Blake — A Revision of the Genus Viguiera 159 
acutis dense canescenterque tuberculato-strigosis et -strigillosis 
basi induratis pallidis subcostatis apice longiore herbaceo plus 
minusve patente. 
Herbaceous, erect, about 1 m. high, above very sparsely 
branched, leafy; stem stout (5 mm. thick below), substriatulate, 
very densely pilose, the hairs rather soft, spreading or retrorse, at 
base slightly tuberculate. Leaves alternate, ovate or oval-ovate, 
sessile, at apex obtuse or rounded to subtruncate, at base slightly 
cordate, amplectent, above the middle obscurely crenate-denticu- 
late or subentire, 3(—5)-nerved, dull green above, harshly tuber- 
culate-strigillose, beneath slightly paler, rather densely tuberculate- 
hispid-pilose and -pilosulous, subreticulate-venose, 1.8-3.7 em. 
broad, 1.2-2.2 em. wide, the upper gradually reduced. Heads 
about 7, 2.2 em. wide, on terminal and axillary naked or 1-bracteo- 
late rather softly spreading-hispid-pilose peduncles 4.5-7.5 cm. 
long; disk 8-11 mm. high, 10-14 mm. thick. Involucre sub-4- 
seriate, slightly graduated, 6-7 mm. high, the phyllaries lanceolate 
or oblong-lanceolate, acute, callose-mucronate, densely and canes- 
cently tuberculate-strigose and above -strigillose; at base indur- 
ated, pale, subcostate, the longer herbaceous apex more or less 
spreading. Rays about 10, oval-oblong, yellow, puberulous on 
veins of back, 9.5 mm. long, 3.5 mm. wide; disk-corollas yellow, 
minutely puberulous below and on veins and teeth, 3.8 mm. long 
(tube 0.8 mm., teeth 1 mm.), the tube ampliated at base, the throat 
campanulate, the teeth recurved. Pales acute, mucronate, mi- 
nutely strigillose on keel and apex, 6.2 mm. long. Achenes black, 
short-pubescent, somewhat ribbed, more or less thickened, 4 mm. 
long, 2 mm. wide. Awns 2, slender, unequal, ciliate, 2-3 mm. 
long; squamellae about 6, unequal, lacerate, connate to middle, 
1.3 mm. long. — URUGUAY: campos, Tacuarembo, Feb. 1897, 
Arechavelata 49 (rypE: K., fragm. G.). — In habital features most 
closely allied to the Bracteatae, but with the involucre more nearly 
of the Euaureae. 
Subseries B. Pusillae, subser. nov. Annuae ramosae vel sim- 
Plices, foliis infra oppositis supra alternis scabre tuberculato- 
hispidulis vel -hispidis, involucri 2-3-seriati phyllariis linearibus 
vel oblongo-lanceolatis infra induratis apice subherbaceis dense 
hispido-pilosis apice plus minusve reflexis vel laxis, acheniis plus 
