534 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Ageratum sordidum Blake, sp. nov. 
Suffrutescent, erect, 35 cm. high and more, with few opposite erect branches; 
stem stoutish, about 3 mm. thick, very densely and sordidly viscid-glandular- 
pilose with several-celled spreading hairs, glabrescent below: internodes of 
main stem 0.8 to 3 cm. long; leaves opposite or ternate, pubescent like the 
stem, often with short leafy branches in their axils; petioles narrowly 
margined, 6 to 15 mm. long; blades ovate to oblong- or triangular-ovate, 1.7 
to 3.2 em. long, 7 to 15 mm. wide, obtuse, at base rounded or truncate-rounded, 
dentate-crenate with about 12 pairs of rounded teeth, pergamentaceous, tripli- 
nerved, the secondary veins few, prominulous beneath; panicles cymose, 
rounded, ternately divided, terminating stem and upper branches, 7 to about 
40-headed, 2.5 to 6 em. wide; pedicels 2 to 7 mm. long; heads subglobose, 
about 56-flowered, 6 to 7 mm. high, 6 to 8 mm, thick; involucre 2-seriate, 
subequal, 5 mm. high, the phyllaries few (about 12), oblong, short-acuminate, 
densely glandular-pilose and glandular-ciliolate, with erectish or somewhat 
loose tips, about 5-nerved, the outer ones with thickened costa; receptacle 
naked ; corollas white, stipitate-glandular on teeth and sometimes very sparsely 
so on tube, 38 mm. long (tube 1.2 mm., throat slender-campanulate, 1.3 mm., 
teeth 0.5 mm.) ; achenes slenderly prismatic-obconic, often somewhat curved, 
d-ribbed, blackish, sparsely hispidulous, 2 to 2.5 mm. long, with conspicuous 
whitish carpopod; pappus of 5 oblong lacerate exaristate squamellae, connate 
only at very base, 0.8 mm. long. 
Type in the U. 8. National Herbarium, no. 602315, collected on the Péramo de 
Timotes, Mérida, Venezuela, altitude 3,600 meters, March 20, 1910, by Alfredo 
Jahn (no, 121). 
A member of the section Huageratum, well distinguished by its sut- 
frutescent habit, dense viscid-glandular pubescence, and exaristate squamellae. 
Podocoma bartsiaefolia Blake, sp. nov. PLATE 45. 
Suffrutescent, several-stemmed, 23 to 30 em. high, densely viscid-pubescent 
throughout with spreading several-celled gland-tipped hairs, and sparsely 
spreading-pilose; stems slender, simple, erect, or ascending, densely leafy; 
leaves alternate, linear, 1.5 to 3.5 cm. long, 1.5 to 5 mm. wide, truncate at 
apex, sessile and auriculate-clasping, repand-crenate, revolute-margined, 1- 
nerved, dull brownish green; heads 1 to 4 at apex of stem, campanulate-sub- 
globose, 1.8 to 2.5 em. wide, 9 to 11 mm. high, very many-flowered, on mono- 
cephalous peduncles 1.7 to 3.2 em. long; involucre about 3-seriate, subequal, 
8 to 10 mm. high, the phyllaries linear-lanceolate, acuminate, 1 to 1.5 mm. 
wide, appressed, blackish green, subherbaceous, with very narrow subscarious 
margins; rays very numerous, several-seriate, the tube slender, 4 to 4.5 mm. 
long, sparsely pilose above with several-celled hairs, the whole style included, 
the lamina elliptic-ovate, bidenticulate, erect or spreading, 1.2 to 1.5 mm. 
long; disk corollas slender-funnelform, pilose at base of throat, 5.5 mm. long 
(tube 2.5 mm., throat 2 mm., teeth ovate, 1 mm.); achenes of ray ellipsoid- 
fusiform, about 6-nerved, glabrous, 3.5 to 4 mm. long, with short carpopod and 
slender beak (0.8 to 1.1 mm, long), the pappus bristles about 18, rufidulous, 
hispidulous, deciduous in groups or singly; achenes of disk infertile, linear- 
fusiform, 2.5 to 3 mm. long, rather obscurely beaked, 5-nerved, their pappus 
Similar to that of the ray; style branches of hermaphrodite flowers oblong- 
linear, rounded, unappendaged, papillose on margin. 
Type in the U. 8S. National Herbarium, no. 602280, collected on the Paramo de 
Timotes, Mérida, Venezuela, altitude 3,000 to 3,500 meters, December 6, 1910. 
by Alfredo Jahn (no, 86). 
