206 PRACTICAL BOTANY. 



Spikes 1-flowered, glomerate in a sessile head. 

 Stamens 1-3. Kyllingia pumila, Mx. 



Gr. T. I. 



555, Each glume flower-bearing, or sometimes the lowest 

 empty. Inflorescence exclusively either terminal or axillary. 

 Flowers all perfect 556 



Many of the lower glumes empty. Inflorescence 

 both terminal and axillary (with a single exception). Flow- 

 ers perfect or polygamous 560 



556, I. Perianth none 659 



IL Perianth of 3 large scales and mostly as many 



alternate bristles. (Fuirena), 646. 



III. Perianth of 3 to many bristles 557 



557, Achenium crowned with a tubercle. Bristles most- 

 ly 6. Spike solitary, terminal. Stems leafless. Eleocharis. 



Gr. T. III. 



Achenium not tuberculate. Stems mostly leafy, 

 rarely leafless 558 



558, Bristles 3-6, short, or else tawny. Style 2- to 3- 

 cleft. Spikes 1 to many, terminal (appearing lateral some- 

 times). Scirpus. 



Gr. T. III. 



Bristles many (rarely only 6), long, white, or wool- 

 ly. Stem generally leafy. Spikelets mostly in umbels, at 

 length clothed with long, silky hairs. Eriophomm. 



Gr. T. III. 



559, Involucre 1-leaved (usually with another minute 

 leaf). Spikes one or few in an apparent lateral cluster, 

 which is in fact terminal. Stamen 1. 



Hemicarpha subsquarrosa, Nees. 

 Gr. T. II. 



Involucre 2- to 3-leaved. Style 2- or 3-cleft (3-cleft 



in § Trichelostylis). Stamens 1-3. Spikes in a terminal 



head or umbel. Fimbristylis, Gray 



(including Trichelostylis, Listib.) 



Gr. T. III. J ^ f 



