ASTERACEAE: HELIANTHEAE 179 
2. Antennaria. 973. 
Heads several, capitate; plants 5 cm. or more high. 
Basal leaves 1-nerved or indistinctly 3-nerved. 
Bracts mostly obtuse, plant 2.5-30 cm. high. 1. A. aprica. 
Bracts mostly acute. 
Plants about 3 dm. high. 2. A. neodioica. 
Plants 0.5-1.5 dm. high. 3. A. campestris. 
Basal leaves distinctly 3-5 nerved. 4. A. plantagitrotia, 
Heads solitary, terminal, plants about 2.5 cm. high. 5. A. dimorpha. 
1. Antennaria aprica Greene. 
In dry soil in the western part of the state. Alliance; Callaway; Ft. 
Robinson; Gordon; Harrison; Long Pine; Thedford. 
2. Antennaria neodioica Greene. 
Burwell; Valentine. 
3. Antennaria campestris Rydb. 
Common on dry prairies. Burwell; Callaway; Long Pine; Lincoln; 
Nebraska City; Red Cloud. 
4. Antennaria plantaginifolia (L.) Richards. 
In dry soil in the eastern part of the state. Fairbury; Falls City; 
Lincoln; Nebraska City; Riverton; Weeping Water. 
5, Antennaria dimorpha (Nutt.) T. & G. 
In dry soil in the western part of the state. Chadron; Harrison; 
Rushville. 
3. Gnaphalium. 977. 
Tall erect, 3-9 dm. high, inflorescence corymbose. 1. G. obtusifolium. 
Low, diffuse, less than 2 dm. high, inflorescence capitate. 
2. G. palustre. 
1. Gnaphalium obtusifolium L. 
In dry soil in the southeastern part of the state. Nebraska City. 
2. Gnaphalium palustre Nutt. 
In wet places in the western part of the state. Grand Rapids. 
Tribe 5. HELIANTHEAE. 
Involucral bracts in 2 to several series, when only 2 series the inner 
and outer of similar texture. 
Ray flowers pistillate, producing seeds. 
Achenes of the ray-flowers winged, imbricated in 2-3 rows, disk- 
flowers perfect ut not producing seeds. 1. Silphium. 
Achenes not wingee, disk-flowers producing seeds. 
Rays long, yellow. 2. Heliopsis. 
Rays short, nearly white. 3. Eclipta. 
Ray flowers neutral, not producing seeds. 
Rays rose-purple to nearly white, never yellow, achenes not com- 
pressed or winged. 6. Brauneria. 
Rays yellow or if purple the achenes compressed and winged. 
Achenes neither winged nor much compressed. 
Receptacle conic or convex, pappus of very small teeth or 
none. 4. Rudbeckia. 
Receptacle flat, conic or convex, pappus of 2 large scales or 
awns, sometimes with 2-4 smaller ones, 7. Helianthus. 
