864 PATAGONIAN EXPEDITIONS! BOTANY. 



ceous ; its scales ciliate-villous ; the outer reflexed-spinescent. These and 

 the receptacle scarcely puberulous. 



S. Patagon., by Rio Gallegos, and Rio Sta. Cruz. 



2. CHUQUIRAGA AVELLANID^E Lor. 



Woody ; ramified from the base, with terete, sulcate stem and flexuose 

 branches. Leaves sessile, broad-ovate, pungent-mucronate, generally 

 concave, entire, mostly alternate, 17 by 9 mm.; spines paired in the 

 axils, 3 mm. long, rather stout. Heads solitary, sessile in the axils, to 

 2 cm. long, cylindrical. Involucral scales many-seriate, the outer herba- 

 ceous, acuminate, the inner longer and narrower, the innermost long- 

 linear, yellow above like an outer corolla, exceeding the flowers. Recep- 

 tacle concave with white hairs. Flowers in the head not many. Achenes 

 silky. Pappus-setce i -seriate, plumose, yellowish. 



N. Patagon., by Rio Colorado, etc.; Chubut; S. Patagon., by Rio Chico. 

 " Distinguished from C. spinosa by much larger leaves, broader and alter- 

 nate; by much shorter, thick, brown spines; and involucral scales more 

 numerous, with longer heads." 



3. C. DUSENII O. Hoffmann. 



Shrub, with erect branches, 16 cm., tomentose, with brown cortex when 

 FIG 104 young. Leaves coriaceous, subconcave, lanceolate 



from a broad base, sessile, prolonged to a brown spine, 

 entire, appressed-silky, at length glabrate, 3-nerved, 

 the midnerve prominent; their margin thickened. 

 Pairs of short axillary spines. Heads short, solitary 

 on ends of branches, and sessile amid the shorter leaves. 



Chuguiraga duscnii. , , ...... , .... 



Flower-head and invo- Involucre cylindrical; its scales many-senate, imbn- 

 lucrai scales, natural size, cate, puberulous when young, the innermost exceed- 

 (AfterO. Hoffmann.) j n g ^g. flowers, and with stellately recurved tips, the 

 recurved part petaloid, linear, acute. Achenes silky. (Fig. 104.) 



N. Patagon., by Puerto Madryn (Dusen). " Near C. avellanidce but 

 distinguished by having longer leaves with thickened margins." 



4. C. ERINACEA D. Don. 



Branches and leaves pubescent. Leaves subulate, concave above, 

 spinescent tipped, without other spines. Heads 6-flowered. 

 (Fig. in Eng. & Prantl, iv, 5, p. 335, J.) 



