Flashcards
Graminoids
Cards in this deck (13)
- 1PoaceaeGrass family.
Leaves make open sheaths around a hollow stem.
Joints at each node.
Bisexual flowers or monecious in glumes - 2CyperaceaeSedge family.
Triangular, solid Stem!
Closed leaf sheaths
Flower spikelets bi/unisexual, usually monecious w/ reduced tepals - 3JuncaceaeRush family
Round, solid stems
Leaves flat or round, sheath fused or not.
Flowers bisexual, radial, w/ similar sepals and petals. - 4Easy way to distinguish between the graminoid families.Sedges have edges,
Rushes are Round,
Grasses have nodes from the top to the ground. - 5Taxonomically, what are graminoids?Monocots
- 6Leaf SheatheLower portion of the leaf blade wraps around the stem.
- 7MoneciousMale and Female flowers occur on the same plant.
- 8Why is a grass' grain a fruit and not simply a seed?Seeds are ripened ovules. A fruit is a ripened ovary complete with layers of ovarian tissues.
- 9Cool Season GrassesC3 Photosynthesis,
Grow and reproduce in spring, fall, or late winter, but struggle or go dormant in heat.
Most spp of Rye (Elymus), Fescue (Festuca), and Bluegrass (Poa). - 10Warm Season GrassesC4 Photosynthesis,
Grow and reproduce in warm months,
Most spp. of Panicgrass (Panicum/Dicanthelium), Gama grass (Bouteloua), and Crowngrass (Paspalum) - 11Pros and Cons of C4 vs C3 photosynthesisBetter adapted to hot, dry climates, but requires more energy because it interacts w/ the Calvin Cycle
- 12How do sedge leaf sheaths compare to those of grass?Sedges have fused leaf sheaths, while grass has unfused sheaths.
- 13How do rush stems compare to grass stems?Grass stems are hollow and jointed, while rush stems are solid and unjointed.
Information
- Description
- This will be a shorter one. It's beyond the scope of Bio552 to get into the many genera of graminoids. We'll focus on vegetative characteristics and review questions as always. Don't forget to view the powerpoint for their importance to wildlife.
- Created by
- Wes Smalley
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