Blake — A Revision of the Genus Viguiera 101 
acutish blackish apex, vittate, densely pilosulous above, 5-6 mm. 
long. Achenes lucid, substriate, rather strongly compressed, gla- 
brous, 2.5 mm. long. Pappus none. — Gymnolomia Greggii Gray! 
Proc. Am. Acad. xv. 36 (1879); Rob. & Greenm. Proc. Bost. = 
Nat. Hist. xxix. 89 (1899). — MEXICO: Coanuma: limes 
hills, Carneros Pass, 1889, Pringle 2387 (G.); Saltillo, cre 
Palmer_312 (G.); Chojo Grande, 43 km. S. E. of Saltillo, 1904, 
397 (G.); San Lorenzo Canyon, 9.6 km. 8. E. of Saltillo, 
1904, Palmer 42 (G.); hills near Saltillo, 1675 m., 1904, Pringle 
es ); Sierra de la Paila, 1910, Purpus 4698 (G). Northern 
Mexico without definite locality, 1848-49, Gregg 382 (TYPE: G.). — 
Flowering Aug.—Nov. — T. 2. Fia. 10, T. 3. Fie. 5. 
Section 3. Diplostichis, sect. nov. Herbae annuae vel rarissime 
frutices, foliis saltem inferioribus oppositis lanceolatis vel ovatis, 
capitulis parvis (disco 4—(fructu)12 mm. diametro), involueri 2- 
seriati phyllariis infra subinduratis vittatis supra subherbaceis, 
pappo rarissime nullo. — Species typica V. tenuis Gray. — Eight 
species ranging from Sinaloa to Colombia, Venezuela, and Ecuador. 
The section is most nearly related to the Dentatae, but differs in the 
slender and usually more delicate habit of the plants, the small 
heads, and the more obscure differentiation of the individual 
phyilaries into indurated base and abruptly narrowed herbaceous 
apex. Species 50—57. 
a. ee linear-lanceolate, long-attenuate; leaves sub- 
Sere eee pee ne er ae Seeman ee i TT V. tenuis 
S. Phyllaries Sony atae or ovate-lanceolate; leaves slender- 
petiole 
b. Eianches = the inflorescence and pedicels rufous-pilosu- 
lous or sordid-pilose; South American, c. 
c. P nd resent; heads S very numerous ......-..---, = anomala 
c. Pappus none; hee $e V. quitensis 
b. Branches of the infloreanende and RES not as 
il Red or sordid-pilose, d. 
d. Phyllaries densely canescent-strigillose.......... 54. V. gracillima. 
pe erg to ona sod nesonet 34 
é in flower slenderly short-cy Cc, mim. : 
thick, crowded at tips of branches ....... 55. V. Brandegei. 
e. Hi in flower more or less subglobose, 5 mm. 
hie more, f. 
f. Phyllaries nearly glabrous except on margin.. .51. V. strigosa. 
f. Phyllaries distinctly pubescent on back, g. 
g- Involucre _ rae beneath gland-dotted; 
tS RICA. oo. 6 ee a ew ees 
g- see and leaves beneath not gs? 
dotted; Colombia and Venezuela ....52. V. mucronata. 
