Which plant is described as forming dense patches in shaded areas with blueish-purple trumpet flowers?

The plant that forms dense patches in shaded areas and is characterized by blueish-purple trumpet flowers is indeed Ground Ivy. This plant, also known as Creeping Charlie, thrives in moist, shaded environments and is well-known for its distinctive appearance and growth habit. The bluish-purple flowers that it produces are tubular in shape, resembling trumpets, which helps in attracting pollinators.

Ground Ivy can quickly spread to form dense colonies, out-competing other plants and making it a common sight in lawns and shaded gardens. This growth pattern is particularly relevant for understanding its ecological interactions and management as a weed in ornamental and turf settings. The other options do not share these characteristics: Annual bluegrass does not produce trumpet-shaped flowers, Florida betony tends to have a more upright growth and distinct flowers, and hop clover has yellow flowers, which make them unsuitable choices for this description.