892 



PATAGONIAN EXPEDITIONS: BOTANY. 



cral scales sublinear, immersed in wool, which 

 abounds at top of the thickened scape. (Fig. 

 1 06.) 



Falklands ; ornamental on grassy hills, and 

 fragrant. 



79. PEREZIA Lag. 



Acaulescent, cespitose, or caulescent, rarely 

 shrubby ; with entire or pinnatifid leaves, their 

 margins often ciliate-spinose. Heads homoga- 

 motis, mostly many-flowered, moderate-sized, 

 sometimes rather large and solitary on a leafless, 

 bracteolate, scape-like peduncle, or panicled, 

 (Chabrad) suaveo- rarely clustered on axillary branches. Involucre 

 . Flower-head, and one of the 2 -many-seriate, its scales imbricating. Flowers 



flowers. (From Flora antarctica.') 



pink to purple, white or blue (not yellow), the 



outer lip longer both in the head and in the homochromous ray. Style- 

 branches truncate, with terminal hairs. Receptacle plane, naked or pilose. 

 Fruit not beaked, papillose or hairy. Pappus setose, several-seriate. 

 (Section Clarioncea, with glabrous receptacle ; and section Homoianthns, 

 with hairy-fimbrilliferous receptacle.) 



Species 75, from Arizona and Texas to Patagon.; most in the Andes, 

 a few in S. Brazil. 



KEY TO THE SPECIES. 

 A, Erect. Stem or its branches i -headed. 

 b. Glabrous. 



c. Leaves lanceolate, entire, petiolate. The cauline sessile, cordate-sagittate. 



lactucoides. 



c2. Leaves linear, with marginal spines ; the upper sparse, erect. linearis, 



^3. Leaves pinnatisect, lobes spiny-tipped. Cauline linear, and spiny. lecJilcri. 

 l>2. Pubescent upwards. Leaves chiefly basal, pinnatisect, the segments mucronate. Head 

 nodding, blue. pcdiculariafolia. 



A2. Erect ; heads few. Leaves pinnatipartite ; lobes ovate. Involucre scales short. 



brachylepis. 

 A$. Ascending. Leaves sessile. Flowers blue. 



b. Leaves linear, entire, apically white-mucronate. Scapes with broad leaves. 



patagonica. 

 62. Leaves broad-linear, recurved, with marginal spines. Peduncle nearly naked. 



recurvata. 



A^. Cespitose perennial, glabrous, with wool on the petioles. Leaves narrow-linear, entire. 

 Heads sessile amid the upper leaves, white. sessiliflora. 



