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Terminology 20160313
Glossary of 123 common plant part terms
123
Biology
Undergraduate 2
03/13/2016

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Term
achene
Definition
dry, one-seeded indehiscent fruit with seed attached to ovary wall at one point (e.g., sunflower)
Term
actinomorphic
Definition
individual parts of whorl are alike; type of radial symmetry
Term
alternate
Definition
arrangement with only one leaf inserted at a node
Term
androecium
Definition
the male reproductive parts of a flower
Term
anther
Definition
pollen producing part of the flower
Term
anthesis
Definition
when flower parts are open and receptive to pollination
Term
apex
Definition
the tip, for example, for a leaf, the farthest region from the petiole
Term
aquatic plant
Definition
plant that normally grows in water
Term
banner
Definition
upper petal of Faboideae in the family Fabaceae
Term
basal
Definition
arrangement of leaves arising from the base of the plant
Term
base
Definition
the bottom end, for example, for a leaf blade, the region nearest the petiole
Term
berry
Definition
fleshy fruit from a single pistil with often many seeds (e.g., tomato)
Term
bilabiate
Definition
with two lip
Term
bipinnate
Definition
twice pinnate, i.e., a decompound leaf with primary divisions divided again
Term
blade
Definition
the main expanded flat portion of a leaf (in contrast to petiole and stipules)
Term
bract
Definition
a modified leaf near a flower (think of a poinsettia or a bougainvillea)
Term
bud
Definition
the rudimentary unexpanded state of a stem, leaf, or flower
Term
calyx
Definition
outer series of the floral envelope
Term
canescent
Definition
surface white or gray short hairs
Term
carpel
Definition
part of pistil from one sporophyll; usually the highest number of the stigma lobes, styles, and locules
Term
caryopsis
Definition
dry, one-seeded indehiscent fruit with seed coat fused to pericarp (e.g., wheat)
Term
cleft
Definition
cut or split about half
Term
column
Definition
united filaments in Malvaceae or coalesced style and filaments in Orchidaceae
Term
complete
Definition
flower has sepals, petals, stamens, and pistils
Term
compound
Definition
leaf completely divided into two or more distinct segments (leaflets)
Term
cordate
Definition
heart
Term
corolla
Definition
inner series of the floral envelope
Term
costapalmate
Definition
leaf in some palmate leaved palms in which there is a definite midrib or petiole extension causing a curving
Term
crenate
Definition
toothed along the margin with but not sharply toothed
Term
cyathium
Definition
inflorescence in Euphorbia with unisexual flowers in a cup
Term
cyme
Definition
branched inflorescence in which terminal flower blooms first which makes it determinate
Term
deciduous
Definition
plant with leaves that fall at the end of the growing season
Term
dehiscence
Definition
opening by definite pores or slits to discharge the contents
Term
disc flower
Definition
regular tubular flowers of Asteraceae
Term
dissected
Definition
deeply divided into many narrow segments
Term
distichous
Definition
arrangement of leaves in two vertical rows
Term
drupe
Definition
fleshy, indehiscent fruit with a stony endocarp and usually one seed (e.g., peach)
Term
elliptical
Definition
a narrow oval, widest at the middle and the ends equally narrow
Term
entire
Definition
continuous leaf margin, not toothed or lobed
Term
evergreen
Definition
bearing green leaves throughout the year
Term
filament
Definition
stalk that supports the anther
Term
floret
Definition
small flower in a cluster; in Poaceae a specialized structure containing flower; in Asteraceae, in a head
Term
flower
Definition
the reproductive organ of a plant, specifically of monocots and dicots
Term
glabrous
Definition
surface smooth, hairless
Term
glaucous
Definition
surface covered with a whitish or bluish waxy coating
Term
groundcover
Definition
plant that normally grows close to the ground or that is managed to cover an area
Term
gynoecium
Definition
the female reproductive parts of a flower
Term
head
Definition
dense cluster of sessile or subsessile flowers
Term
herb
Definition
plant with no woody stem and not a palm
Term
imperfect
Definition
unisexual, a flower with only male (staminate) or female (pistillate) parts
Term
inferior
Definition
the perianth arises above the ovary (epigynous flower)
Term
inflorescence
Definition
a group of flowers attached together on a plant
Term
keel
Definition
fused lower petals of Faboideae in the family Fabaceae
Term
lanceolate
Definition
lance
Term
leaf
Definition
generally green, flattened photosynthetic organ of a plan which generally does not produce buds or stems
Term
leaflet
Definition
a division of a compound leaf
Term
legume
Definition
fruit dry, dehiscent, with usually several to many seeds in a single cell and one line of dehiscence
Term
linear
Definition
narrow, flat shape with parallel sides, at least 4 times longer than wide
Term
locule
Definition
cell or compartment of ovary filled with ovules
Term
margin
Definition
the edge or outline or profile of a leaf blade
Term
midrib
