Blake — Revision of Dimerostemma 11 
¢. ioaes om to ovate or oblong-ovate, harshly hispid- 
Lopes WO a's. cin Bie mee fo eee ies Es as 3. D. asperatum, 
b. Hea  peclunculate more or less cymose-panicled, d. 
d. es densely and softly ee beneath; 
"stern ensely pilose-tomentose wit. spreading 
e. Leaves ‘ ctidalag, softly densely pilose above. est D. rotundifolium. 
e. Leaves broadly ovate, roughish above with 
short tuberculate-based hairs............... & D. brasilianum, 
d. Leaves densely hispidulous-pilosulous beneath; stem 
strigose-pilose with ascending or subspreading, 
flexuous tubereulate-based MOD cay viens Cows es D. lippioides. 
1. D. retifolium (Sch. Bip.), comb. nov. Apparently suffrutes- 
cent, erect, simple below the 5-headed cymose panicle. Stem 
brownish, striate, subdensely appressed-puberulous, — slender. 
Leaves alternate, oval, obtusish, mucronate, broadly rounded to 
barely cordate at base, crenulate-serrulate with about 16 pairs of 
rounded depressed teeth, triplinerved, finely and conspicuously 
reticulate both sides, thickish, plane, densely strigillose and 
of the same grayish-green hue both sides, 2.8-5.3 cm. long, 1.4-3.6 
cm. wide, on marginless flattened petioles 1-2 mm. long, densely 
and minutely strigillose. Heads axillary and terminal, discoid, on 
monocephalous densely minutely strigillose peduncles 2-24 mm. 
long. Disk 8 mm. high, 14 mm. wide. Involucre 7-8 mm. high, 
3—4-seriate, scarcely graduated, the outermost phyllaries ovate or 
obovate, obtusish, herbaceous, reticulate, constricted near the 
middle, minutely and densely strigillose, unequal, some of them 
exceeding the other phyllaries, these oblong, acutish, strongly 
indurated, chartaceous-coriaceous, brownish, densely and finely 
strigillose except on margin, ciliate above. Rays apparently none; 
disk-corollas apparently yellow, tubular, glabrous except on teeth, 
4 mm. long, the tube (0.8 mm. long) only slightly more slender than 
the throat. Pales narrow, indurate, finely strigillose toward the 
acutish apex, 7.5 mm. long. Achenes (immature) narrow-oblong, 
not thickened, glabrous, about 4 mm. long; the two stout awns 
subequal, finely spinulose on keel, 3.5 mm. long. — Viguiera ? 
retifolia Sch. Bip.! ex Baker in Mart. Fl. Bras. vi. pt. 3, 223 (1884). 
—Braziu: fields along the Rio Pardo, Matto Grosso, Riedel 
(TYPE cotu.: K, fragm. G). 
2. D. vestitum (Baker), comb. nov. Erect, simple or sparsely 
branched, suffrutescent. Stem striatulate, stoutish, like the whole 
plant dull and cinereously pilose-tomentose with dense spreading 
