Blake — A Revision of the Genus Viguiera 181 
branaceous-scarious scale; plants of Paraguay, Uruguay, and 
Argentina. Sp. 137-141. 

a. G. Leaves premier aromadeie 9 DONNER. iris eee 137. V. tuberosa. 
a. Leaves green beneath 
b. Leaves rather nin eo Gib Macias creas 139. V. guaranitica. 
b. Leaves pilose or pene io iy 
ce. Involucre 2—3-seriate, 1-1. 5 em. hi 
d. asi a, piace olucre em. high, ds mes 
e at apex; disk-corollas 4~-4.5 mm. lon, 
V. Hassleriana. 
d. pte baticborns involucre 3-seriate, the phyllaries 
ssed; disk-corollas 6.5 mm. long... .. 140. V. nudicaulis. 
c. Tnvolae pee te 1.5-2.3 em. hi age jg tagwakaee 141. V. macrorhiza. 
137. V. TuBEROsA Griseb. Procumbent or ascending from a 
thick woody tuber-like root, the stem pale or fuscous-tinged, rather 
sparsely tuberculate-strigillose, rather leafy below, 0.6—1 m. high, 
bearing a single very long-peduncled head. Leaves opposite or the 
upper often alternate, narrowly lanceolate to linear-lanceolate, 
long-acuminate at both ends, entire, above light green, finely 
tuberculate-strigillose, beneath canescent with a dense minute ap- 
pressed pubescence and somewhat strigose, l-nerved, the two 
lateral veins weak or evanescent, slightly revolute, short-petioled 
or subsessile, somewhat falcate, 5.5-10 cm. long, 4-13.5 mm. broad; 
petioles narrowly margined, 2.5 mm. long or less. Peduncle 
densely strigillose below the head, naked, 2-3.8 dm. long; head 
3.5-5.5 em. wide; disk 1-1.2 cm. high. Involucre 3-seriate, 
strongly graduated, 1—-1.1 cm. high, the phyllaries callose-mucro- 
nate, hispidulous-ciliolate and more or less tuberculate-hispidulous, 
with indurated vittate base and herbaceous or subherbaceous tip, 
the outer narrowly lanceolate, acuminate, the inner oblong- 
lanceolate. Rays 12-16, oblong to oval, 1.2-2.4 cm. long; disk- 
corollas rather sparsely hirtellous, 4.3-5.5 mm. long (tube 0.7- 
0.9 mm.). Pales obtuse, hirtellous on keel and colorate apex, 
mucronulate, 8.5 mm. long. Achenes (submature) hispidulous, 
5.6 mm. long. Awns paleaceous-membranaceous, 1.6-2.3 mm. 
long; squamellae on each side of achene united into an irregularly 
denticulate many-ribbed membranaceous scale nearly or quite 
equalling the awns.—Griseb. Goett. Abh. xxiv. 192 (1879); 
Baker in Mart. Fl. Bras. vi. pt. 3. 220 (1884). — PARAGUAY: 
region of the Yerbales of Maracayi, Sierra de Maracayti, 1898-99, 
Hassler 4295 (B. M.), 5459 (B. M.). ARGENTINA: ee 
del Uruguay, Oct. 1878, Lorentz 581 (B, M., Ber., fragm. and 
€ 
