CYPERACE, 321 
forming “spikelets” that are solitary or variously arranged, 
Perianth 0 or of hypogynous bristles or scales. Stamens 1-3, 
anthers linear, basifixed, filaments flattened. Ovary 1-celled, 
superior, style with 2-3 stigmatic branches. Fruit a compressed 
or trigonous nut. Seed erect, embryo small, basal, median, en- 
closed in the floury albumen. Plants of wet or marshy situations 
universally distributed. 
Nut not enclosed in a utricle. 
Flowers 2-sexual. 
Flowering glumes distichous. 
Glumes usually many, rachilla of spike- 
let persistent. 
Stigmas 3, nut triquetrous , . IL. Cyperus. 
Stigmas 2, nut flattened. 
Nut latterally compressed i.¢,, its 
greatest width radial to the 
rachis. t : . 2 Pycreus, 
Nut dorsally pene a i.€., its 
greatest width + OR to the 
rachis. ; . 3 Juncellus. 
Glumes few, rachilla of spikelet decidu- 
ous. 
Stigmas 2, nut compressed j . 4, Kyllinga. 
Stigmas 3, nut triquetrous. 
Fertile glumes 1-3, winged . . 5. Courtoisia. 
Fertile glumes 1-12 not winged . 6. Mariscus. 
Flowering glumes spirally arranged or 
sometimes the lowest subdistichous. 
Style-base constricted or articulated 
above the nut. 
Leaves 0, hypogynous bristles almost 
always present . . 7. Heleocharis. 
Leaves usually present, ‘hypogynous 
bristles 0. 
Leaf-sheaths usually glabrous, style 
persistent or if deciduous not 
leaving a button on the nut . 8. Fimbristylia. 
Leaf-sheaths with long fine hairs, 
style glabrous deciduous leaving 
a button on the nut . : . 9. Bulbostylis. 
