P.K. Latz, Fimbrislylis 
179 
88a. Fertile glumes and spikelets broadly obtuse, 
nut narrowly and deeply furrowed, furrows generally 5, 
leaves conspicuous F. pallida 
b. Fertile glumes acute to somewhat obtuse, nut furrows broad and shallow, 
generally more than 5, leafless or leaves inconspicuous 89 
89a. Fertile glumes less than 3.5 mm long F . sp. J 
b. Fertile glumes greater than 3.5 mm long 90 
90a. Mature nut with distinct pale rounded rim at base, 
the remainder usually dark brown, lowest glume broadly obtuse, 
much shorter than the fertile glumes F. acuminata 
b. Mature nut without distinct white rounded rim at base, 
usually pale, lowest glume obtuse or acute only slightly 
shorter than the fertile glume F. acicularis 
91a. Leaves ligulate (sheaths and blades separated by a distinct 
fringe of short hairs or membranous projections) 92 
b. Leave eligulate or plant leafless (irregularly spaced hairs may 
be present on upper leaf surface) 101 
92a. Glumes hairy on back at least in apical part 93 
b. Upper glumes glabrous on back (several lower glumes may have 
stiff white hairs on or near central nerve) 95 
93a. Glumes less than 2.6 mm long, 
style less than 1.5 mm long, stamens 2 F. pubisquama 
b. Glumes greater than 2.6 mm long, style greater than 
1.5 mm long, stamens usually three 94 
94a. Glumes nearly as broad as long, style about 0.4 mm wide, 
involucral bracts usually longer than the inflorescence, 
nuts shortly stipitate F . sleberiana 
b. Glumes considerably longer than broad, style about 0.25 mm wide, 
involucral bracts shorter than the inflorescence, nut distinctly stipitate F.ferruginea 
95a. Nut distinctly longitudinally striate and transversely cancellate (lattice-like) 96 
b. Nut smooth, finely reticulate or vcrrucose 98 
96a. Spikelets less than 2 mm wide, glumes less than 2 mm long F. bisumbellata 
b. Spikelets greater than 2 mm wide, glumes greater than 2 mm long 97 
97a. Perennial, style slender, longer than nut, leaves almost distichous F . dichotoma 
b. Annual, style equal or shorter than nut (including stipe), leaves spiral .... F. depauperata 
98a. Glumes greater than 2 mm long, spikelets greater than 3 mm wide 99 
b. Glumes less than 2 mm long, spikelets less than 3 mm wide 100 
99a. Glumes greater than 4 mm long, style greater than 2 mm long, 
anthers greater than 1 mm long F. tristachya 
