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BOTANY 400
systematics terminology
60
Plant Sciences
Not Applicable
09/11/2005

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Term
receptacle
Definition
floral axis, modified stem holding the flower, off of which come the four whorls. can become elongated and cup-like in some species.
Term
pedicel/peduncle
Definition
floral stalk- stem holding flower
Term
perianth
Definition
outer structure, protects sexual parts of plant. composed of two whorls: sepals and petals. can also be composed of tepals.
Term
sepal
Definition
lowermost whorl; covers unopened flower/protects petals. aka: calyx
Term
petal
Definition
second whorl; attracts pollinating agents (decorative function?); not always present in wind-pollinated species. aka: corolla
Term
androecium
Definition
all of a flower's stamen
Term
stamen
Definition
"male"; sexual. composed of anther and filament.
Term
anther
Definition
part of stamen; sac-like appendage at end of stamen that produces pollen
Term
filament
Definition
part of stamen; tube-like appendage for pollen transport up the stamen
Term
inflorescence
Definition
cluster of flowers
Term
syncarpic
Definition
many carpels fuse to form one pistil; number of carpels usually signified by number of stigmatic lobes
Term
apocarpic
Definition
# of pistils = # of carpels. can have many pistils. ex: 3 pistils = 3 carpels.
MARSH MARIGOLD
Term
monocarpic
Definition
one carpel = one pistil
Term
marginal placentation
Definition
ovules connect to ovary wall in one spot. all apocarpic plants.
Term
Juniperus (juniper, red cedar)
Definition
two types of leaves: scale or needle. blue berry-like cones.
Term
Thuja (white cedar, arborvitae)
Definition
branchlets flattened, scale-like
Term
Picea (spruce)
Definition
alternate, four sided rigid leaves
Term
Pinus (pine)
Definition
leaves in clusters of 2-5. long and thin.
Term
Tsuga (hemlock)
Definition
leaves flattened, soft, and of two types; spreading lateral and small appresed (pointing out of stem)
Term
Taxus (yew)
Definition
leaves flattened, needle-like, deccurent (extend down stem, stem looks green)
Term
Larix (larch, tamarack)
Definition
leaves in clusters of 10+, small cones
Term
Abies (fir)
Definition
leaves alternate/spiral giving branch a tube-like shape, short needles.
Term
raceme
Definition
indeterminate INFL., alternate arrangement
Term
spike
Definition
indeterminate INFL., sessile raceme
Term
umbel
Definition
indeterminate INFL., flat-top arrangement
Term
panicle
Definition
indeterminate INFL., compounded raceme
Term
head
Definition
indeterminate INFL., stem head flattens out, becomes base for INFL., arranged in line
Term
dichasium
Definition
determinate INFL., palmately branched
Term
cyme
Definition
determinate INFL., compounded dichasium
Term
monochasium
Definition
determinate INFL., only one branching
Term
scirpoid
Definition
determinate INFL., compounded monochasium
Term
simple fruit
Definition
formed from one pistil
Term
dehiscent
Definition
dry fruits; open at maturity to shed seeds
Term
follicle
Definition
dry, dehiscent fruit from one carpel that splits along one line only. MARSH MARIGOLD.
Term
capsule
Definition
dry, dehiscent fruit from many carpels
Term
indehiscent
Definition
dry fruits that don't open at maturity
Term
achene
Definition
one seeded indehiscent fruit, seed attatches to fruit wall at a single point
Term
nut
Definition
indehiscent fruit with hardened walls
Term
aggregate fruit
Definition
developed from many pistils on the same flower
Term
multiple fruit
Definition
developed from many pistils, sometimes other parts, from many flowers
Term
axile placentation
Definition
ovary walls sectioned, ovules attatched to center, not walls
Term
parietal placentation
Definition
ovules attached to walls
Term
free central placentation
Definition
ovules attatched to center, not walls. no segmentation of ovary.
Term
basal placentation
Definition
ovules attach to ovary at base
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