UMBELLIFERZ. (PARSLEY FAMILY.) 165 
1. T. teretifolia, DC. (Sium teretifolium, Ell.) — Pine-barren swamps, 
Florida to North Carolina, and westward. August. — Stem 2°-4° high. Peti- 
oles with cross partitions. 
*. 
20. ARCHEMORA, DC. 
Calyx 5-toothed. Fruit oval or obovate, flattened on the back. Carpels with 
5 slender obtuse ribs, winged on the margins. Intervals with single vitte, and 
4-6 on the commissure. — Smooth herbs, with pinnately-divided leaves, and 
white flowers. Involucre few-leaved or none. Involucel many-leaved. 
l. A. rigida, DC. Leaves pinnate; the leaflets (3-9) varying from lin- , 
ear to oblong, variously toothed or entire. (Sium rigidus, tricuspidatum, and 
denticulatum, EX.) — Swamps, Florida to Mississippi, and Fame. Angust 
and September. — Stem 29 — 5? high. 
2. A. ternata, Nutt. Leaves ternate, with the leaflets linear, entire and 
strongly nerved ; the lowest ones on very long petioles. (Neurophyllum longi- 
folium, Torr. & Gray.) — Low or swampy pine barrens, Florida to North Caro- 
lina. November. — Stem slender, 29 high. Petioles of the lower leaves 19 or 
more long. Root bearing tubers. 
21. HERACLEUM, L. 
Calyx-teeth minute. Fruit oval, flat. Carpels with the 2 lateral ribs distant 
from the 3 dorsal ones, and near the dilated margins. Vittæ shorter than the 
carpels, single in the intervals, and usually 2 on the commissure. — Stout per- 
ennial herbs, with pinnately or ternately divided or lobed leaves on inflated peti- 
oles, and white flowers. Involucre few-leaved. Involucel many-leayed. Mar- 
ginal flowers commonly larger and radiant. 
1. H. lanatum, Michx.  Villous; leaves very large, ternate; leaflets 
broadly cordate, deeply lobed, hoary beneath. — Mountains of North Carolina. 
June. — Stem 49 — 8? high, strongly furrowed. 
22. CHHROPHYLLUM, L. 
Calyx-teeth obsolete. Fruit oblong or linear, tapering at the apex, contracted 
at the sides. Carpels deeply furrowed on the commissure, with 5 obtuse equal 
ribs. Intervals with single vittæ. — Herbs, with compound finely dissected leaves, 
and white flowers. Involucre few-leaved or none. Involucel many-leaved. 
1. C. procumbens, Lam. Stem weak, slightly pubescent; leaves ter- 
nately divided ; the divisions bipinnatifid, with oblong obtuse lobes ; umbel 
sessile, of 2-3 long rays; involucel 4— 5-leaved, few-flowered ; fruit oblong, 
abruptly pointed, finely ribbed. — Shady river-banks, Mississippi to North — 
lina, and northward. April and May. @ or @ — Stem 6'-18' long — — 
