OF ARTS AND SCIENCES, 165 
lets deeply 2-3-parted, the segments ovate or lanceolate, acuminate, 
more or less narrowed at base, 1 to 14 inches long, 10 lines or less in 
breadth, green above, pale beneath, serrate, the margins of the teeth 
being slightly thickened and cartilaginous ; upper leaves scattered in 
the diffusely branched inflorescence, pinnately or ternately parted with _ 
long linear toothed or serrate segments ; the highest leaves reduced 
to filiform bracts; involucres and involucels none: umbels numerous, 
with few (2 to 6) often unequal rays 6 to 9 lines in length; umbellets 
about 12-flowered, only 2 or 3 flowers in each being fertile: corolla 
white (?) or in the sterile flowers not infrequently purple: fruit a line 
long, the ribs not very prominent ; stylopodium depressed, the margin 
crenate ; oil-tubes numerous; inner surface of the seed plane or very 
shallowly concave. — Hills of Patzcuaro, Michoacan; November, 
1890 (n. 3331). 
Evpatorium Espinosarum, Gray, var. SUBINTEGRIFOLIUM. 
Leaves ovate, acuminate, subentire, very glutinous on both sides: 
scales of the involucre a little longer and more acute than in the 
typical form, being in these respects more as in var. ambiguum, Gray. 
— Shaded ledges of lime-rock, San José Pass, San Luis Potosi; Oc- 
tober, 1890 (n. 3311). 
GYMNOLOMIA DECUMBENS. Stems several from a ligneous base, 
' decumbent, simple or branched from near the root, smoothish below, 
roughened above with very short appressed hairs: lower leaves oppo- 
Site, elliptical, acute, narrowed to a sessile base, subentire, thickish, 
Tough-pubescent, green on both sides, 14 inches long by half as broad ; 
the upper similar but narrower, alternate, sparse : heads terminal, soli- 
tary or 2 or 3 together; involucre $ inch in diameter; outer scales 
ovate, acuminate, very rough, the inner larger, smoother, obtusish ; 
chaff oblanceolate, acuminate; rays 12 to 15, narrow, over half an 
inch in length, yellow ; achenes (immature) smooth, angled, and with 
no trace of teeth or awns, — Rocky hills, Tultenango, State of Mex- 
100; September, 1890 (n. 3263). This species resembles G. rudis, 
Gray, but differs in its decumbent habit, smaller and more entire 
leaves, smaller heads, ovate not oblong involucral scales, and longer 
narrower rays, From G. multiflora, Nutt., it differs in the ligneous 
clearly perennial base, as well as in the involucre, etc. 
: Oroparpys ALTERNIFOLIUS. Stem 3 to 6 feet high, striate, smooth- 
Ish or slightly tomentulose : leaves alternate, ovate-lanceolate, acumi- 
nie at both ends, subsessile, with a short roughish pubescence above, 
White-tomentose beneath: heads in an open corymb, about 15, half an. 
inch or more in diameter ; scales of the involucre in several rows, nar- 
