226 BOTANICAL GAZETTE [MARCH 
EUPATORIUM OCCIDENTALE decemplex, n. var.—Tufted, the 
slender stems from the branches of the rhizomatous woody caudex, 
3-5 dm. high, pale, slightly puberulent: leaves alternate, rather 
numerous above, smaller, more distant downward or wanting at 
base, bright green, thin, obscurely scabro-puberulent, ovate, obtuse 
or acute, rounded or broadly cuneate at base, short-petioled, 
rather strongly reticulate veined below, entire to rather coarsely 
dentate: heads several-many, in a short foliose narrow cymose 
panicle, puberulent on the bracts and pedicels: involucre tubular- 
campanulate, 3-4 mm. high, barely half as high as the disk; its 
bracts linear-oblong, subacute, about 10 and the flowers about the 
same number, scarcely striate (a midrib and sometimes a pair of 
faint nerves): corolla rose color, narrowly tubular, about as long 
as the few scabrous (about 20) pappus bristles and longer than the 
linear 5-nerved brown achenes. 
I have characterized in detail because descriptions of the species available 
in the manuals are either too brief or else have been gradually so modified as 
to include some of the forms that seem worthy of being listed separately. The 
variety here proposed differs primarily in its slender stems, thin bright-green 
leaves, and the marked uniformity in the number of involucral bracts and rose 
colored flowers (ten of each). The original collections of the species had 
15-25 bracts with white or ochroleucous flowers of about the same number as 
the bracts. 
The more southern form of this, which has so long passed as a variety of 
E. occidentale, is well worthy of specific rank, and I wish so to list it here. 
Eupatorium arizonicum (Gray), n. sp.—E. occidentale arizonicum 
Gray, Syn. Fl. 1:101. 1886. This is at once distinct by its aspect, 
the stoutish stems, more or less branched from the base up, the 
thickish pale leaves with rather indistinct venation, and more 
particularly by the several corymbose-cymose clustered whitish 
flowers on the more or less elongated branchlets, giving a corym- 
bose effect to the whole inflorescence. The leaves are opposite and 
fairly uniformly truncate-subcordate to deeply cordate at base. 
E. arizonicum is far more closely allied to E. ageratoides than to E. occi- 
dentale, This species seems to range from New Mexico to Arizona and north 
into Nevada and Utah. 
Macronema aberrans, n. sp.—Roots woody, rather slender, 
creeping in rock crevices, their crowns more or less branched: stems 
