552 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Distinguished from H. mucronata by its sordid subglandular pubescence, 
and slightly larger heads. 
12. Hemibaccharis sescenticeps Blake, sp. nov. 
Herbaceous above, the lower portion not seen; stem stoutish, branched above, 
glabrous and glaucescent or thinly arachnoid-tomentulose and glabrate; inter- 
nodes 2.5 to 7 cm. long; petioles naked, glabrous or thinly tomentulose, 1 to 
2.5 em. long; leaf blades oval or oval-ovate, 6 to 18 em, long, 3 to 6 em, wide, 
short-acuminate, rounded to cuneate at base, mucronate-serrate, membranaceous. 
to chartaceous, above along the veins sordid-puberulous, on the surface glabrous. 
or tuberculate-hispidulous and glabrate, smooth or slightly rough, beneath 
somewhat paler green, sordid-puberulous along the chief veins, on surface very 
sparsely so or glabrous, featherveined, the lateral veins 5 to 7 pairs, prominulous 
beneath; heads very numerous at apex of stem and upper branches, forming 
large pyramidal panicles 10 to 21 cm. wide, the pedicels densely sordid- 
pilosulous, mostly 3 to 7 mm. long; pistillate heads 4 to 45 mm, high, the 
pistillate flowers about 27, the hermaphrodite 2; staminate heads 3.5 to 4 
mm. high, about 22-flowered; involucres 3 to 4-seriate, somewhat graduate, 2.5 
to 3.5 mm. high, the phyllaries linear or linear-lanceolate, acute to acuminate, 
with narrow green midline and scarious margins, somewhat ciliolate; teeth 
of the hermaphrodite corollas longer than the tube, the style branches linear- 
oblong, acute, hispidulous; achenes compressed, 2-nerved, hispidulous, the 
dull whitish pappus 8 mm. long; bristles of hermaphrodite pappus somewhat 
dilated above. 
Type in the U. 8. National Herbarium, no. 5703833, collected in moist open 
woods and along creeks, Mount Ixtaccihuatl, State of Mexico, Mexico, altitude 
2,185 to 2,440 meters, November, 1905, by C. A. Purpus (no. 1501). 
ADDITIONAL SPECIMENS EXAMINED: 
JaLisco: Between Mascota and San Sebastian, 1897, Nelson 4055 (N). 
STATE OF Mexico: Mount Ixtaccihuatl, 1903, Purpus 20 (N). 
GUERRERO: Top of Sierra Madre near Chilpancingo, altitude 2,745 to 3,110 
meters, 1894, Nelson 2203 (N), 2204 (N). 
Distinguished by its glabrous or thinly arachnoid-tomentose stem and large 
leaves. In this as in some other species the outer flowers in the staminate 
head are often somewhat more slender than the central ones, and their sta- 
mens are more or less separate and aborted. 
13. Hemibaccharis androgyna (T. 8. Brandeg.) Blake. 
Baccharis androgyna T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 77. 1914. 
TYPE LOCALITY: Cerro del Boquer6én, Chiapas. 
SPECIMEN EXAMINED: 
Curapas: Cerro del Boquer6én, September, 1913, Purpus 6666 (type collec- 
tion; N). 
Distinct in its slender glabrous stem and narrowly lanceolate, faleate- 
attenuate, glabrous leaves. The scarcely mature pistillate heads are 3 to 3.5 
mm. high, with about 22 pistillate flowers and 1 or 2 hermaphrodite. In the 
latter the anthers are reduced to vestiges on the throat, and the style is 
undivided and subtruncate. The staminate plant is unknown, 
14, Hemibaccharis asperifolia (Benth.) Blake. 
Baceharis asperifolia Benth. Pl. Hartw. 86. 1841. 
Conyza asperifolia Benth. & Hook.; Hems!l. Biol. Centr. Amer, Bot, 2: 126. 1881. 
Baccharis scabridula T. S. Brandeg. Univ, Calif. Publ. Bot. 6: 77. 1914. 
TYPE LOCALITY: Mixco, Guatemala, 