Definition
the central rib of a leaf
Term
netted veined
Definition
leaf veins interconnected to form a net (reticulate)
Term
oblanceolate
Definition
inversely lance
Term
oblong
Definition
two to four times longer than broad with nearly parallel sides
Term
obovate
Definition
inversely egg
Term
opposite
Definition
arrangement with two leaves inserted opposite each other on the stem
Term
ovary
Definition
contains the ovules and forms a fruit
Term
ovate
Definition
egg
Term
ovule
Definition
structure that develops into the seed
Term
palm
Definition
plant in the palm family, Arecaceae, not a true tree
Term
palmate
Definition
lobed, veined, or divided (palmately compound) from a common point, like the fingers of a hand
Term
panicle
Definition
branched inflorescence with flowers maturing from the bottom which makes it indeterminate
Term
pappus
Definition
modified calyx of Asteraceae, awns, scales, or bristles for dispersal by wind or in the fur of animals
Term
parallel veined
Definition
leaf veins small, generally parallel, all about the same size except the central vein
Term
pedicel
Definition
the stalk to an individual flower in an inflorescence
Term
peduncle
Definition
the stalk to an inflorescence or a solitary flower
Term
perfect
Definition
bisexual, a flower with male and female parts
Term
perianth
Definition
the non-reproductive portion of a flower that contains calyx and corolla
Term
petals
Definition
one of the individual parts of the corolla
Term
petiole
Definition
leaf stalk
Term
phyllary
Definition
bract in the involucre of Asteraceae
Term
pinna (pinnae)
Definition
a primary division of a pinnate or bipinnate leaf
Term
pinnate
Definition
compound leaf with leaflets on a rachis (may be odd pinnate or even pinnate)
Term
pistil
Definition
seed producing organ; ovary plus style (if present) plus stigma
Term
pollen
Definition
male spores
Term
pubescent
Definition
surface covered with hairs, especially short, soft hairs
Term
raceme
Definition
inflorescence with a single unbranched axis with flowers on pedicels, maturing from the bottom
Term
rachis
Definition
central axis of a compound leaf or of an inflorescence
Term
ray flower
Definition
strap
Term
receptacle
Definition
flattened disc in Asteraceae on which flowers are born
Term
rhizome
Definition
a horizontal stem that grows underground
Term
root
Definition
descending axis of a plant primarily used to absorb water and nutrients from ground and provide support
Term
rosette
Definition
dense radiating cluster of leaves usually at or near ground level
Term
samara
Definition
fruit dry at maturity, indehiscent, winged
Term
seed
Definition
mature ovule with embryo, coat, food supply, e.g., endosperm;
Term
sepals
Definition
one of the individual parts of the calyx
Term
serrate
Definition
toothed along the margin with minute, sharp, forward
Term
shrub
Definition
medium sized woody plant typically less than 3 m tall and/or with many main stems often spreading
Term
simple
Definition
leaf which is one undivided segment (may be lobed)
Term
spadix
Definition
spike with small flowers crowded on a thickened axis, e.g., Araceae
Term
spathe
Definition
large bract sheathing of enclosing an inflorescence, e.g., Araceae
Term
spike
Definition
inflorescence with a single unbranched axis with flowers sessile, maturing from the bottom
Term
spikelet
Definition
basic inflorescence unit of Poaceae; has two glumes and one or more florets
Term
spiral
Definition
arrangement of leaves not in vertical rows but spiralling up the stem
Term
stamen
Definition
anther plus filament
Term
stem
Definition
the main body or supportive structure of a plant that can produce roots, stems, leaves, and flowers
Term
stigma
Definition
part of the pistil that receives the pollen
Term
stipules
Definition
pair of appendages at the base of the petiole or leaf
Term
stolon
Definition
a horizontal stem that grows aboveground
Term
strigose
Definition
surface covered with stiff, appressed hairs
Term
style
Definition
stalk
Term
superior
Definition
the perianth arises from below the ovary (hypogynous flower)
Term
sympetalous
Definition
petals united at least at the base (opposite of gamopetalous)
Term
tendril
Definition
a slender, often coiling organ of support
Term
tepals
Definition
part of the perianth that is not distinguished as petals or sepals, e.g., in Liliaceae
Term
tomentose
Definition
surface covered with tangled, wool
Term
tree
Definition
large woody plant typically at least 3 m tall and/or with one or a few main trunks
Term
trifoliolate
Definition
a compound leaf divided into three segments
Term
turfgrass
Definition
plant in the grass family, Poaceae, that is mowed to make a groundcover
Term
vine
Definition
plant that climbs or scrambles and cannot normally support itself
Term
whorled
Definition
arrangement with three or more leaves arising at a node
Term
woody plant
Definition
plant with a hard stem due to secondary xylem produced by vascular cambium and bark on the outside
Term
zygomorphic
Definition
irregular flower; parts of one whorl not alike; may be bilaterally symmetrical
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