162 UMBELLIFERJE. (PARSLEY FAMILY.) 
9. DISCOPLEURA, DC. 
Calyx-teeth subulate, persistent. Fruit ovate; the carpels strongly 3-ribbed 
on the back, and with two lateral ribs united with a thick corky margin. Inter- 
vals with single vittee. — Smooth annuals, growing in marshes. Leaves pin- - 
nately dissected, with the filiform divisions often whorled. Involucre and invo- 
lucel conspicuous. Flowers white. 
1. D. capillacea, DC. Umbels 3-10-rayed ; leaves of the involucre 
mostly 3—5-cleft; fruit ovate. (Ammi capillaceum, Michx.) — Brackish marsh- 
es, Florida to Mississippi, and northward. June and July. — Stem 19 - 29 high, 
much branched. Earliest leaves simple, or simply pinnate. 
2. D. eostata. Stem tall, branching above; leaves of the iuvolutie 10- 
12, many-parted ; fruit ovate, deeply sulcate. (Ammi costatum, Ell.) — Swamps 
of the Ogeechee River, Georgia. October and November. — Stem 4° - 5° high. 
Fruit larger than in No. 1. > : 
3. D. Nuttallii, DC. Umbels many-rayed ; leaves of the involucre 5-6, 
entire ; fruit globose. — Tampa Bay, Florida, and westward. — Stem 29-6? 
uk 
10. HELOSCIADIUM, Koch. 
Calyx-teeth 5, or obsolete. Fruit ovate or oblong, flattened on the sides, the 
carpels equally 5-ribbed. Intervals with single vittze. Flowers white. 
1. H. nodiflorum, Koch. Stems prostrate or creeping ; leaves pinnate; 
leaflets ovate-lanceolate, serrate; umbels short-peduncled, opposite the leaves; 
involucre 1 -2-leaved or none; involucel 5—-6-leaved. (Sium nodiflorum, L.) 
— Ditches, &c. around Charleston. Introduced. April - June. — Stems 2? 
long. : 
ll. SIUM, L. 
Calyx-teeth small or obsolete. Fruit ovate or globular, flattened at the sides; 
the carpels with 5 equal corky ribs. Intervals usually with several vittæ. — 7 
Marsh or aquatic perennial herbs. Leaves pinnate; the immersed ones dissected ' — 
into numerous capillary divisions. Involucre severalleaved. Flowers white. 
1. S. lineare, Michx. Leaflets varying from linear to oblong, finely and 
sharply serrate ; calyx-teeth minute; fruit globular, strongly ribbed. — Along 
streams, commonly in water, Florida to Mississippi, and northward. July-— 
Stem 2° high, 
12. BUPLEURUM, Toum. 
Calyx-teeth obsolete. Fruit flattened at the sides, or twin, ovate-oblong- 
Carpels 5-ribbed, the intervals with or without vittæ. — Smooth herbs, with em 
tire simple bond and yellow flowers. 
, L. Teti perfoliate ; umbel TN iw 
