262 FLORA OF TEXAS. 



petals as many as tlie teeth of the calyx and inserted into 

 its throat, deciduous, sometimes wanting ; stamens as many 

 as the petals,- or 2-4 times as many, inserted below the 

 petals; anthers short, intorse; style solitary; capsule 

 enclosed in^the calyx, 1-4-celled, few or many seeded; 

 placentcB central ; seeds anatropous, without albumen ; 

 sinuses of the calyx often appendaged ; stigina capitate, or 

 rarely 2-lobed. 



SYNOPSIS. 



* Caiyx regular. 



Calyx hemispherical. Petals none, etigma 2-lobed. Capsule 2-celled. 



Htpobrtchia. 



campanulate. Stigma capitate. Capsule 4-celled Ammanxia. 



cylindrical, striate. Capsule oblong, 2-celled Lythuum. 



short, even. Capsule globose, 3-5-celled. Stamens 10 Nes^ea. 



** Calyx gibbous at tJie base. 

 Calyx tubular, 12-ribbed. Stamens mostly 12. Capsule early ruptured.. Cupoe a. 



HYPOBEYCHIA. 



Calyx hemispherical or campanulate, 4-lobed; petals 

 none; stamens 2-4; style very short; stigma 2-lobed; 

 capsule globose, 2-celled. — A submerged aquatic lierl, with 

 long filiform stems, opposite crowded pellucid linear leaves, 

 and minute sessile axillary ^o?f;er5. 



H. JSTuTTALLii, Torr, and Gray. Stems l°-2° long; 

 leaves V long, acute; flowers noi larger than a pin's head. 

 Ponds and still waters. 



AMMANNIA. Houston. 



Calyx globular or campanulate, 4-angled, 4-toothed, the 

 sinuses commonly furnished with a small horn-shaped 

 appendage; jjetals 4, small, deciduous, sometimes want- 

 ing ; stamens 4, short ; stigma capitate ; capsule globular, 

 4-celled, many-seeded. — Low annual smooth herhs, witli 

 opposite leaves, and solitary or clw^tQvedi floioers. 



