162 UMBEL LIFERS. (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 vittae. — 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. Uml>els 3-10-rayed; leaves of the involucre 

 mostly 3-5-eleft; fruit ovate. (Ammi capillaceum, Michx.) — Brackish marsh- 

 es, Florida to Mississippi, and northward. June and July. — Stem 1° -2° high, 

 much branched. Farliest leaves simple, or simply pinnate. 



2. D. COStata. Stem tall, branching above; leaves of the involucre 10- 

 12, many-parted ; fruit ovate, deeply sulcate. (Ammi costatum, Ell.) — Swamps 

 of the Ogcechec 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 2° - 6° 

 high. 



10. HELOSCIADIUM, Koch. 



Calyx-teeth 5, or obsolete. Fruit ovate or oblong, flattened on the sides, the 

 carpels equally 5-ribbed. Intervals with single vittae. Flowers white. 



1. H. nodiflorum, Koch. Stems prostrate or creeping ; leaves pinnate; 

 leaflets ovate-lanceolate, serrate ; umbels short-peduncled, opposite the leaves ; 

 involucre 1 - 2deaved or none; involucel 5-6-lcaved. (Sium nodiflorum,//.) 

 — Ditches, &e. around Charleston. Introduced. April -June. — Stems 2° 

 long. 



11. 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 vittae. — 

 Marsh or aquatic perennial herbs. Leaves pinnate; the immersed ones dissected 

 into numerous capillary divisions. Involucre several-leaved. 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, Toura. 



Calyx-teeth obsolete. Fruit flattened at the side-, or twin, ovate-oblong. 

 Carpels 5-ribbed, the intervals with or without vitt.x. — Smooth herbs, with en- 

 tire simple Leaves, and yellow flower-;. 



l. B. rotundifolium, L. Leaves ovate, perfoliate ; umbel f> - rayed ; in- 

 volucre none ; leaves of the. involucel ;">, ovate, mucronate. — Fields, North Caro- 

 lina. — Introduced. 



