804 PATAGONIAN EXPEDITIONS: BOTANY. 



7. BACCHARIS DENTICULATA DC. 



Glabrous, branching shrub, with subangulate branches. Leaves linear, 

 7 by 2 mm., basiattenuate, acutely and coarsely 2-3-toothed at apex, 

 coriaceous. Heads crowded at ends of the branches, oblong, glabrous. 

 Involucral scales acuminate. Pappus slightly exceeding the involucre. 

 Achenes glabrous. 



(Argentina) ; N. Patagon. 



8. B. DUSENII O. Hoffmann. 



Low, branching undershrub, 7 cm. high. Branches with leaf-scars 

 below, leafy above. Leaves sessile, oblong, 10 by 3 

 mm., 3-nerved, the lateral nerves faint, sinuate-dentate, 

 the teeth ending in white setae. Male heads small, soli- 

 tary on ends of the branches, short-pediceled. Involucre- 

 scales 3-seriate, i -nerved, their margin hyaline, fimbril- 

 late. Female heads? (Fig- 99-) 



S. Patagon., by Puerto Madryn. (Dusen.) 



Baccharis dusenii. 



Branch with flower- R FLABELLATA H Ook. & Am. 



head; also (magnified) 



leaf and invoiucrai Fruticose, erect, glabrous ; branches angulate, the 

 scale. (After o. Hoff- younger viscid. Leaves fan-shaped, coriaceous, coarsely 



angulate-toothed, obscurely 3-nerved, obsoletely pitted, 

 attenuate-petiolate. Heads sessile, axillary, crowded ; involucre ovoid, its 

 scales ovate, i -nerved, the inner longer. 



(Brazil, Prov. of St. Louis) ; N. Patagon., by confluence of Rio Limay 

 and Rio Neuquen. 



10. B. GENISTELLOIDES (Pers.) Lam. 



Undershrubs, 3-winged. Wings plane, nerveless, short or often inter- 

 rupted. Leaves very small, reduced to subternate, acutish scales. Heads 

 few (1-2), interruptedly spicate. Involucre turbinate, its scales all acumi- 

 nate. Rachis naked. Achenes glabrous, cylindraceous, sulcate. 



(Peru.) 



P. GENISTELLOIDES CYLINDRICA (DC.) Bkr. 



Herbaceous, 3-winged. Leaflets reduced to mere scales. Heads 

 spicate-glomerate ; the male involucre campanulate; the female oblong- 

 cylindrical ; the scales acute. Achenes glabrous. 



(Brazil; Argentina); N. Patagon., high plains along Rio Negro. 



