140 HALOKAGIDACEAE 



1. H. speciosa (Nutt.) Small. WHITE EVENING PRIMROSE. 6'- 24' 

 high, puberulent : leaves lanceolate, sinuate-denticulate : flowers 1A-3' 

 broad, rose- colored to white, showy. Abundant in barrens throughout 

 the southern part. May-June. 



6. MERIOLIX Raf. 



Flowers axillary, the parts in fours. Stamens equal. Calyx tubes 

 short. Capsules linear-cylindric. 



1. M. serrulata (Nutt.) Walp. YELLOW EVENING PRIMROSE. 8'- 

 15' high, canescent : leaves linear-lanceolate, denticulate : flowers 6"- 

 18" broad. Rarely adventized near Sheffield. May-June. 



7. GAURA L. 



Flowers spicate-racemose. Parts of the flower in fours. Petals clawed. 

 Filaments 8, each with a scale at base. Fruit indehiscent, ribbed, 

 1-celled, 1-4-seeded. 



Plants 3-5 high. 



Stems long-hirsute. 1. G. parviflora. 



Stems appressed-pubescent. 2. G. bienms. 



Plants l-2 high. 3. G. coccinea. 



1. G. parviflora Dougl. Stems 3-5 high, long-pubescent : leaves 

 ovate-lanceolate, repand-dentioulate : flowers 2" broad : fruit 4-angled, 

 glabrous. Rather common in dry soil, especially around Kansas City. 

 May-August. 



2. G. biennis L. 3-5 high, appressed-pubescent : leaves oblong- 

 lanceolate, denticulate : flowers 4 // -5 // broad, light pink : fruit 4-ribbed, 

 pubescent. Not uncommon in dry soil throughout. July-September. 



3. G. coccinea Pursh. l-2 high, canescent : leaves lanceolate-ob- 

 long, repand-denticulate : flowers 4 // -5 // broad, reddish-pink : fruit 

 4-sided above, canescent. Rarely adventized near Sheffield and Ather- 

 ton. May- July. 



8. CIRCABA L. 



Perennial with racemose whitish flowers, and opposite long-petioled 

 leaves. Fruit 1-2-celled, 1-2-seeded, densely bristly with hooked hairs. 



1. C. Lutetiana L. ENCHANTER'S NIGHTSHADE. l-2 high : leaves 

 ovate, toothed : flowers \\" broad. Abundant in rich woods throughout. 

 June-August. 



FAMILY 91. HALORAGIDACEAE Kl. & Garcke. 

 Aquatic herbs with small sessile axillary flowers. Calyx tube coherent 

 with the ovary. Petals 0-4. Stamens 1-8. Ovary 1-4 -celled, each cell 

 containing a single ovule. 



1. MYRIOPHYLLUM L. 



Flowers monoecious or polygamous, the parts in fours. Leaves whorled, 

 the submersed pinnately divided, the emersed variously cut. 



