Brassica rapa (Field mustard)

3/20/2012 · Gunpowder Falls State Park, Phoenix Rd, Phoenix, Maryland · ≈ 15 × 10″ (38 × 25 cm)

4/4/2012 · North Central Railroad Trail, End, Phoenix, Maryland · ≈ 9 × 6″ (22 × 14 cm) ID is uncertain

5/24/2012 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 2½ × 4″ (6.7 × 10 cm)

3/20/2012 · Gunpowder Falls State Park, Phoenix Rd, Phoenix, Maryland · ≈ 4 × 3½″ (11 × 9.2 cm)

4/4/2012 · North Central Railroad Trail, End, Phoenix, Maryland · ≈ 8 × 7″ (19 × 17 cm) ID is uncertain

Kingdom	Plantae	Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin)
Subkingdom	Tracheobionta	Vascular plants—plants with a “circulatory system” for delivering water and nutrients
Division	Magnoliophyta	Flowering plants, also known as angiosperms
Class	Magnoliopsida	Dicotyledons—plants with two initial seed leaves
Subclass	Rosidae	Roses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more
Order	Brassicales	Mustard, cabbage, caper, papaya, nasturtiums, many others; most produce mustard oil
Family	Brassicaceae	Mustards, cabbages
Genus	Brassica	A Latin name for “cabbage”
Species	rapa	An old Italian name for turnips