550 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
by H. von Tiirckheim (no. II. 1686). Duplicate of this number in the Gray 
Herbarium, dated February, 1907. 
Represented also in the National Herbarium by a staminate specimen from 
the same locality, altitude 1,400 meters, March, 1903, von Tiirckheim II. 728 
(J. D. Smith, no, 8405). Distinguished from H. hirtella by its larger heads, 
and from H. torquis by its narrower leaves and longer pubescence. 
9. Hemibaccharis torquis Blake, sp. nov. PLATE 51. 
Frutescent, scandent, the stem terete, grayish, glabrate, the branches strongly 
zigzag, sordidly puberulous or pilosulous, glabrescent; petioles 2 to 7 mm. 
long, essentially naked; leaf blades oval or ovate-oval, 3 to & em. long, 1.8 to 
0.5 em. wide, acute or short-acuminate, rounded or cuneate-rounded at base, 
remotely mucronute-dentate er denticulate with very depressed teeth, submem- 
branaceous, above deep green, evenly but not densely pilosulous or puberulous, 
glabrescent, smoothish, beneath duller green, sordid-pilosulous chiefly along 
the veins, feather-veined, the lateral veins 4 or 5 pairs; panicles rounded, about 
5 em. wide, axillary and terminal on the branchlets, the pedicels sordid-puberu- 
lous, 2 to 9 mm, long; pistillate heads 4 to 5 mm, high, the pistillate flowers 
about 30, the hermaphrodite 2; staminate heads 5 mm. high, 20 to 22-flowered ; 
involucres about 5-seriate, graduate, 3.5 to 4 mm. high, the linear to (outer) 
linear-lanceolate phyllaries acute, with green midline and whitish margins. 
ciliolate, sparsely puberulous dorsally; hermaphrodite corollas with 5-parted 
limb, the style branches linear-oblong, acutish; achenes compressed, 2-nerved, 
hispidulous, 0.8 mm. long, their pappus 2.5 mm. long, brown-tinged; pappus of 
the hermaphrodite flowers slightly thickened toward apex. 
Type in the U. S. National Herbarium, no. 471504, collected behind the 
“hospice des aliénés,” San José, Costa Rica, November, 1892, by A. Tonduz 
(no, 1535, distr. Herb. Boiss.) 
ADDITIONAL SPECIMENS EXAMINED: 
Veracruz: Valley of Cérdoba, 1865, Bourgcau 1637 (N). 
Oaxaca: Altitude 1,750 meters, 1900. Conzatti & Gonzdlez 44 (N). 
GUATEMALA: Cobian, altitude 1,310 meters, 1887, von Tiirckheim 1350 (N). 
Costa Rrca: San José, altitude 1,135 meters, 1893, Tonduz 1549 (N). 
Related to H. flerilis, but distinguished by its much broader leaves and 
shorter pubescence. The type collection was distributed as Stevia rhombifolia 
H. B. BK. 
EXPLANATION OF PLATE 51.—Hemibaccharis torquis, from the type specimen. Natural 
Srze, 
10. Hemibaccharis mucronata (H. B. K.) Blake. 
Baccharis mucronata H. B. K. Nov. Gen. & Sp. 4: 60. 1820. 
Pluchea floribunda Hemsl. Diagn. Pl. Nov. 2: 382. 1879. 
TYPE LocALITY: Between Santa Rosa and Los Ioares, Guanajuato. 
SPECIMENS EXAMINED: 
CHIHUAHUA: In 1885, Palmer 277 (N), 281 (N). 
San Luis Potosi: Parry & Palmer 338 (N), 339 (N); Schaffner 359/783 
(N); in 1902, Palner 168 (N), 
JALisco: In 1886, Palmer T3837 (N); Pringle 2364 (N); Jouy (N). 
MicHoacAn: Arséne 3241 (N), 3646 (N), 5296 (N). 
Srate oF Mexico: Bourgean 969 (N); Purpus 1502 in part (N), 1579 (N). 
FeperaL District (Mexico): Bowurgeau 1096 (N); Pringle 11288 (N), 
11482 (N). 
TLAXCALA: Arsene (N). 
Puesta: Arséne 2090 (N), 2267 (N), 5491 (N), T7206 (N). 
Guerrero: Nelson 2127 (N), 2262 (N). 
