206 PBACTICAL BOTANY. 



Spikes 1-flowered, glomerate iu a sessile head. 

 Stamens 1-3. Kyllingia pumila, Mx. 



Gr. T. I. 



555. Each glume flower-hearing, or sometimes the lowest 

 empty. Inflorescence exclusively either terminal -or axillary. 

 Flowers all perfect 5S6 



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 559 



II. 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, ^pikelets mostly in umbels, at 

 length clothed with long, silky hairs. Eriophorum. 



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-clcft (3-cleft 



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



head or umbel. Pimbristylis, Gray 



(including Trichelostylis, Listib.) 



Gr. T. III. J f I 



