Bidens alba is also called Beggarticks. 

The second photo shows the reason it is called Spanish Needles. 

Family Asteraceae.  Extremely common in most disturbed habitats. 

Wikipedia Link

Scientific Name: Balduina angustifolia

Synonym: Coastal Plain Honeycombhead

Native to Florida

Photos by Carol Foil

Link to Florida Native Plant Society

Scientific Name: Tradescantia ohiensis

Synonyms: Bluejacket

Native to Florida

Photo by Carol Foil

Flowers vary from deep blue to whitish blue

Link to Florida Native Plant Society