826 PATAGONIAN EXPEDITIONS: BOTANY. 



44. ACTINELLA Pers. 



Chiefly herbs, with alternate or radical leaves, entire or pinnately few- 

 lobed. Heads terminating the branches, mostly radiate, heterogamous, 

 yellow-rayed, resinous. Involucre broad, its scales 2-3-seriate, subequal, 

 rigid. Receptacle convex, naked. Anthers entire or basisagittate. Style- 

 branches dilated-truncate, pencilled. Achenes silky. Pappus of 5-12 

 awned, hyaline pales. 



Species 17, N. Amer. 



1. A. ANTHEMOIDES (Cass. sub Hymenoxys] Gray. (Actinea anthe- 



modes O. Ktze.) 



Heads discoid, homogamous. Invohicral scales obovate-subspatulate. 

 Not well known ; referred by DC. and A. Gray to Hymenoxys, a sub- 

 genus, having double involucre, the outer short and connate. (Fig. in 

 Eng. & Prantl, iv, 5, p. 256, R.) ("Achenial hairs bicuspidate," Speg. 

 This character is common in many genera. See A. Gray's Revision of 

 Composite on genus Townsendia.} 



N. Patagon., along Rio Negro. 



2. A. HETEROPHYLLA (Juss. sub Actinea Cephalophora L.) H. & A. 



A. HETEROPHYLLA LATIFOLIA O. KtZC. 



Leaves narrowly lanceolate, the upper broader, 4 mm., entire. 

 Patagon. 



45. GAILLARDIA Foug. 



Pubescent herbs, with alternate or basal leaves, and large, peduncled, 

 radiate heads, the rays cuneate, variously colored, or wanting. Involucre 

 broad, 2-3-seriate, herbaceous-tipped. Receptacle convex or globose, 

 often bristly. Teeth of disk-flowers with jointed hairs. Anthers basi- 

 sagittate. Style-branches appendaged. Achenes turbinate, 5-costate, vil- 

 lous. Pappus-scales 6-12, awned, i -nerved, exceeding the achene. 



Species 12, chiefly in Central and N. Amer. 



i. G. DONIANA Gris. (Cephalophora doniana H. & A.) 

 Hoary, suffruticose. Leaves linear, entire, acute. Invohicral scales 

 appressed. Heads radiate ; ray-corollas 3-lobed, of same color with the 

 disk. Pappus-pales 6-8, rather short. Achene yellow-silky. 

 Argentina. 



