what does pineapple weed mean?

PINEAPPLE WEED as NOUN

Meaning
- annual aromatic weed of Pacific coastal areas (United States and northeastern Asia) having bristle-pointed leaves and rayless yellow flowers
Synonym(s)
- Matricaria matricarioides (what does Matricaria matricarioides mean?)
- rayless chamomile (what does rayless chamomile mean?)
Hypernyms(s) pineapple weed is a kind of… Example: animal is a hypernym of mammal, plant is a hypernym of flower
- herb (what does herb mean?)
- herbaceous plant (what does herbaceous plant mean?)