MACLOSKIE : COMPOSITE. 877 



C2. Primaries spinescent. Secondaries rosulate. 



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



flowered. patagonica. 



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



rosulata. 



b$. 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. amegfnnoi. 



d2. Leaves orbicular, emarginate ; 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. 



b2. 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. 



b$. Cespitose. Leaves spiniferous. 



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



solitary in the axils. chubutensis. 



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. 

 Pappiis plumose. 



Magellan; N. Fuegia (Dusen). 



N. ABBREVIATA SUBSPINOSA Phil. 



Chubut, in dry rocks ; Fuegia. 



2. N. AMEGHINOI Speg. 



(Mastigophorus.] 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 



