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Leaves (Morphology and Anatomy of Other Leaf Types (Tendrils (peas,…
Leaves
Morphology and Anatomy of Other Leaf Types
Succulent
thick and fleshy
favors water concervation
family Crassulaceae
family Portulcaceae
family Aizoaceae
Bud Scales
primary protection
small
rarely compound
Spines
cacti
modified leaves of axillary buds
no mesophyll parenchyma
no vascular tissue
Tendrils
peas
cucumbers
squash
grow indefinitely
capable of sensing touch
Leaves with Kranz Anatomy
c4 photosynthesis
no palisade parenchyma
no spongy mesophyll
Insect Traps
digest insects
obtain nitrogen
passive traps
Nepenthes
Darlingtonia
Sarracenia
active traps
leaves of sundew
Venus' flytraps
Sclerophyllous Foliage Leaves
produce more sugars
barberry
holly
Agave
Yucca
Leaves of Conifers
sclerophylls
thick cuticle
thick cell walls
scale-like leaves
Junipers
Cypresses
Arborviate
External Structure of Leaves
leaf blade
dorsal surface
ventral surface
simple
one part
Poplar
Oak
compound
multiple parts
Rose
Virginia Creeper
Petiole
self-shading
leaf base
abscision zone
leaf scar
no Petiole
Sessile leaves
Aeonium
Sheathing leaf base
palms
birds-of -paradise
veins
reticulate venation
Monocots
entire
dentate
divided
lacerate
serrate
Internal Structure of Leaves
Epidermis
water loss
transpiration
guard cells
trichomes
hairy
provide shade
stomata
Mesophyll
palisade parenchyma
upper surface
maximum photosynthesis
spongy medophyll
Vascular Tissue
midrib
xylem
upper pholem
lateral veins
support leaf blade
minor veins
releasing water
bundle sheath
bundle sheath extension
elongated fibers
Pertiole
leaf traces
celery
water lilies
rhubarb
palms
stipules
2 small flaps of tissue at base
Initiation and Development of Leaves
Basal Angiosperms and Eudicots
leaf primordium
bulk of midrib
grows upward
Monocots
initiated by expansion of shoot apical meristem
hood-like shape
lamina
broad, expanded
no sure shape
grasses
lilies
Concepts
