TILIACEAE 89 
MALVALES. 
Flowers with petals. 
Trees, stamens not united into a tube around the style. 1. Tiliaceae. 
Herbs, stamen filaments forming a tube around the style. 
2. Malvaceae. 
Flowers apetalous. 
Trees, 
Sap not milky, fruits separate. 3. Ulmaceae. 
Sap milky, fruits aggregated. 4. Moraceae. 
Herbs or vines. 
Leaves lobed or divided. 4. Moraceae. 
Leaves serrate, not lobed or divided. 5. Urticaceae. 
1. TILIACEAE. 
Tilia. 616, 
1. Tilia americana L. American Linden. 
Mostly along streams in the eastern part of the state. Cuba; Long 
Pine; Omaha; Ponca; Richardson County; Royal; Valentine; Weeping 
Water; Wymore. 
2. MALVACEAE, 
Carpels 1 ovuled. 
Flowers mostly over 8 mm. broad, never yellow. 
Glabrous or pubescent with simple hairs. 
Carpels beakless petals obcordate. 1. Malva. 
Carpels beaked, petals truncate. 2. Callirrhoe. 
Pubescent with stellate hairs. 3. Malvastrum. 
Flowers small, 4-8 mm. broad, yellow. 4. Sida. 
Carpels 2-many ovuled. 
Involucel none. 5. Abutilon. 
Involucei of numerous narrow bracts. 6. Hibiscus. 
1. Malva. 618, 
Erect or ascending, flowers over 15 mm, broad, carpels about 10. 
1. M. sylvestris. 
Procumbent, flowers less than 15 mm. broad, carpels about 15. 
2. M. rotundifolia. 
1. Malva sylvestris L. High Mallow. 
Rare in waste places. Beaver City; Red Cloud. 
2, Malva rotundifolia L, Running Mallow. 
Introduced in various localities throughout the state. Callaway; 
Bazile Mills; Kearney; Lincoln; Minden, 
2. Callirrhoe. 619. 
Involucel wanting, flowers pink or white, 2-3 cm. broad. 
1. C. alceoides. 
Involucel of three bracts, flowers reddish purple, 2-6 cm. broad. 
2. C. involucrata. 
