ACTIVITY 7 Flashcards
2 TYPES OF LEAVES
in terms of vein
- Microphyllous (single vein w/o leaf gap)
- Megaphyllous (multiple veins w leaf gap)
3 main parts of the leaf
- Lamina
- Petiole
- Stipule
5 parts of the lamina
- base
- apex
- midrib
- veins
- margin
LEAF internal structure
if may spongy - dicot
no spongy - monocot
If 2 sides of the leaf differ morphologically?
if the same?
+ other name
different: bifacial (dorsiventral)
same: unifacial (isobilateral)
if leaf has petiole?
if none?
petiolate
sessile
if leaf has stipules?
if none?
stipulate
exstipulate
responsible for multiplication after animal grazing
ligule
outgrowths at the junction of leaf sheath with lamina
ligule
3 types of leaf vennation
pinnately netted
palmately netted
parallel
MOST OF THE TIME, dicots and monocots are:
- petiolate or sessile?
- stipulate or exstipulate?
- bifacial or unifacial?
DICOTS:
- petiolate
- stipulate
- bifacial
MONOCOTS:
- sessile
- exstipulate
- unifacial
MOST COMMON overall shapes of leaves
- acicular
- linear
- oblong
- elliptic
- lanceolate
- cordate
MOST COMMON margins of leaves
- entire
- crenate
- crenulate
- serrate
MOST COMMON apex of leaves
- obtuse
- rounded
- acute
- cuspidate
MOST COMMON base shape of leaves
- cuneate
- cordate
- sheathing
- oblique
what is LEAF COMPOSITION
division of lamina into 1 or more several blades
OR
1 petiole divides into smaller leaflets
LEAF COMPOSITION (6)
- simple
- trifoliately compound
- pinnately compound
- palmately compound
- bipinnately compound
- polypinnately compound
what is PHYLLOTAXY
arrangement of leaves along stem
PHYLLOTAXY (5)
- alternate distichous
- alternate spiral
- opposite decussate
- opposite non-decussate
- whorled
alternate (1 leaf / node)
opposite (2 leaves / node)
whorled (3 or more leaves / node)
spiral (each leaf slightly rotates)
distichous & non-decussate (parallel)
decussate (perpendicular)
MODIFIED LEAVES (9)
- Bracts (colored non-photosynthetic leaves that attract pollinators for small flowers)
- Bulb scale (scale-like storage leaf attached to bulb stem)
- Spine (pointed leaf or leaf part)
- Swollen petiole (enlarged + bouyant petiole)
- Bud scale (small leaf forming tight layer around stem tip)
- Leaf tendril (coiled leaf)
- Pitcher leaf
- Pseudostem (overlaping leaf bases that look like a stem)
- Succulent leaf (thick and fleshy leaf)
