Lysimachia 



PRIMULACEAE 



749 



o ~"5o 

 Map 1599 



Lysimachia lanceolata Walt. 



50 



Map 1600 



Lysimachia hybrida Michx 



o 50 



Map 1601 



Lysimachia longifolia Pursh 



6. Lysimachia lanceolata Walt. (Steironema heterophyllum Michx. 

 and Steironema lanceolatum (Walt.) Gray.) (Fernald. The identity of Lysi- 

 machia lanceolata. Rhodora 39: 438-442. 1937.) Map 1599. Rather 

 frequent in small colonies in dry soil on the crests and slopes of black and 

 white oak ridges, in dry prairies, and rarely in moist soil and then usually 

 in a slightly acid soil and usually associated with black chokeberry or 

 sweet gum. In the woods it is most commonly associated with black and 

 white oak. Small plants usually have their leaf blades more or less folded 

 inward. 



The fact that this species is difficult to separate from the next one led 

 me to place it under cultivation. I have found it very responsive to light 

 and moisture. I think these two factors and temperature greatly change 

 the appearance of the mature plants. The plants send up one or two sets 

 of basal leaves late in autumn or early winter. These leaves are usually 

 short and obtuse and have long petioles. In mild winters when the crown 

 of the plant is protected these basal leaves persist, sometimes until matur- 

 ity. In some plants these early leaves are killed and no leaves will be seen 

 from the first few short internodes. Crowding, too, has much the same 

 effect in killing off the early leaves. The length of the internodes is easily 

 accounted for when the habitat and moisture are known. The next species 

 usually grows in very wet places, usually inundated more or less until late 

 spring. Many plants begin their growth under water and the submerged 

 leaves die off and are later replaced by stipular leaves that are smaller and 

 usually much narrower. In 1937 it was very wet and one bed of my plants 

 set their principal cauline leaves at the third node, but usually these leaves 

 begin about the fifth node. 



Pa., Ohio, s. Mich., southw. to Fla. and Tex. 



7. Lysimachia hybrida Michx. Map 1600. Infrequent to rare in the 



bottoms of ditches, in ponds and swamps, and on the muddy borders of 

 sloughs and streams. 



Que. to w. Ont. and N. Dak., southw. to Fla. and Tex. 



