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

Micranthemum

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

Main rib of normal lleaf running from base to apex.

Midrib

Main rib of normal lleaf running from base to apex.

Leaves opposite, with wavy margins or angularly toothed.

Mikania

Leaves opposite, with wavy margins or angularly toothed.

Calyx bearing no crest.

Mimulus

Calyx bearing no crest.

Ending in an abrupt, fine, slender tip.

Mucronate

Ending in an abrupt, fine, slender tip.

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.

Leaves with small, orange wax glands on te lower surface when examined with lens; leaves usually prominently toothed.

Myrica

Leaves with small, orange wax glands on te lower surface when examined with lens; leaves usually prominently…

Submerged leaves whorled, stems usually very lax.

Myriophyllum

Submerged leaves whorled, stems usually very lax.

Leaves with dilated bases.

Najas

Leaves with dilated bases.

Flowers white.

Nasturtium

Flowers white.

Long needles an two to several fascicles.

Needles

Long needles an two to several fascicles.

A shrub with leaves that are short needles, arranged in two ranks along twig, or sometimes appressed to twig; not in fascicles.

Needles

A shrub with leaves that are short needles, arranged in two ranks along twig, or sometimes appressed…

Leaves large, 2 dm or more in diameter, impossible to wet; flowers solitary, showy, yellow.

Nelumbo

Leaves large, 2 dm or more in diameter, impossible to wet; flowers solitary, showy, yellow.

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…

Individual leaflets of compud leaves also lobed or divided.

Neobeckia

Individual leaflets of compud leaves also lobed or divided.

Flowers conspicuous, white, 4-petaled.

Neobeckia

Flowers conspicuous, white, 4-petaled.

The places on the stems that normally bear leaves.

Nodes

The places on the stems that normally bear leaves.

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.

Flowers white; leaf-blade round.

Nymphaea

Flowers white; leaf-blade round.

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.

Trees with swollen bases; fruit that drupe, longer than wide.

Nyssa

Trees with swollen bases; fruit that drupe, longer than wide.

Lanceolate in outline but with the broadest part toward the apex.

Oblanceolate

Lanceolate in outline but with the broadest part toward the apex.

Longer than broad and with nearly parallel sides.

Oblong

Longer than broad and with nearly parallel sides.

Ovate in outline butwith hte broadest portion toward the apex.

Obovate

Ovate in outline butwith hte broadest portion toward the apex.

Shaped like a pyramid with the broad end uppermost.

Obpyramidal

Shaped like a pyramid with the broad end uppermost.

Blunt or rounded at the tip.

Obtuse

Blunt or rounded at the tip.

A tubular sheath present on the stem just above the base of the leaves of docks and smartweeds. It is formed of the fused stipules.

Ocrea

A tubular sheath present on the stem just above the base of the leaves of docks and smartweeds. It is…

Coming off opposite each other at the same level on the axis.

Opposite

Coming off opposite each other at the same level on the axis.

Circular or round.

Orbicular

Circular or round.

Plants smaller; not wite-powdery above; leaves shed water easily; flowers along fleshy spike enclosed in a leafy sheath.

Orontium

Plants smaller; not wite-powdery above; leaves shed water easily; flowers along fleshy spike enclosed…

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.

The basal portion of the pistil in which the seeds or ovules are bourne.

Ovary

The basal portion of the pistil in which the seeds or ovules are bourne.

Having an outline like that of an egg, with the broadest part downward.

Ovate

Having an outline like that of an egg, with the broadest part downward.

Fruit flattened dorsally; fruit prominently winged.

Oxypolis

Fruit flattened dorsally; fruit prominently winged.

An irregularly compund flower cluster with stalked flowers.

Panicle

An irregularly compund flower cluster with stalked flowers.

Spikelets not inflated as base.

Panicum

Spikelets not inflated as base.

Leaves not flat-floating; inflourescences large and conspicuous.

Paspalum

Leaves not flat-floating; inflourescences large and conspicuous.

A stalk of a single flower.

Pedicel

A stalk of a single flower.

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…

Petiole attached notat margin of leaf but in the middle of the lower surface.

Peltate

Petiole attached notat margin of leaf but in the middle of the lower surface.

Flowers greenish, 5-petaled.

Penthorum

Flowers greenish, 5-petaled.

The calyx and corolla taken together.

Perianth

The calyx and corolla taken together.

Leaves, at least the younger onces, densely hairy or wooly beneath.

Persea

Leaves, at least the younger onces, densely hairy or wooly beneath.

A member of the inner circle of flower parts; often colored and showy.

Petal

A member of the inner circle of flower parts; often colored and showy.

The stalk of a leaf.

Petiole

The stalk of a leaf.

Leaves wide to the base, without petioles.

Pistia

Leaves wide to the base, without petioles.

The seed-bearing part of a flower.

Pistil

The seed-bearing part of a flower.

Buds covered with overlapping scales; fruit warty.

Planera

Buds covered with overlapping scales; fruit warty.

Leaves aromatic when crushed.

Pluchea

Leaves aromatic when crushed.

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.

flowers in terminal clusters which may be compound.

Polygala

flowers in terminal clusters which may be compound.

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.

Sheaths around stem above each point of leaf-attachment; flowers white to red, not fragrant.

Polygonum

Sheaths around stem above each point of leaf-attachment; flowers white to red, not fragrant.

Plant with narrower leaves, none basal; flowers sessile, in terminal spikes.

Polygonum

Plant with narrower leaves, none basal; flowers sessile, in terminal spikes.

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 mostly basal, heart shaped; flowers purple.

Pontederia

Leaves mostly basal, heart shaped; flowers purple.

Flowers many; leaves large, over 10cm long.

Pontederia

Flowers many; leaves large, over 10cm long.

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-base narrow, sometimes with stipules.

Potamogeton

Leaf-base narrow, sometimes with stipules.

Submerged leaves with simple divisions.

Proserpinaca

Submerged leaves with simple divisions.