This is a perennial herb producing a red stem 6-12 in.

It is an annual herb producing a slender, hairy stem.

This is an annual herb producing a spreading stem up to about 40 centimeters long.

This plant in general is a perennial herb producing one to three stems up to half a meter tall.

It is a small annual herb producing a slender stem up to 15 centimeters long.

This species is a colonial perennial herb producing stems up to 2.5 feet tall.

It is a small annual herb producing spreading stems up to about 11 centimeters long.

This is a small perennial herb producing two or three leaves from a flat caudex.

This is an annual herb producing a thin stem 10 to 50 centimeters tall.

This herb produces a thin stem 12 centimeters to about a meter long.