OF ARTS AND SCIENCES. 151 



by 3 broad, rather strongly S-ribbed on the back, the thin lateral 

 wings as broad as the seed; commissural face usually more or less 

 strongly 2-3-nerved, with 4 to 6 vittae ; dorsal vittaj 4, with some 

 smaller intermediate ones : seed more or less deeply concave, some- 

 what channelled on the back beneath the broad vittaj. — In the 

 Sierra Madre, near Monterey ; June, 1888 (n. 2211). Differing 

 from most American species in the more than usually channelled 

 seeds, on both the ventral and dorsal sides, and in the nerved com- 

 missure. 



RIIODOSCIADIUM, n. gen. of Peucedanoid UmhelKfercB. Calyx- 

 teeth minute. Stylopodium depressed-conical upon a rather promi- 

 nent uudulately margined disk. Fruit orbicular, flattened dorsally, 

 and with broad thin lateral wings ; dorsal ribs 3, thickened filiform, 

 and often 2 shorter and much less prominent on each side of these ; 

 commissure strongly nerved in the middle ; vittae nearly contiguous 

 about the seed, 8 on the commissure, the dorsal as many or more. 

 Seed somewhat concave on the face. — Tall and slender, with pin- 

 nately compound leaves, small few-rayed umbels in nearly naked 

 lateral and terminal panicles, and dull reddish flowers ; involucres 

 and involucels of a few linear bracts. 



R. PuiNGLEi. Glabrous throughout; cauline leaves ample, bipin- 

 nate with the divisions laciniately pinnatifid ; those on the branches 

 reduced to linear bracts dilated at base : rays 3 to 5, 3 to 5 lines 

 long : fruit nearly sessile, 3 lines long. — On hillsides near Guada- 

 lajara ; October, 1889 (n. 2981). The genus is peculiar in its habit, 

 most nearly related in its fruit to Tiedemannia. The generic name 

 has reference to the color of the flowers, and is also commemorative 

 of the services of Mr. J. N. Rose, of Washington, who has done so 

 much, in connection with Prof. Coulter, to elucidate the American 

 representatives of the order. 



Oreopanax Jaliscana. a small tree (20 feet high), with stout 

 branches, rather sparingly fiirfuraceous- and stellate-pubescent : leaves 

 cordate at base, 5-lobed to the middle, the lobes acute, mostly some- 

 what sinuately toothed or lobed, the petiole about equalling or shorter 

 than the blade (4 to 10 inches broad) : racemes in a broad open 

 panicle (1 to 1}, feet broad); flowers in dense heads subtended by 

 tomentose ovate bracts as long as, or exceeding, the ovaries : corolla 

 spreading or calyptrately deciduous: filaments filiform: ovary 1-3- 

 celled, with as many slender styles ; fruit subglobose, 1-3-celled, 

 black at maturity : albumen strongly ruminate. — In a barranca near 

 Guadalajara; 1888 (n. 1822), and 1889 in fruit (n. 1889). Resem- 



