164 FLORA OF TEXAS. 



ma beakless. Low ground. Flowers blue, often variegated 

 -with Avhite. 



** Flowers while. 



Y. PRiMULuEFOLiA, L. Smooth or hairy ; leaves oblong, 

 mostly acute, crenate, cordate or abruptly decurrent on 

 the winged petiole; 2yetals often acute, the lower ones 

 bearded and striped with purple. Low grounds. Jihizoma 

 slender and commonly bearing long leafy runners. Floiu- 

 ers small. 



16. CISTUS FAMILY. Order, Cistace^. 



Herhs or low shrubs with opposite, entire, simple leaves. 

 Floivers perfect, hypogynous, on 1-sided racemes. Petals 

 5 or 3, all alike, overlapping each other in the bud, each 

 with one edge covering the one before it, but covered by 

 that behind it. Calyx remaining after blossoming, of 5 

 sepals, three of them larger and two smaller, often very 

 small, the latter entirely outside in the bud and looking 

 like bracts. Stamens from 3 to 20 or more, all separate 

 and borne on the receptacle. Pistil 1, making a 1-celled 

 capsule, with the seeds borne on 3 parietal placentae, which 

 divide the capsule into three valves. 



SYNOPSIS. 



Heliantkemum. Style none. Stigma capitate. Embryo nearly annular. 

 Lechea. Style none, stigma plumose. Embryo straight. 

 Hudsonia. Style filiform. Stigma minute. Embryo coiled. 



HELIANTHEMUM. Kock Rose. 



Petals 5, corrugated in the bud, sometimes wanting. 

 Stigma sessile or nearly so, capitate,- 3-lobed. Capsule 

 3-valved. Emhryo curved nearly into a ring. Low herbs 

 or partly shrubby plants, with fugacious yellow flowers. 



* Flowers perfect ; petals conspicuous ; stamens indefinite ; capsule mamj-seeded. 



