790 PATAGONIAN EXPEDITIONS: BOTANY. 



scales lanceolate, acute, shorter than the disk. Ligules few, purplish, not 

 exceeding the disk. 



(N. Amer.) ; Patagon., by Rio Negro and Rio Chico de la Sta. Cruz. 



4. ASTER MONTEVIDENSIS Gris. (Leucopsis diffitsa Baker.) 



Stems leafy, few-headed, white-hoary. Leaves also hoary. Heads 

 heterogamous, small for the genus. Involucre obscurely pilose. 

 (Argentina; Uruguay) ; N. Patagon., by Rio Negro. 



5. A. SENEBIERIFOLIUS O. Ktze. (Aplopappus coronopifolitts DC.) 



Glabrous, ascending undershrub, with oblong-obovate, cuneate leaves, 

 attenuate-petiolate, coarsely incise-serrate, non-prominent nerves ; and 

 subsolitary, i-keaded, nearly naked peduncles. Invohtcral scales narrow- 

 linear, acuminate, subsquarrose, serrulate-subciliate. Achene rather silky- 

 villous. Pappus rufous and corolla yellow. 



Patagon. 



6.. A. VAHLII Hook. & Arn. (Erigeron ivahlii DC.) 



Glabrous herb, with simple, erect stem. Leaves obovate-lanceolate, 

 acutish, remotely serrate, narrowing below, sheathing at base. Ray- 

 flowers pluriseriate. Head rather large. Involucral scales pubescent. 

 Outer ligules broad. Pappus sordid-white. Achenes hairy. 



(S. Chili) ; S. and W. Patagon., in Valley of Rio Aysen ; Fuegia, pas- 

 sim to Cape Horn, " in steppes, rarer in forests " (Dusen) ; Falklands. 



15. ERIGERON Linn. 



Herbs, with alternate, often basal, usually not dissected, leaves, and soli- 

 tary or corymbed, heterogamous heads, with numerous, narrow rays, of 

 different color from the yellow disk, or rays sometimes obsolete and heads 

 then disciform. Involucre hemispheric or campanulate ; its scales narrow, 

 subequal, usually in i-2-series. Receptacle generally naked. Anthers 

 basiobtuse. Style-branches flat, with short, obtuse or rounded appendages. 

 Pappus-setce \- or partly 2-seriate, slender and fragile. Achenes com- 

 pressed. 



Species 150, chiefly in N. Amer.; many also in Eurasia, S. Amer. and 

 Australia ; the introduced E. canadensis in S. Africa. 



