808 PATAGONIAN EXPEDITIONS: BOTANY. 



branchlets. Involucre ovate, its scales oval, subacute, as long as the 

 pappus. Lower leaves 5 cm. by 1 2 mm. ; the broader leaves are 3-nerved, 

 the narrower i -nerved. 



(S. Brazil) ; N. Patagon., by Rio Negro. 



22. BACCHARIS ROSMARINIFOLIA Hook. & Arn. 



Branching shrub, densely leafy. Leaves linear, rather obtuse, thick- 

 coriaceous, entire, margin revolute, with the branchlets resinous-glandular. 

 Corymbs terminal, densely few-headed. Involucre oval, its scales elliptic- 

 oblong, the outer ones obtuse, the inner subacute. Achenes glabrous. 



(Chili) ; N. Patagon., by Lago Nahuel-huapi. 



23. B. RUFESCENS Spreng. (B. baldwini Hook. & Arn.) 



Heads subsessile, glomerate, spicate, leafy, terminating the branches. 

 Leaves cuneate-linear, 3-i-toothed above the middle, rarely entire, 12- 

 25 mm. long, 2-4 mm. broad. Heads androgynous, ovate-oblong; 

 females subcylindric ; in both sexes 6 mm. long ; (allied to B. paucidentata 

 DC, hemispheric and smaller). 



(Brazil; Argent); Patagon., by Rio Negro. 



24. B. SAGITTALIS DC. (LeSS.). 



Fruticulose ; ^-winged, the wings plane, remotely interrupted. Leaves 

 linear-lanceolate, acute, 14-18 mm. long, shorter than the internodes. 

 Heads in a continuous or interrupted, terminal spike. Involucre cam- 

 panulate-ovate, its scales obtuse in the male, in the female acute, the 

 innermost acuminate. Achenes glabrous. 



(Chili) ; W. Patagon. ; Chubut, by Teka-choique. 



25. B. SALICIFOLIA Pers. 



Shrub, over 2 meters tall, with spongy wood. Branches not winged. 

 Leaves lanceolate-linear, serrate, 3-nerved, resinous. Corymbs terminal. 



N. Patagon., by Rio Negro to Rio Chubut, and in valley of Rio Col- 

 orado ; widely spread over temperate S. Amer. The wood is used by 

 the Indians to strike fire by friction. 



