GREENMAN. — CENTRAL AMERICAN SPERMATOPHYTES. ot 
inner; pappus white, about 5 mm. in length: achenes slightly puberu- 
lent: heads of the staminate plant also about 1 cm. high, many (60-70)- 
flowered ; involucral characters similar to those of the pistillate plant. — 
Mexico. Federal District: Serrania de Ajusco, altitude, 2885 m., 7 
December, 1903, C. G. Pringle, no. 8782 (hb. Gr.). 
Baccharis oaxacana, n. sp. An herbaceous perennial, often stolon- 
iferous, freely rooting at the suffruticose base: stems erect or ascending, 
2 to 5 dm: in height, sparingly branched above, terete, more or less 
glandular-pubescent : leaves alternate, sessile, oblong-obovate, 2 to 7.5 
em. long, 1 to 3 cm. broad, mucronate, shallowly dentate or mucronate- 
denticulate, narrowed below the middle to a broadly winged subpetiolate 
auriculate-amplexicaul base, glandular-hirtellous, paler and somewhat 
villous-pubescent beneath especially on the midrib and lateral nerves: 
inflorescence a terminal corymbose cyme; peduncles short-stipitate- 
glandular: heads of the pistillate plant about 1 em. high, many (70-75)- 
flowered; involucre campanulate, glandular-puberulent to essentially 
glabrous; bracts of the involucre unequal, linear-lanceolate, shorter than 
the flowers, deeply tinged with purple; flowers either all pistillate or 
sometimes with a few (2-4) perfect (?) flowers in the centre of the head ; 
pappus white or slightly tawny, 5 to 6 mm. long; achenes glabrous or 
inconspicuously puberulent: heads of the staminate plant about 8 mm. 
high, 60-70-flowered, the outer cycle not infrequently consisting of 5 
pistillate flowers; involucral bracts sub-4-seriate, narrowly lanceolate, 
acute, purplish and slightly glandular-puberulent.— Mexico. State o 
Oaxaca: Sierra de San Felipe, altitude 2895 m., 138 December, 1895, 
C. G. Pringle, no. 6257 (hb. Gr.), distributed as Baccharis hieraciifolia, 
Hemsl. ; in the same locality, 3 August, 1894, C. G. Pringle, no. 5669 
(hb. Gr.). 
This species is most nearly related to B. hieractifolia, Hemsl., to 
which Mr. Pringle’s specimens were referred by the writer. A more_ 
thorough study in the light of additional material shows very clearly | 
that B. caxacana differs constantly from B. hieraciifolia in having the 
leaves sessile oblong-obovate and auriculate-amplexicaul, not ovate- 
lanceolate and acuminate at both ends. . oaxacana, as well as the 
preceding species, B. glandulosa, Greenm., may be regarded as some- 
what intermediate between Conyza and Baccharis, as they are not dis- 
tinctly dioecious. The sexes are, however, sufficiently differentiated to 
warrant both being placed definitely in the genus Baccharis. 
Desmanthodium fruticosum, n.sp. Shrub, 1 to 1.5 m. in height: 
branches terete, striate, reddish-brown: leaves opposite, ovate, 4to 8 cm. 
