17024786
Description
Flashcards by Wes Smalley, updated more than 1 year ago
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Created by Wes Smalley
almost 6 years ago
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| Question | Answer |
| Poaceae | Grass family. Leaves make open sheaths around a hollow stem. Joints at each node. Bisexual flowers or monecious in glumes |
| Cyperaceae | Sedge family. Triangular, solid Stem! Closed leaf sheaths Flower spikelets bi/unisexual, usually monecious w/ reduced tepals |
| Juncaceae | Rush family Round, solid stems Leaves flat or round, sheath fused or not. Flowers bisexual, radial, w/ similar sepals and petals. |
| Easy way to distinguish between the graminoid families. | Sedges have edges, Rushes are Round, Grasses have nodes from the top to the ground. |
| Taxonomically, what are graminoids? | Monocots |
| Leaf Sheathe | Lower portion of the leaf blade wraps around the stem. |
| Monecious | Male and Female flowers occur on the same plant. |
| Why 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. |
| Cool Season Grasses | C3 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). |
| Warm Season Grasses | C4 Photosynthesis, Grow and reproduce in warm months, Most spp. of Panicgrass (Panicum/Dicanthelium), Gama grass (Bouteloua), and Crowngrass (Paspalum) |
| Pros and Cons of C4 vs C3 photosynthesis | Better adapted to hot, dry climates, but requires more energy because it interacts w/ the Calvin Cycle |
| How do sedge leaf sheaths compare to those of grass? | Sedges have fused leaf sheaths, while grass has unfused sheaths. |
| How do rush stems compare to grass stems? | Grass stems are hollow and jointed, while rush stems are solid and unjointed. |
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