elliptic, 2.5-4 mm long; very strongly ribbed; nearly symmetrical
sub-globose-reniform(bean shaped), 1.5-2 mm; covered with hooked bristles except at attachment scar (see seed in bottom l...
flat-lenticular in cross-section, obovate in outline, 2-3.5 mm; prominently beaked and sometimes with marginal wing
nut depressed to narrowly ovate, 2-5 cm long, 2-4 cm wide; cup covering 1/3 to 3/4 of nut; marginal cup scales awned, fo...
fruit 3-5 cm long; seeds 5-10 mm in diameter
nut depressed to narrowly ovoid, 2-5 cm long, 2-4 cm wide; cup covering 1/3 to 3/4 of nut; marginal cup scales awned, fo...
nut ovoid, 6-13 mm long; cup bowl shaped, covering 1/2 of nut; large, pubescent scales; marginal scales projecting, formi...
fruit 3-5 cm long; wing may be straight or incurved; seed ~1.2 cm long
nut ovoid, 6-13 mm long; cup bowl shaped, covering 1/2 of nut; large, pubescent scales; marginal scales projecting, formi...
oval-lenticular to ovate, 1.5-3 mm long; a light colored, slender attachment stalk appressed to thinnest edge of seed; in...
oval-lenticular, 1-2 mm; black, very shiny; note marginal cleft plugged with white material
fruit linear to oblanceolate, 3-5 cm; wing extending 1/3 the length of the body
fruit linear to spatulate, 2.5-7.5 cm long; wing extending ~1/2 the length of body
lanceolate, ~8-9 x 1-1.5 x 1 mm; tuft of stiff hairs pointed upward from base (oriented as top in image); style base pers...
lenticular in cross-section, elliptic in outline, ~1.5 mm long; beak present, but very short
pointy, brown colored
elliptic-ovate in outline compressed triangular in cross section, 2-3 mm long; very slightly arched inward; crosswise wri...
rounded, kidney shaped, 0.5-1.5 mm long; dark tipped, cone shaped tubercles (warty bumps) in concentric rows, increasing ...
compressed kidney shaped, 0.5- 1 mm; rounded, irregular shaped tubercles (warty bumps) concentric from hilum (seed base)
oval-orbicular, ~1 mm long; surface is hoarfrost patterned; margins covered in large, rounded tubercles (warty bumps)
ovate, 2.5-3.5 mm long; acutely tipped; spikelet 3-4 mm long; awn 3-10 mm long, sometimes up to 25 mm long
elliptic-ovate, 2.5-3.5 mm long; awn may or may not be present; awn 2-4 cm long
elliptic-ovate, 2.5-3.5 mm long; awn may or may not be present; awn 2-4 cm long
oblong-cylindric, 2-3 mm long with tapering base; pappus (white hairs) may or may not be present in fossils; lengthwise r...
oblong, tapering to base, 2-4 mm long, 5 angled; speckled with small red dots; coarse, white pappus may or may not be pre...
