A bulb is a thin stem surrounded by layered thick leaf bases, as in an onion.
A corm is a short thick stem at ground level. It looks like a bulb but is all stem.
A rhizome is a horizontal stem, usually underground. It looks like a root but has stem structure, including axillary buds.
A stolon is an above-ground rhizome, or “runner.”
A tuber is an extra-thick underground stem.
Pubescence (= hairs)
Compound and lobed leaves
A compound leaf looks like a stem with leaves on it, but the axillary bud is at the base of the entire unit. The “leaves” on a compound leaf are leaflets with no axillary buds of their own. A pinnately compound leaf has the leaflets along a stalk (rachis). A palmately compound leaf has the leaflets radiating. If a leaf is not cut all the way into separate leaflets, it is pinnately or palmately lobed, that is, there is a web of leaf tissue between the lobes. Click on the thumbnails to enlarge them.
One leaf per node = alternate
Two leaves per node = opposite
Three or more = whorled
1. Leaves attached two-by-two are:
2. A leaf margin resembling sawteeth is:
3. A compound leaf where the leaflets radiate like spokes is:
A. Pinnately compound
C. Palmately lobed
D. Palmately compound
4. Fuzzy like felt:
7. Roots along the stem above the ground:
8. Shaped like a thumb tack:
9. Another name for axillary buds:
A. Lateral buds
B. Terminal buds
C. Bundle traces
D. Leaf scars
10. Immediately above every leaf attachment:
A. Terminal bud
C. Axillary bud
D. Leaf scar
11. Paired outgrowths at petiole base:
D. Lateral buds
12. Stem between leaf attachment points:
13. Leaf blade with notch at tip:
14. Leaf blade shaped like a candle flame:
15. Upside-down egg, widest above middle:
16. A leaf with leaflets along what looks like a stem (but the leaflets do not have axillary buds) is:
A. Palmately compound
B. Pinnately lobed
D. Pinnately compound
17. Describe each leaf below. shape? Margin? Tip? Is it compound? Pubescence?