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24a. Nut about as wide as broad, style greater than 2.7 mm long, 
leaves equitant 4. F. carolinii 
b. Nut flattened, style less than 2.7 mm long, leaves not equitant F. pterygosperma 
25a. Glumes acute, usually greater than 3 mm long, lowest 
(empty) glume more than half as long as spikelet 26 
b. Glumes obtuse, usually less than 3 mm long, lowest glume 
less than half the length of the spikelet 27 
26a. Style 3-5 mm long, leaf sheaths disintegrating into fine 
reticulate (herring bone) fibres, glumes 1 nerved F . dictyocolea 
b. Style 1 .5-3 mm long, leaf sheaths not as above, 
glumes obscurely several nerved F. pauciflora 
27a. Stamens 3, glumes greater than 2 mm long, perennial F. simplex 
b. Stamens 1 (-2), glumes less than 2 mm long, annual F. modesta 
28a. Spikelets all, or majority, solitary 29 
b. Spikelets all, or majority, clustered (in a composite head, or heads) 71 
29a. Mature spikelets greater than 3.8 mm wide 30 
b. Mature spikelets less than 3.8 mm wide 37 
30a. Style glabrous, upper stems scabrid 31 
b. Style hairy, upper stems glabrous or clothed with fine dense hairs 33 
31a. Style less than 2.5 mm long, nut not tuberculate 
(its cells transversely lineolate), glumes less than 3.5 mm long F. clavata 
b. Style greater than 2.5 mm long, mature nut tuberculate, 
glumes greater than 3.5 mm long 32 
32a. Glume fringes long-ciliolate, spikelets generally less than 
4 per head, leaves smooth, sheaths without wide hyaline margins 6. F. dunlopii 
b. Glumes fringes shordy ciliolate or glabrous, spikelets generally 
more than 4 per head, leaves scabrid with wide hyaline margins F. neilsonii 
33a. Glume fringes ciliolate whole length, involucral bracts hairy 34 
b. Glume fringes glabrous or ciliolate on upper margins, 
involucral bracts glabrous or with ciliate margins 35 
34a. Glume with nerve continuing past lip which is usually reflexed, 
mature nut tuberculate, distinct ligule present F. corynocarpa 
b. Glume not mucronate, mature nut smooth or sparsely verruculose, 
distinct ligule absent 7. F. laxiglumis 
35a. Style greater than 3 mm long, winged above, glumes sharply acute F. insignis 
b. Style less than 3 mm long, not winged above, glumes obtuse 36 
36a. Nut clavate, style less than 1.3 mm long, glumes glabrous F. solidifolia 
