THINGS THAT ARE NOT WHAT THEY SEEM

Tree means a plant with a woody trunk that survives from one season to the next.

tree

Herbs means a plant with a soft and succulent stem that, after flowering, withers away.

herb

Shrub means a woody plant of less size than a tree; a thicket of such plants

shrub

(There is no such thing as a banana tree.  Bananas do not grow on trees but rather develop on very large herbs.  What appears to be its trunk is actually made up of very large leaves in tubular configuration.)

1. The banana tree is not a tree.   It's a herb.
2. The bamboo tree is not a tree.  It's known to be the world's tallest grass.
3. The apple tree is not a tree.  It's a shrub. 
4. A cucumber is not a vegetable.  It's a fruit.
5. A Douglas fir tree is not a fir.  It's a pine.
6. A sea calf is not a calf.  It's a common seal.
7. A sea cow is not a cow.  It's a walrus or manatee.
8. A scarlet-tiger is not a tiger.  It's one of a family of moths.
9. A yellow-hammer is not a hammer.  It's a European bunting (allied to sparrow),  the male of which has a bright yellow head and neck.
10. A sea dog is not a dog.  It's a term used to call an "old sailor".
11. A firefly is not a fly.  It's a beetle.
12. A Welsh-rabbit is not a rabbit.  It's a melted cheese mixed with ale.
13. A bluebottle is not a bottle and not blue.  It's a species of fly.
14. A blindworm is not a worm and not blind.  It is a small slender limbless lizard, so named from the erroneous notion that is blind.
15. An English horn is not English and not a horn.  It's an alto oboe from France.
16. A panda bear is not a bear.  It's a raccoon's relative.
17. A sea fox is not a fox.  It's a variety of shark.
18. A dragon's-blood is not a blood nor a dragon.  It is the red juice of several South American and East Indian trees.
19. A prairie dog is not a dog.  It's a rodent.
20. A blind tiger is not a tiger and not blind.  It is a place where intoxicants are illegally sold.
21. A bottleneck is not a bottle and not a neck.  It's a narrow passage or a condition that impedes progress.
22. A horned toad is not a toad.  It is a lizard.
23. A Guinea pig is not a pig.  It's a tailless rodent mammal about seven inches in length and often used for medical experimentation.