428 FLORA OF TEXAS. 



August. Stem l°-3° long; leaves 3'-4'long. In ponds 

 and ditches around Houston. 



91. POLEMONIUM FAMILY. Order, Polemoxiace^. 



Chiefly herbs, with opposite or alternate leaves, and regu- 

 lar solitary or cymose/?oz6'ers ; cali/x 5-cleft or 5-parteil, 

 with membranaceous-margined lobes, imbricated in the 

 bud ; corolla 5-lobed, convolute or imbricated in the bud ; 

 stamens 5, inserted on the tube of the corolla ; ovai'y 

 3-celled, with 3-many amphitropous ovules attached to the 

 central placentae ; style 3-cleft ; capsule 3-celled, loculicid- 

 ally 3-valved ; seeds angular ; embryo straight in the axis 

 of copious albumen ; cotyledons leafy ; radicle inferior. 



SYNOPSIS. 



Tribe I. Polemoniese. Lcbes of the corolla convo- 

 lute in the bud. Anther-cells ^iiVdiWel, opening lengthwise. 



Cai'olla salver-foi'm. Filaments vnequaUy inserted on the tube. Leaves entire. 



Phlox. 

 tubular-funnd-form. Filaments equally inserted near the throat of the 



coi'dla. Leaves pinnately divided Gilia. 



short-bell form. Filaments inserted on the throat of the corolla. Leaves 



2nnnjte Pouemonium. 



Tribe II. Diapensieae. Lobes of the corolla imbri- 

 cated in the bud. Anther-cells opening transversely. 



Anther-cells awned at the base. Leaves entire. Flowers solitary . .TYsrDMsrrBSELA. 



PHLOX, L. 



Calyx cylindrical or bell-shaped, 5-cleft ; corolla salver- 

 form, with a long and slender tube, and obovate or round- 

 ish lobes ; stamens 5, included, unequally inserted on the 

 tube; s/'?//e filiform ; ovules solitary in the cells; capsule 

 ovoid, 1-3-seeded, the valves at length separating from the 

 central placenta ; seeds erect. — Mostly perennial herbs, with 



