8OO PATAGONIAN EXPEDITIONS I BOTANY. 



CHRYSOCOMA CUNEIFOLIA Jacq. 



Glabrous shrub. Leaves shortly petiolate, cuneiform, few-serrate 

 towards the apex, about 4 cm. long. Pedtmcles terminal, very short, 

 sometimes solitary, sometimes crowded, all with leaves enclosing the sub- 

 sessile flowers. Receptacle naked. Pappus pilose, equalling the corolla. 

 Magellan. 



20. HETEROTHALAMUS Less. 



Glabrous or glutinous shrubs, with alternate, entire or toothed, or 

 no leaves ; and small, polygamo-dicecious heads. Heads in one plant 

 hermaphrodite and discoid, but sterile, or with fertile ray-flowers; in 

 another plant discoid and all fertile. Anthers basi-obtuse. Style-branches 

 of the perfect flowers narrow, ciliate, or cohering. Papptis-setce often 

 clavate. Achenes glabrous. 



Species 5, S. Amer. 



1. H. NIVALIS (Sch. Bip.) Wedd. 



Cespitose or suffruticose, branching much, dioecious. Leaves linear, 

 i cm. long, plane, attenuate downwards. Floriferous branches first bend- 

 ing, then ascending a few cm., with heads solitary on terminal peduncles. 

 Pappus-bristles very tortuous. 



(Chili, near the snow) ; W. Fuegia, by Rio Condor. (Dusen.) 



2. H. SPARTIOIDES Hook. & Arn. 



Leafless and dioecious, resembling B ace harts aphylla DC. (Eng. & 

 Prantl, iv, 5, p. 171, A). Much branching, with minute, scale-like, acute, 

 remote leaves. Heads in racemes or corymbs. 



Patagon., by Rio Negro; Rio Chubut; Rio Chico de la Sta. Cruz. 



3. H. TENELLUS (Hook. & Arn. sub Baccharis] O. Ktze. 



All pubescent-hoary, suffruticose. Branches angulate. Leaves alter- 

 nate, remote, linear-subulate, entire, acute, slightly rigid, i -nerved. 

 Heads terminal, solitary, rather large. Involucre broad-campanulate ; its 

 scales ovate, acute, imbricate, apically naked and colored. 



N. Patagon., near Carmen ; S. Patagon., by Rio Sta. Cruz. 



H. TENELLUS GRACILIOR. 



Bahia Blanca to N. Patagon. 



