaf small, less than 2 cm long.

Spores borne on terminal modified leaves; divisions of the leaf larger, more than 2 cm long.

Osmunda

Spores borne on terminal modified leaves; divisions of the leaf larger, more than 2 cm long.

Leaves opposite.

Bidens

Leaves opposite.

Leaflets usually three, no more than five.

Ranunculus

Leaflets usually three, no more than five.

Flowers yellow.

Rorippa

Flowers yellow.

Flowers white.

Nasturtium

Flowers white.

Individual leaflets of compud leaves also lobed or divided.

Neobeckia

Individual leaflets of compud leaves also lobed or divided.

Individual leaflets simple.

Proserpinaca

Individual leaflets simple.

Base of petiole not expanded.

Proserpinaca

Base of petiole not expanded.

Leaflets narrowly linear, untoothed; plants annual.

Ptilimnium

Leaflets narrowly linear, untoothed; plants annual.

Leaflets wider, toothed; plants pernnial.

Cicuta

Leaflets wider, toothed; plants pernnial.

Leaves coming off a creeping or horizontal stem.

Hydrocotyle

Leaves coming off a creeping or horizontal stem.

Stems 4-angled; flowers small, in dense clusters in the axils of the leaves.

Lycopus

Stems 4-angled; flowers small, in dense clusters in the axils of the leaves.

Stems round, or nearly so, in cross-section; flowers showy, yellow.

Bidens

Stems round, or nearly so, in cross-section; flowers showy, yellow.

Leaves with central mid-vein and smaller veins branching from this.

Rorippa

Leaves with central mid-vein and smaller veins branching from this.

Base of petiole expanded; plants under 4 dm tall.

Ranunculus

Base of petiole expanded; plants under 4 dm tall.

Base of petiole not expanded; plants large, 5 dm tall or taller.

Hibiscus

Base of petiole not expanded; plants large, 5 dm tall or taller.

Leaves with several prominent rib-like veins running from base to apex.

Alismaceae

Leaves with several prominent rib-like veins running from base to apex.

Leaves with blunt lobes; flower conspicuous, purple, not on a fleshy axis enclosed in a leaf-like sheath.

Pontederia

Leaves with blunt lobes; flower conspicuous, purple, not on a fleshy axis enclosed in a leaf-like sheath.

Leaves usually with sharp lobes; flowers individually inconspicuous, on a fleshy axis snclosed in a leaf-like sheath.

Peltandra

Leaves usually with sharp lobes; flowers individually inconspicuous, on a fleshy axis snclosed in a…

Leaves large (2 dm long or more), coming out of stout underground stems.

Nuphar

Leaves large (2 dm long or more), coming out of stout underground stems.

Leaves toothed; veins of leaf irregular.

Centella

Leaves toothed; veins of leaf irregular.

Leaves entire; veins of leaf nearly parallel.

Heteranthera

Leaves entire; veins of leaf nearly parallel.

"a poisonous plant, monk's-hood, wolf's-bane."-Whitney, 1902

Aconite

"a poisonous plant, monk's-hood, wolf's-bane."-Whitney, 1902

Plant small, less than 4dm tall; flowers yellow.

Caltha

Plant small, less than 4dm tall; flowers yellow.

Plant large, over 5dm tall; flowers large, white, pink, or purplish.

Hibiscus

Plant large, over 5dm tall; flowers large, white, pink, or purplish.