MACLOSKIE: COMPOSITE. 901 



the outer ovate-lanceolate, acuminate; the inner broad-white, scarious. 

 Ac hems strongly ribbed, costae spinulose at apex. Rostrum as long as 

 the achene. 



Magellan, at Rio Blanco. 



2. TARAXACUM MAGELLANICUM Comm. 



Petioles slender, elongated. Leaves rounded apically. Involucral 

 scales all erect, the outer white-red, scariously margined. 

 (Argentine pampas) ; Magellan, by Punta Arenas. 



3. T. TARAXACUM (L. sub Leontodon] Karst. ( T. officinale Web. ; T. 



dens-leonis Desf.) Dandelion. 



Root thick, deep. Leaves in outline oblong to spatulate, pubescent 

 when young, irregularly pinnatifid or sinuate-toothed, rather succulent, 

 narrowed to the petiole. Scape erect. Head solitary, 25-50 mm. broad ; 

 flowers golden. Outer involucre reflexed. Achenes muricate at top, 

 narrowing to the long, filiform rostrum. 



(Eurasia and N. Amer.) Patagon., Magellan (Dusen) ; Fuegia; Falk- 

 lands (introduced). 



4. T. TARAXACUM L/EViGATUM (W. sub Leontodon] O. Ktze. 



Glabrous. Leaves runcinate-pinnatipartite, lobes unequal, lanceolate, 

 acuminate, subdentate. Involucral scales subcorniculate, callous-tipped, 

 the outer spreading. Achenes pale, with rostrum longer than in the type. 



(Eurasia, in meadows and dry pastures) ; Patagon. ; Magellan ; Fuegia, 

 passim, alpine about Ushuaia ; Falklands. 



5. T. TARAXACUM ALPiNUM (Koch.) Porter. 



Outer invohicral scales spreading, ovate or narrower. Leaves very 

 deeply parted. Achenes pale brown. 



(Europe; Labrador ; and by Rockies and Calif, southwards.) S. Pata- 

 gon., by Hatcher at Coy Inlet and Punta Arenas. 



82. SONCHUS Linn. 



Succulent herbs, with milky juice and alternate, mostly auriculate, am- 

 plexicaul leaves, entire or toothed, or lobed, and prickly-margined. 

 Heads large or midsize, corymbose, yellow. Involucre ovoid to cam- 



