_Cotyledons._ The foliar portion or first leaves (one, two, or more) of the embryo as found in the seed.

_Crateriform._ In the shape of a saucer or cup, hemispherical or more shallow.

_Creeping._ Running along or under the ground and rooting.

_Crenate._ Dentate with the teeth much rounded.

_Crenulate._ Finely crenate.

_Crested, Cristate._ Bearing an elevated appendage resembling a crest.

_Crown._ An inner appendage to a petal, or to the throat of a corolla.

_Cruciate._ Cross-shaped.

_Crustaceous._ Of hard and brittle texture.

_Cucullate._ Hooded or hood-shaped; cowled.

_Culm._ The peculiar stem of sedges and gra.s.ses.

_Cuneate._ Wedge-shaped; triangular with the acute angle downward.

_Cuspidate._ Tipped with a _cusp_, or sharp and rigid point.

_Cylindraceous._ Somewhat or nearly cylindrical.

_Cyme._ A usually broad and flattish determinate inflorescence, i.e.

with its central or terminal flowers blooming earliest.

_Cymose._ Bearing cymes or cyme-like.

_Deciduous._ Not persistent; not evergreen.

_Decompound._ More than once compound or divided.

_Dec.u.mbent._ Reclining, but with the summit ascending.

_Decurrent_ (leaf). Extending down the stem below the insertion.

_Decurved._ Curved downward.

_Decussate._ Alternating in pairs at right angles, or in threes.

_Definite._ Of a constant number, not exceeding twenty.

_Deflexed._ Bent or turned abruptly downward.

_Dehiscent._ Opening regularly by valves, slits, etc., as a capsule or anther.

_Deltoid._ Shaped like the Greek letter ?.

_Dentate._ Toothed, usually with the teeth directed outward.

_Denticulate._ Minutely dentate.

_Depressed._ Somewhat flattened from above.

_Di-, Dis-._ A Greek prefix signifying two or twice.

_Diadelphous_ (stamens). Combined in two sets.

_Diandrous._ Having two stamens.

_Dicarpellary._ Composed of two carpels.

_Dichotomous._ Forking regularly by pairs.

_Dicotyledonous._ Having two cotyledons.

_Didymous._ Twin; found in pairs.

_Didynamous_ (stamens). In two pairs of unequal length.

_Diffuse._ Widely or loosely spreading.

_Digitate._ Compound, with the members borne in a whorl at the apex of the support.

_Dimerous_ (flower). Having all the parts in twos.

_Dimidiate._ In halves, as if one half were wanting.

_Dimorphous._ Occurring in two forms.

_Dicious._ Unis.e.xual, with the two kinds of flowers on separate plants.

_Discoid._ Resembling a disk. _Discoid head_, in Compositae, one without ray-flowers.

_Disk._ A development of the receptacle at or around the base of the pistil. In Compositae, the tubular flowers of the head as distinct from the ray.

_Dissected._ Cut or divided into numerous segments.

_Dissepiment._ A part.i.tion in an ovary or fruit.

_Distichous._ In two vertical ranks.

_Distinct._ Separate; not united, evident.