760 PATAGONIAN EXPEDITIONS: BOTANY. 



apical flower-head, and some additional, pediceled, axillary heads. Invo- 

 lucre 5-8-cleft, with long segments. Achenes sharply pentagonal, white, 

 smooth, crowned by the calyx-lobes. 



S. Patagon., swampy sands by Rio Chico; along Golfo de San Jorge. 

 Stamens inserted in the throat of the corolla-tube. 



II. BOOPIS MULTICAULIS Phil. 



Glabrous. Stems 30 cm. high, several from the root, erect, subnude, 

 i-3-headed. Radical leaves 9 cm. long, deeply pinnatifid, nearly pinnate ; 

 petioles naked to their middle. Lobes 4-5 pairs, oblong, obtuse, pin- 

 natifid-toothed. Cauline leaves in 2's or 3's, subsessile, pinnatifid, their 

 segments at length entire. Peduncles 7 cm. long, naked. Involucral 

 scales entire, attenuate, or i or 2 of them spatulate, 3-toothed. Pales 

 lanceolate to setaceous. Corolla long, with white limb. 



(Andes) ; Chubut, in rocks by Carren-leofu. 



B. MULTICAULIS PATAGONICA O. Ktze. 



Stems short, 5 cm. long. Involucral lobes mostly leafy-toothed. 

 Patagon. 



12. B. PATAGONICA Speg. (B. alpina Speg. non Poepp.) 

 Low, stemless, glabrous perennial, green-glaucous. Leaves oblanceo- 

 late, or obovate, fleshy, long-attenuate-petiolate. Heads subsessile, turbi- 

 nate. Involucre i -leaved, 5-8-toothed, or lobed, the lobes often obtuse and 

 very large. Pales none. Flowers numerous; corollas white, 5-toothed 

 cylindraceous. Stamens inserted near the base of the tube. Style fili- 

 form, long-exserted. Ovary 5-costate, glabrous. 



S. Patagon. ; in dry places near Chonkenk Aike by Rio Chico ; and 

 between San Julian and Rio Deseado. 



13. B. RIGIDULA Miers. 



Stems simple, erect, angulate-striate, flexuose. Leaves pinnatisect, 

 segments and rachis narrow-linear, 4-5 pairs and a terminal one, divari- 

 cate-mucronate, rigid, coriaceous, revolute. Head solitary, terminal, 

 long-peduncled. Involucre connate, broad, lo-cleft nearly to middle., 

 Segments narrow, 3-nerved, aciculate. Flowers equal. Calyx-lobes ob- 

 scurely 3-toothed at apex. 



(Chili, Argentina) ; Patagon. 



