86 GUTTIFERALES 



brara; Red Cloud; Wabash. 



18. Euphorbia obtusata Pursh. 



Low prairies in the eastern part of the state. Lincoln; Red Cloud. 



19. Euphorbia missouriensis (Norton.) Small. 

 Euphorbia dictyosperma F, & M. 



In prairies in the eastern part of the state. Beatrice; Crete; Fairbury; 

 Lincoln; Red Cedar Island; St. James. 



20. Euphorbia cyparissias L. 



Sometimes escapes from cultivation. Crete; Lincoln. 



21. Euphorbia robusta (Englem.) Small. 



In the western part of the state. Ft. Robinson; Pine Ridge; Sioux 

 County. 



9. CALLITRICHACEAE. 

 Callitriche. 596. 

 1. Callitriche palustris L. 

 In shallow running water. Kennedy; Merriman; Pauline. 



GUTTIFERALES. 



None of the petals spurred, stamens usually numerous. 



Sepals 4 or 5, when 5 all nearly equal, styles 2-5. 1. Guttiferae. 



Sepals 3 or 5, when 5 the 2 outer much smaller, style single or none. 



2. Cistaceae. 

 Lower petal spurred; stamens 5, two spurred. 3. Violaceae. 



1. GUTTIFERAE. (HYPERICACEAE.) 



Petals 4, sepals 4 in unequal pairs. 1. Ascyrum. 



Petals 5, nearly equal. 

 Petals yellow, sometimes mottled. 



Leaves normal. 2. Hypericum. 



Leaves reduced to scales. 3. Sarothra. 



Petals pink or purple. 4. Triadenum. 



1. Ascyrum. 625. 



1. Ascyrum hyperidoides L. 

 Nebraska according to Gray's Manual. 



2. Hypericum. 265. 



Styles 5, capsule 5 celled. 1. H. ascyron. 



Styles 3, capsule 1-3 celled. 



Capsule 3 celled, stamens many. 

 Flowers over 15 mm. broad, leaves not over 2 cm. long. 



2. H. perforatum. 

 Flowers less than 15 mm. broad, leaves over 2 cm. long. 



H. maculatum. 

 Capsule 1 celled, stamens few, not more than 12. 

 Leaves lanceolate or ovate, over 4 mm. wide. 



Flowers not over 4 mm. wide, capsule 2-4 mm. long. 



3. H. mutllum. 



Flowers 6-10 mm. broad, capsule 8-10 mm. long. 4. H. majus. 



Leaves linear 2-4 mm. wide. 5. H. canadense. 



