XXVII. TYPHACE^]. 



825 



& ^W 



^._ v--\ 



Sparganium. 

 Ovary cut verti- 

 cally (mag.). 



Sparganium. Ovarian cell 



opened, showing the seed with 



its outer raphe (mag.). 



S. natans. 

 Fruit cut, with the 

 four scales (mag.). 



S. natans, 

 Seed 

 (mag.). 



S. natani. 

 Embryo 

 (mag.). 





FLOWERS monoecious, in a spike or heads, seated on a spadix. PERIANTH 0. 

 STAMENS accompanied by bristles or scales. OVARIES l-2-celled, \-ovuled; OVULE 

 pendulous, anatropous. FRUIT dry or fleshy. SEED albuminous. EMBRYO axile; or 

 RADICLE superior. STEM herbaceous. LEAVES alternate. 



Aquatic or marsh HERBS, perennial, with creeping rhizome. STEMS cylindric, 

 not knotty, solid, simple or branched. LEAVES alternate, linear, striate, entire, 

 gathered at the base of the stem, sheathing ; the cauline subtending the spadices, 

 or forming an involucre before flowering. FLOWERS imperfect, seated on a monoe- 

 cious spadix, in heads (Sparganium), or dense spikes, sometimes continuous and 

 furnished at intervals with foliaceous very caducous spathes, sometimes interrupted 

 (Typha)', the upper flowers staminiferous, the lower pistilliferous. FLOWERS $: 

 PERIANTH 0. STAMENS numerous, accompanied by bristles or membranous scales ; 

 anthers basifixed, oblong ; cells 2, often shorter than the connective (Typha}, opening 

 longitudinally. FLOWERS ? : PERIANTH 0. OVARIES accompanied by bristles or 

 scales, sessile (Sparganium}, or on long stalks when ripe (Typha), with 1-2 1-ovuled 

 cells ; style continuous with the ovary, simple ; stigma unilateral, papillose, lingui- 

 form, elongated ; ovule pendulous from the top of the cell, anatropous. FRUITS sub- 

 drupaceous or dry, angular, tipped by the style; epicarp membranous or sub- spongy ; 

 endocarp sub-woody, indehiscent (Sparganium), or split on one side when ripe, and 

 endocarp coriaceous (Typha). SEED inverted s ; albumen farinaceous or fleshy, copious. 

 EMBRYO straight, axile ; radicle superior. 





TRIBE I. SPARGAN1EJE. 



Flowers agglomerated on a hemispheric receptacle in capitula with foliaceous 

 bracts. Spadix branched or simple. Stamens accompanied by membranous scales ; 

 ovaries l-2-celled, each with 3-4 imbricate and persistent scales. Fruit an 

 indehiscent drupe, l-2-celled, epicarp spongy. Seed ovoid, testa smooth, raphe 



external. 



ONLY GENUS. 



Sparganium. 



