What's that plant?

Flowers Red to Red-Violet

Plant a thistle with spines on leaves and under flower
Leaves all green; stems often white-woolly	Cobweb thistle
Leaves with white mottling; stems not white-woolly	Milk thistle
Plant not a thistle; no spines present
Leaves opposite each other
Flowers red purple	Pitcher sage
Flowers scarlet; found near water	Scarlet monkey flower
Leaves alternate
Flowers in a tight, terminal cluster	Chaparral Indian paintbrush
Flowers delicate, occurring singly	Indian pink
Leaves all at the base; plant with an onion odor	Wild onion