ROSE—MEXICAN AND CENTRAL AMERICAN PLANTS. 335 
The detached leaves vary so much in shape and toothing of the leaflets and in the 
character of the rachis as to suggest two species. Mr. Pringle, however, is very con- 
fident that we have but one. In case there is a mixture the leaf with obtuse seg- 
ments is to be excluded. In its thin leaves and winged rachis this much resembles 
P. acuminata, but in several other respects it is very different. 
Prionosciadium moschatum Rose, sp. nov. 
Tall perennial, 1 to 3 meters high, much branched; leaves large, ternately divided, 
the main and secondary branches not winged; segments oblong, each confluent at 
base with its mate forming a wedge-shaped projection down the rachis, somewhat 
scabrous, very decidedly so beneath, and with crenate mucronate teeth; inflorescence 
much branched and crowded; umbels small on short (2 to 5 em. long) often vertic- 
illate peduncles; peduncle, rays, pedicels and fruit more or less roughened; involucre 
wanting; involucel bractlets several, linear, longer than the pedicels; rays 1 to 2.cm. 
long; pedicels 2 mm. long; fruit seen immature, scabrous on the ribs. 
The species is nearest P. inexicanum, but the fruit is roughened, ete. 
Collected by J. N. Rose near Chalchicomula, Puebla, at the base of Mount Orizaba, 
. July 24, 1901 (no. 5664). 
This species, like many species of the Arracacias, has a strong odor of musk. 
Prionosciadium palustre Rose, sp. nov. 
Perennial, caulescent, 1 to 2 meters high, glabrous throughout; basal leaves ter- 
nately divided, the rachis evenly winged to the very base; wing thin and entire; 
segment rather small, 3 to 6 em. long, ovate, with an entire cuneate base, acuminate, 
sharply serrate; pedicels very short, | to 3 em. long; involucre bracts 1 to several, 
sometimes linear, sometimes resembling reduced leaves; involucel bractlets several, 
linear, somewhat longer than the pedicels; rays short, 10 mm. or less long; pedicels 
2 or 3mm. long; fruit broadly oblong, 8 to 10 mm. long, glabrous, rounded at apex, 
cordate at base; wings as broad as body; oil tubes 2 or 3 in the interval, 4 to 6 on the 
ventral surface; stylopodium none; seed face deeply concaved. 
Collected by J. N. Rose and Jos. H. Painter in swamp near Yautepec, Morelos, 
August 27, 1903 (no. 6555). 
Somewhat resembling P. acuminatum, but still very different. 
Prionosciadium seleri Rose, sp. nov. 
Doubtless a tall branching perennial, but no data given by collector; basal leaves 
twice ternate, then pinnate, the main rachis and primary branches not winged, the 
leaflets more or less confluent at base, the pubescence on both sides but more 
abundant beneath, consisting of very short, stiff yellow hairs; leaflets obtuse, ser- 
rate; inflorescence consisting of many short-peduncled umbels, either opposite or 
verticillate, pedicels very short; fruit seen immature, glabrous. 
Collected by C. and FE. Seler in Guatemala, June 10, 1896 (no, 3106). 
This species seems to belong to the P. pringle: type. 
Prionosciadium townsendi Rose, sp. nov. 
Stems 150 cm. high, glabrous and pale; leaves broad, ternate then pinnate (in all 
specimens seen), the alternate segments or pinnae more or less confluent and taper- 
ing below into a more or less winged and toothed rachis; leaflets lanceolate, acute, 
sharply and finely serrate, sometimes 8 cm. longand 3 cm. broad; umbels numerous 
and verticillate, sometimes only 3 to 10 cm. long; rays numerous, about equal, 2 to 4 
em, long; pedicels 5 to 6 mm. long; rays and pedicels a little scabrous; involucels of 
numerous linear bractlets; fruit glabrous, narrowly oblong, 11 to 12 mm. long, 6 mim. 
broad, wings about as broad as body, strongly notched at base. 
Collected by C. H. Tyler Townsend and C. M. Barber (no. 381), in the Sierra 
Madre, 20 miles southwest of Chuichupa, Chihuahua, August 29, 1899. 
Perhaps nearest P. pringlei, but glabrous, with different leaflets, ete. 
