MACLOSKIE: COMPOSITE. 809 



26. BACCHARIS SERRULATA Pers. 



Leaves subglabrous, ovate-lanceolate, with a broader base, 3-nerved, 

 acutely serrulate, petiolate. Corymb branching, terminal. Stem firm, 30- 

 90 cm. high. Pappus rufescent. 



(Brazil) ; Patagon. 



27. B. SUBULATA D. Don. 



Glabrous annuals, with terete, smooth or striate stem and branches 15- 

 60 cm. long. Leaves erect, subcarnose, alternate, remote, linear-subulate, 

 acute, nerveless, entire or serrate, canaliculate in time of drought. Heads 

 solitary, terminal, subcorymbose. Involucre campanulate-hemispherical, 

 its scales purple-colored, all ovate, acuminate, narrowly scarious-margined. 



(Buenos Ayres) ; N. to S. Patagon. 



Two varieties, one with entire leaves and involucral scales, the other 

 with serrate leaves and erose scales. 



(B. tenella, sub Heterotlialamus.'] 



28. B. TRIMERA DC. 



Undershrub, branches with 3 wings, which are interrupted at places. 

 Leaves reduced to mere acute scales. Heads glomerate, in interrupted 

 spikes. Achenes oblong, glabrous. Involucral scales of the male heads 

 obtuse or acute, of the female acuminate ; outer scales all acute. 



(S. Brazil.) 



B. TRIMERA VISCOSISSIMA Speg. 



Low, lax-cespitose. Branches slender, 3-costate, subalate. Leaves 

 crowded and longer upwards, obtuse, linear (5 by I mm. above). Plant 

 viscous. 



N. Patagon., by Rio Negro. 



29. B. ULICINA Hook. & Arn. 



Branching shrub, the branches erect, striate, glabrous. Leaves narrow, 

 1-1.5 mm - broad, subulate, finely mucronate, entire and often pinnatifid. 

 Heads solitary, terminal on the short, often corymbose branches. Invo- 

 lucre subcampanulate, its scales linear-subulate, with a green nerve. 



N. Patagon., common along Rio Negro; also in Bolivia, Argentina, 

 etc., "paste" and "yerba de los ovejas"; cespitose and very green, and 

 valuable for feeding sheep. 



