Myosurus cupulatus
Encyclopedia
Myosurus cupulatus is a species of flowering plant in the buttercup family
Ranunculaceae
Ranunculaceae are a family of about 1700 species of flowering plants in about 60 genera, distributed worldwide....

 known by the common name Arizona mousetail. It is native to the southwestern United States and northern Mexico, where it grows in moist and dry habitat types in desert, scrub, and woodland. It is an annual plant forming a small tuft up to about 14 centimeters tall. The leaves are linear to lance-shaped and up to 7 centimeters in length. The inflorescence
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...

 produces a single flower which has an elongated, cylindrical or cone-shaped receptacle up to 4 centimeters long. At the base of the receptacle are curving, spurred sepal
Sepal
A sepal is a part of the flower of angiosperms . Collectively the sepals form the calyx, which is the outermost whorl of parts that form a flower. Usually green, sepals have the typical function of protecting the petals when the flower is in bud...

s and five petals each under 3 millimeters long.

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