42 The Botanical Gazette. [February, 
Vernonia Heydeana, n. sp. Like the last; but lower (2° 
high), with broader leaves which are often not so taperf- 
pointed at either base or apex, 6-flowered heads, involucral 
scales in but two or three much looser series and all of them 
obtuse, and glabrous achenes.—San Miguel Uspantdn, De- 
part. Quiché, alt. 6-12,000*, April 1892, Heyde & Lux 3,392. 
The two preceding species, with V. Pal/meri Rose, may all 
be forms of one shrubby species which extends the whole 
length of western Mexico. With the material at hand the 
forms are readily separated, but they give evidence of such 
close relationship that more abundant material may show in- 
tergradations. 
VERNONIA PATENS HBK.—Santa Rosa, Depart. Santa Rosa, 
alt. 3,000", February 1893, Heyde & Lux 4,524.—A South 
American shrub 2 to 3™ high, heretofore not reported north 
of Panama, but likely to have been confounded with V. Dep- 
peana Less. 
Vernonia Shannoni, n. sp.—A tree (height unreported): 
leaves long-oval, taper-pointed at each end, petioled, entire, 
glabrous: heads 5-flowered, somewhat closely corymbose and 
pedicellate: involucral scales in five or six rows, the inner ones 
elongated-oblong and obtuse, the outer ones becoming grad- 
ually shorter, more broadly ovate and acutish, all somewhat 
purplish-tinted and sparsely hairy on the margins: achenes 
glabrous.‘‘Continental divide,” Depart. San Marcos, alt. 
9,191", January 1892, W. C. Shannon 605. 
The material is very scanty, but seems sufficient for char- 
acterization and subsequent recognition. Apparently se! 
nearly related to V. iatroides DC. and V. serratuloides HBKs 
but they are herbaceous. Mr. Shannon notes the tree as be- 
ing ‘‘white-flowered.” 
Ageratum rugosum, n. sp.—More or less rough pubescent 
throughout: leaves short petioled, ovate, crenate, acuminate, 
thickish (almost coriaceous), somewhat scabrous above am 
more softly and abundantly hairy beneath especially along the 
prominent reticulations, 5 to 7™ long: heads purple-flowered, 
the linear involucral scales with slender often elongated acu- 
minations: pappus of five lanceolate scales, but one, two oF 
three of which taper into awns: achenes very glabrous. Santa 
Rosa, Depart. Santa Rosa, alt. 3,000°, November 1892, Heyde 
& Lux 4,24 
3. 
The whole habit of this species is that of A. corymbosum 
