Blake — A Revision of the Genus Viguiera 63 
a. Pales with a stiff abrupt more or less recurved cusp, b. 
. Petioles and under leaf-surface rather densely hispidu- 
fs or puberulous; branches sordid-tomentose 
. V. sphaerocephala. 
b. Petioles and under ee nearly glabrous; 
nches apace peas in sitio oak ee 17. V. oaxacana, 
a. Pales Srthont stiff recurved cusp 
eads very numerous, sibeylindric, 1 cm. — or 
usually much len. i ee V. quinqueradiata. 
:. — fewer, hemispheric a ‘abinatéhemispheri 
m. thick or usually m 
d. Phyllaries with reflexed fac nig a ROOK. ok 22. V. adenophylla. 
d. Phyllaries appressed, e. 
€. Pales very bhumit ..4 6.24.42 18. V. trachyphylla. 
e. Pales acute or cuspidate, f. 
jf. Phyllaries and peuele sparsely ciliate; invo- 
lucre S-eerlate: fs 5. vel ee 19. V. maculata. 
7, Phyllaries and petioles very strongly ciliate; 
nvolucre 4-serlate) on en ee 20. V. eriophora, 
16. V. SPHAEROCEPHALA (DC.) Hemsl. Shrubby, 5-7 m. high, 
the branches sordid-tomentose, bearing rather numerous heads in a 
¢ymose panicle about equalled by the leaves. Leaves opposite, 
Ovate or triangular-ovate, acuminate from near the unequally 
Subcordate base, crenate-dentate, densely tuberculate-hispidulous 
above, scarcely paler, hisnidulous-piloenions and gland-dotted 
beneath, 3(—5)-nerved, 9-10 cm. long, 4.8-5 em. wide, on un- 
margined sordid-puberulous petioles 1.1-2.2 em. long. Ultimate 
pedicels 1-1.9 em. long; heads 4.5-5 em. wide; disk 1-1.2 em. 
high, 1.4-2 em. wide. Involucre 3-4-seriate, the scales oblong, 
acute, ciliolate and sordid-puberulous, somewhat indurated and 
Vittate below, with lanceolate herbaceous spreading tip about as 
long as the body. Rays about 20, 1.7-2 em. long, 6 mm. wide; 
disk-corollas puberulous on teeth, 5-5.5 mm. long (tube 1.4- 
‘6 mm.). Pales puberulous, 7-9 mm. long, with an abrupt 
resin widely spreading mucro at apex. Achenes more or less 
“aga 4 mm. long. Awns 2.3 mm. long; cory © 4, 
112 (1903). V. squarrosa (Greenm.) Blake, l c. xlix. 376 (1913). — 
MEXICO: GUERRERO: mountains above Iguala, 1220 m., 11 Oct. 
1900, Pringle 8390 (rypE coun. of E. squarrosa: B. M., G., K.); 
Mountain slope near Taxmalac, Portizuelo del Picacho Alto, Dist. 
0, 18 Oct. 1904, C. & E. Seler 4251 (Ber., G.). Mexico with- 
out locality: Alaman (ryPE of L. sphaerocephala: Prod. 
