Grasses, sedges, and rushes — the graminoids — make up much of any meadow, prairie, wetland, and roadside, and almost none of any illustrator's portfolio. The reasons are understandable: no petals, dozens of near-identical leaves, and flowers so small they need a hand lens. But they are among the most rewarding subjects once their structure is understood, precisely because they are built of line and rhythm rather than color and mass. This guide covers how to tell the three families apart, the parts a plate must show, and how to draw a plant that is mostly lines.

Three Families, One Rhyme

The field mnemonic is old and reliable: sedges have edges, rushes are round, grasses have nodes (or joints) from the top to the ground.

• Grasses (Poaceae) have round or flattened, usually hollow stems with solid, swollen nodes at intervals — the "joints" — from which the leaves arise. Leaves are in two ranks, alternating on opposite sides of the stem.
• Sedges (Cyperaceae) have solid stems that are, in most genera, triangular in cross-section — roll one between your fingers and you feel the three edges. No swollen nodes. Leaves are in three ranks, spiralling around the stem.
• Rushes (Juncaceae) have round, solid or pith-filled stems, no nodes, and leaves that are often reduced to basal sheaths or round and stem-like themselves. Their tiny flowers, unlike grasses and sedges, have six small tepals and are recognizably flower-shaped under a lens.

Cut a stem and draw the cross-section as a detail; it settles the family at a glance and it is a conventional element of a graminoid plate.

The Parts of a Grass

A grass plant is built from a few repeated units, and the drawing depends on naming them:

• Culm — the flowering stem, made of hollow internodes separated by solid nodes.
• Sheath — the lower part of each leaf, wrapping the culm above the node. Whether the sheath edges overlap or are fused into a tube is a character.
• Blade — the free, flat (or rolled) part of the leaf, usually linear with parallel venation.
• Ligule — a small membranous flap or fringe of hairs on the inside of the leaf where sheath meets blade. It is one of the most important identification characters in grasses and is nearly always drawn as a magnified detail. Auricles — small ear-like projections at the same junction, present in some genera — are drawn with it.
• Inflorescence — a spike, raceme, or panicle of spikelets.
• Spikelet — the basic flowering unit: one or more tiny florets on a short axis, enclosed at the base by two bracts called glumes. Each floret is a flower wrapped in two more bracts, the lemma (outer) and palea (inner); inside are three stamens with dangling anthers and a pistil with two feathery stigmas. The lemma or glumes may carry a bristle, the awn.

A grass plate conventionally shows the habit, a magnified ligule, a spikelet with its glumes, a single floret opened out, and often a floret in section. Without the spikelet detail the plate is decorative; with it, it identifies the species. See the flower anatomy guide for how these bracts relate to the sepal-and-petal structure of other plants — they are the grass's replacement for both.

The Sedge Perigynium

In the largest sedge genus, Carex, each female flower is enclosed in a sac-like bract called the perigynium — a flask-shaped structure with a beak at the top through which the stigmas emerge. Perigynium shape, size, and the number of stigmas (two or three) are how Carex species are told apart, and a sedge plate that omits the perigynium has omitted the plant's identity. Draw it at high magnification, from the side and face, with the subtending scale beside it. Other sedges (Cyperus, Scirpus, bulrushes) have flattened or spiralling spikelets of overlapping scales; draw the spikelet and a single scale with its flower.

Drawing Long Linear Leaves

The blades are where grass drawings go wrong. The temptation is to draw each as two parallel lines meeting at a point; the result looks like a bundle of straws. A grass blade in life twists along its length, folds along its midrib, arches under its own weight, and shows one surface for part of its length and the other for the rest. Drawing habits that help:

• Draw the midrib first as a single curved line describing the blade's path through space — its arch and its twist — and only then add the two edges. The edges are parallel to the midrib in the leaf's own plane, but in projection they narrow wherever the blade turns edge-on.
• Show the twist. Most blades rotate a quarter- or half-turn between sheath and tip. Where the blade turns, one edge crosses the midrib in the drawing. Get that crossing right and the leaf is three-dimensional.
• Fold and keel. Many blades are V-shaped in section, with a keel below. Where the light falls on one face and not the other, a tonal difference along the midrib describes the fold with no outline at all.
• Vary the line. Thicker and darker where the blade is nearest and in shadow, thinner and lighter as it recedes. A uniform line weight flattens the whole plant.
• Parallel venation is suggested by a few fine lines along the blade, not drawn in full. The leaf vocabulary guide covers venation terms.

Draw fewer leaves than the plant has, choosing the ones that show the range of postures — an upright young blade, an arching mature one, a dead one curled at the base — and let the rest be implied. A drawing of every blade is a drawing of a haystack.

Composition for a Plant with No Flowers

The graminoid plate is a study in line and rhythm. The habit is tall and narrow, usually with the inflorescence at the top of a long culm and the leaves clustered lower; the page is portrait, and the drawing can use its full height. Details cluster along one side in a column. Because there is little tone and no color to speak of (many grass plates are ink), the design relies on the varying line weight and on the negative shapes between the blades — the shapes that a tangle of leaves makes with the white paper. Plan these shapes; do not let them be accidental. A graminoid plate that works is one where the eye can travel up the culm, around the panicle, and back down through the leaves without stalling.

Timing and Handling

Grasses flower briefly, and the anthers dangle out of the spikelet for only a day or two — the moment when the spikelet is most legible and most beautiful. Watch for it. After flowering, the spikelet closes and the fruit (the caryopsis or grain) develops; both stages belong on a thorough plate. Grasses press superbly and are the one group where a pressed specimen loses little, because they are already nearly two-dimensional — but press a few spikelets separately, spread open, and keep some in a small envelope unpressed for the three-dimensional detail drawings.

Starting Points

Begin with a large, distinctive grass whose spikelets are visible without a lens: a brome, a wild rye, an oat, or a cultivated wheat. Draw the habit, then the ligule, then a spikelet at 5×. Move to a Carex with a large perigynium once the grass structure is familiar. Then try a rush, and draw its six-tepaled flower — the moment when the "boring" graminoids reveal that they are flowers after all, and always were. The Gesture Lab includes grasses in its species pool for a reason: nothing trains a line like a plant made of nothing else.