Copy of `USGS - Northeast Wetland Flora`

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USGS - Northeast Wetland Flora Category: Agriculture and Industry Date & country: 30/06/2013, USA Words: 161

Pinna
The primary division of pinnate frond or leaf.

Pinnate
Divided once along an elongated axis into distinct segments.

Pinnatifid
Divided nearly to the axis.

Pistil
The ovule-producing part of the flower.

Pith
The central, often soft, part of a stem.

Plumose
Feathery.

Prostrate
Lying flat on the ground.

Raceme
A grouping of flowers along an elongated axis where each flower has its own stalk.

Rachis
The axis of a flowering branch or the cenral stalk of a compound leaf..

Ray
A flattened flower part in the aster family that is actually several petals fused together.

Receptacle
That part of the flower to which the sepals, petals, stamens, and pistils are usually attached.

Recurved
Curving downward.

Reflexed
Turned downward.

Reticulate
Like a net.

Retrorse
Pointing downward.

Revolute
Turned under along the edges.

Rhizome
An underground, horizontal stem.

Ribbed
Bearing ridges.

Rosette
A cluster of leaves around the base of the plant.

Samara
An indehiscent winged fruit.

Scale
A tiny, usually dry, leaflike structure (for example, the structure that subtends each flower in a grass, sedge, or rush).

Septate
With cross-walls.

Sessile
Without a stalk.

Setose
Bearing bristles.

Sheath
The base of a leaf that encircles the stem.

Smooth
Not rough to the touch.

Sorus
A structure found in ferns that contains the spore-producing sporangia.

Spadix
A fleshy axis in which flowers are embedded.

Spathe
A large bract subtending or sometimes enclosing a cluster of flowers.

Spatulate
Shaped like a spatula, broadest at the tip and tapering to the base.

Spike
A grouping of flowers along an elongated axis where each flower lacks a stalk.

Spikelet
A small spike.

Spinulose
Bearing small spines.

Sporangia
Structures that bear spores.

Spore
A microscopic reproductive body in ferns and fern allies.

Sporophyll
A leaf that bears spores.

Spur
A slender, backward-pointing part of some flowers, or short, stout, spine-like branches.

Stamen
The pollen-producing organ of a flower.

Stigma
The terminal part of a pistil.

Stipule
A green, often leaf-like, structure found at the base of some leaves.

Stolon
A horizontal stem lying on the surface of the soil.

Striate
With parallel lines.

Style
That part of the pistil between the ovary and the stigma.

Subglobose
Nearly round, but slightly flattened.

Subtend
To extend under; found at the base of.

Subulate
Narrowed to a short point.

Succulent
Fleshy.

Superior
Referring to the position of the ovary when it is above the point of attachment of sepals, petals, stamens, and pistils.

Sutures
Seams, areas where splitting ocurs.

Tendril
A device, usually coiled, that enables some vines to climb.

Terete
Round in cross-section.

Ternate
Divided into 3's.

Thallus
The body of the plant in the family Lemnaceae.

Truncate
Cut straight across.

Tuber
A thickened, underground stem that stores food.

Tubercle
A wart-like structure.

Umbel
A cluster of flowers in which the flower stalks arise from the same level.

Undulating
Wavy.

Valvate
Placed edge to edge.

Valve
The section of a capsule; the wing of the fruit in Rumex.

Whorl
The arrangement of 3 or more structures at a point on the stem.