VOL. XII. NO. 41—BOTANICAL GAZETTE.—NOV.,, 1887. 
Notes on Umbellifere of E. United States. VII. 
JOHN MM. COULTER: AND j- N. ROSE. 
(WITH PLATE XV.) 
REPOCARPUS Nutt.—Fruit linear-oblong, flattened 
laterally : carpel somewhat dorsally flattened, with the 5. 
primary ribs filiform or obsolete, the 4 secondary ones promi- 
nent: oil-ducts solitary under secondary ribs, two on com- 
missural side: stylopodium conical, with very short style: 
(figs. 87, 8 ).—Glabrous annuals, with thin pinnately de- 
‘ompound leaves and linear segments, lateral few-rayed 
umbels opposite the leaves, white flowers, and prominent 
Calyx-teeth, 
I. T. ¥thuse Nutt. DC. Mem. Umbel. 56, t.14. Froma 
few inches to three feet high: umbels 2 to 5-rayed ; umbel- 
lets few-flowered: involucre and involucels of few linear 
bracts, entire or divided: fruit 4 to 5 lines long; pericarp 
Wall thick and mostly made up of strengthening cells: sec- 
ondary ribs corky.—From Arkansas to Louisiana, Indian 
Territory and Texas. Fl. July. 
TUM Linn.—Fruit ovate to oblong, flattened laterally : 
Carpel with 5 corky primary ribs (each with a well-developed 
soup of strengthening cells at tip): oil-ducts 1 to 3 in the 
intervals (never solitary in all the intervals), 2 to 6 on com- 
mssural side, near center of pericarp: seed-section roundish 
or sub-angular : stylopodium depressed or wanting, with 
short Style (figs, 89-92).—Smooth perennials growing im 
4 Water or wet places, with pinnate leaves and serrate or pin— 
i natifid leaflets, involucre and involucels of several bracts, 
and white flowers, in summer. ee 
Appentham and Hooker refer our two species of Sium to 
7” ti, but to us they seem abundantly distinct, as also 1n- 
“icated by Watson, Bot. Calif. i. 261. The oil-ducts are 
on Solitary in all the intervals, and the prominent. Bait 
fare nethening cells in the outer edge of each rib sti 
rther emphasizes the distinction. There is no better de- 
