Myosurus minimus L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Scape 3–15 cm; lvs linear or nearly so, the blade scarcely differentiated; sep yellowish-green, the blade 3(–5)-nerved, narrowly oblong, 3–5 mm, the spur 1.5–2 mm; pet about equaling the sep; spike of pistils 5–10 mm, elongating to as much as 6 cm in fr; achenes 2.5 mm long, 1 mm wide, shortly beaked; 2n=16. Moist soil; circumboreal, in Am. chiefly western, extending e. to s. Ont., Ky., and even Va. Apr.–June.