778 PATAGONIAN EXPEDITIONS I BOTANY. 



(N. Amer. and W. I.) ; N. Patagon., along Rio Negro ("a form with del- 

 toid and obtusely toothed leaves, pubescent above, scabrid below." Speg.). 



5. GRINDELIA Willd. 



Perennial herbs or undershrubs, with alternate, sessile or amplexicaul 

 leaves, usually spinulose-dentate and glutinous above ; and large, heter- 

 ogamous, radiate heads of yellow flowers terminating the branches. An- 

 thers basi-obtuse. Style-branches flat, appendaged. Pappus of 2-8 awns 

 or bristles, deciduous. Disk-flowers hermaphrodite or male ; ray-flowers 

 female, sometimes obsolete, the heads being then discoid and homogamous. 



Species 25; some in W. N. Amer., as "gum-plants"; many in South 

 Brazil, Chili, etc. 



I. G. BRACHYSTEPHANA Griseb. 



Suffruticose, multicauline, all puberulous, the branches i -headed. Leaves 

 sessile, lanceolate-acuminate, remotely spinulose serrate (or entire), basi- 

 attenuate, spinescent-tipped. Involucre hemispherical, its scales appressed, 

 scarious, ovate or ovate-lanceolate, with a linear-acuminate, squarrose, leafy 

 appendage. Ray half as long again as the involucre. Pappus of 2-3 

 setas. 



N. Patagon.; Chubut; S. Patagon., by Rio Chico. 



2. G. BRACHYSTEPHANA BERGI Hier. 



Climbing. Lower leaves narrowed to a petiole as long as the lamina. 

 Pinnae pinnatifid, spinulose-serrate ; upper semiamplexicaul, linear-lanceo- 

 late or subcuneate, spinulose-serrate ; uppermost entire. Varying greatly. 



N. Patagon., by Rio Negro. 



3. G. DIFFUSA D. Don (non Hook & Arn.). 



Stem with woody base, diffuse, the branches terete, glabrous. Leaves 

 sessile, subamplexicaul, oblong, deeply serrate, with awned points, gla- 

 brous. Heads solitary, terminal on the branches, briefly exsert above the 

 upper leaves. Involucre-scales lance-linear, appressed. Pappus-setce few, 

 caducous. 



N. Patagon. ; S. Patagon., at Puerto Deseado. 



