Generically they are called "cactus" plants or "cacti"
a cactus
Cacti live in the deserts of the Americas and many have sharp spines. In Africa there are other plants, euphorbias for example, that resemble cacti but have thorns rather than spines.
That's a cactus
One of the many cactus species
The pointy things on a cactus are called spines.
A thistle is a plant that has sharp spines on it. There are certain types of finches and doves that eat it, as well as goats.
Yes. Both the male and female echidna have equally sharp spines.
its sharp spines
its sharp spines
No not true. Spines on plants are sharp needle like that protect the plants from any harm. I think cacti have spines
Spicules
No. Gorse is a land based plant, with yellow flowers and sharp spines (like a very thin cactus). Kelps are plants of the ocean.