Blake — Revision of Dimerostemma 13 
pilis late patentibus basi plus minusve tuberculatis triplinervia 
3.7-5.5 em. longa 1.5-2.9 em. lata, in petiolis densissime aspereque 
tuberculato-hispidulis et hispidis immarginatis 3 mm. longis; 
suprema minora. Capitulum in pedunculo nudo caulem termi- 
nante 4-6.3 em. longo insidens; discus (fructu) 1-1.2 cm. altus 1.4- 
1.8 cm. crassus. Involucri ca. 4-seriati ad 1.2 cm. alti phyllaria 
(vel bracteae) serierum duarum exteriorum herbacea ovata vel 
oblongo-ovata acuta ad basin plus minusve abrupte contracta ut 
folia pubescentia; ea serierum duarum interiorum breviora oblonga 
obtusa subindurata non herbacea plus minusve tuberculato- 
strigosa vel -strigillosa. Radii . . . ?; corollae disci 4.5 mm. 
longae (tubulo 0.7 mm.) ut videtur glabrae. Paleae acutae mucro- 
natae carinatae in carina et ad apicem spinulosae 6.5 mm. longae. 
Achenia oblique oblongo-obovata paullum incrassata subquad- 
rangularia nigrescentia fere glabra vel sparse tuberculato-strigosa 
3.5 mm. longa. Aristae 2 subtriangulares in angulis ciliatae cum 
alis angustis spinuloso-ciliatis continuae ad 2 mm. longae inaequales 
basi plus minusve dilatatae et laceratae interdum lacerato-con- 
junctae. — Botrvia: East Velasco, 200 m., July 1892, Otto 
Kuntze (ryrE no. 702220, U. 8. Nat. Herb.) — Of interest as the 
first extra-Brazilian species of the genus. The type specimens 
were recorded by Kuntze (Rev. iii. pt. 2, 184 (1898)) as Viguzera 
macrorhiza Baker, an unrelated species. In D. asperatum the two 
awns (trigonous and broad as in all the other species) are con- 
nected at base by their lacerate-decurrent bases — but there is no 
true corona (constricted at base) as in Oyedaea, and the habit is 
entirely that of Dimerostemma. 
4. D. rotundifolium (Baker), comb. nov. Erect, suffrutescent, 
branched chiefly in the inflorescence, the branches strict, erect, 
bearing 1-3 heads. Stem striatulate, rather slender, cinereously 
pilose-tomentose. Leaves opposite to the inflorescence, orbicular, 
obtusish to rounded at apex, truncate to subcordate at base, 
crenate-serrulate with 13-19 pairs of more or less appressed teeth, 
triplinerved, reticulate beneath, above dull green, pilose with 
more or less matted soft hairs, beneath densely white-canescently 
pilose-tomentose, 2-3.2 em. long, 2.5-3.7 cm. wide, on canescently 
pilose-tomentose petioles 3-5 mm. long Heads about 4-11, m 
cymose panicles of 1-3 at ends of branches, 1-7-2 em. wide, leafy- 
bracted at base, the bracts about 2, similar to the uppermost stem 
