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. 4. Guttiferae, 
Sepals 3 or 5; when 5 the 2 outer much smaller, eurls single or none. 
2. Cistaceae. 
Lower petal spurred; stamens 5, two spinel: 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 hypericoides L. 
Nebraska according to Gray’s Manual. 
a 2. Hypericum. 625, 
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. ‘sh 
3. H. mutilum. 
Flowers 6-10 mm. broad, capsule 8-10 mm. long.) 4, H. majus. 
Leaves linear 2-4 mm. wide. 5. H. canadense. 
