MACLOSKIE I COMPOSITE. 877 



c2. Primaries spinescent. Secondaries rosulate. 



d. Primaries linear-subulate. Secondaries minute, ovate. Heads in 2*s or 3's, 1-2- 



flowered. patagonica. 



d2. Primaries broad-subulate ; secondaries short, obtuse. Heads subglomerate. 



rosulata. 



3. Leaves cuneate-oblong, serrate, imbricate. magellanica. 



64. Leaves ovate, spinose, serrate. Glomerules in a leafy raceme. pyramidalis. 



A$. Mastigophorus. Heads solitary. Pappus pales I 2-seriate. 



b. Low, branching shrubs, with short, broad, thick, sessile leaves, imbricate and amplexicaul. 

 c. Heads sessile. 



d. Leaves recurved, silky ; 5 white flowers in the head. ameghinoi. 



d2. Leaves orbicular, etnarginate ; 5 yellow flowers. bryoides. 



d$. Leaves deltoid, pilose-glabrescent, entire or two-toothed. morenonis. 



c2. Heads small, solitary on short branches. Leaves suborbicular-deltoid, silky. Achenes 



villous. modesta. 



62. Low, branching, with leaves longer than wide. 

 c. Heads terminal, solitary. 



d. Leaves linear-subulate, spinulose-toothed. Petioles dilated at insertion. 



remeyana. 



d2. Leaves lanceolate, spinulose-serrate. gaudichaudii. 



c2. Leaves narrow, pungent. Achenes villous. 



d. Heads on short axillary branches. Leaves linear. scleranthoides. 



d2. Heads solitary, ending the branches. Leaves subulate. ulicina. 



3. Cespitose. Leaves spiniferous. 



c. Leaves ovate, glabrous ; branches cottony below. Achenes glabrous. Heads small, 



solitary in the axils. chubiitensis. 



c2. Leaves ovate-triangular, recurved ; those on sterile branches basally cucullate, ending 

 in a long spine. Heads terminal, solitary. struthionum. 



i. NASSAUVIA ABBREVIATA (Hook. & Arn. sub Panargyrus). 



Cespitose, glabrous, branching at the base, substoloniferous. Leaves 

 rigid, spreading, recurved, linear, acuminate, mucronate, entire, sheathing 

 at the base, with silky axils. Heads in terminal hemispherical glomerules. 

 Pappus plumose. 



Magellan ; N. Fuegia (Dusdn). 



N. ABBREVIATA SUBSPINOSA Phil. 



Chubut, in dry rocks ; Fuegia. 



2. N. AMEGHINOI Speg. 



(Mastigophoms.'] Shrubby, branching, cespitose. Leaves remotely 

 imbricate, recurved, minute, thick, entire, their venter convex, glabrous, 

 2-sulcate, dorsally appressed, silky-villous, sessile, i -toothed on each side 



