162 IMBKI.LIFKU.E. (I'ARSLEY FAMILY.) 



9. DISCOPLEURA, DC. 



Calyx-tooth siilmlatc, iiorsistciit. Fruit ovate ; tlic carpels Ftroiifrly 3-riI)l»ocl 

 o!i tlic l)ai,k, ami with two lateral ribs united with a thick corky niaryin. Inter- 

 vals witli t^in^le vittiu. — Smooth annuals, j^rowin;^ in marshes Leaves pin- 

 nately dissected, witii the filiform divisions often whorled. Involucre and invo- 

 lueel conspicuous. Flowers white. 



1. D. capillacea, DC. Umhels .l - 1 0-raycd ; leaves of the involucre 

 mostly 3-.')-(Kt't ; fruit ovate. (Amnii cai)illa(eum, Michx.) — Brackish marsh- 

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

 much branched. Earliest leaves sim])lc, or simply pinnate. 



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

 12, many-parted ; fruit ovate, dccjjly sulcatc. ( Aninii costatum, Ell.) — Swamps 

 of the Og^eechee River, Georgia. October and November. — Stem 4° - h° high. 

 Fruit larger tlian in No. 1. 



3. D. Nuttallii, DC. Umbels many-rayed ; leaves of the involucre .') -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 cfjually 5-ribbed. Intervals with single vitta;. Flowers white. 



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

 leaflets ovate-lanceolate, serrate ; umbe.ls short-peduncled, opposite the leaves ; 

 involucre 1 -2-leaved or none; involucel 5-6-lcavt(l. (Slum nodiflorum,//.) 

 — Ditches, &c. 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 vittte. — 

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

 into numerous cajiillary divisions. Involucre several-leaved. Flowers white. 



1. S. lineare, Michx. Leaflets varying from linear to oblong, finely and 

 sharply serrati' ; calyx-teeth minute ; fruit globular, strongly ribbed. — Along 

 streams, commonly in water, Florida to JIississii)pi, and norilnvard. July. — 

 Stem 2° high. 



12. BUPLEURUM, Tourn. 



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

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

 tire simple leaves, and yellow flowers. 



1. B. rotundifolium, L. Leaves ovate, perfoliate ; umbel 5-rayed ; in- 

 volucre none ; leaves of the involucel 5, ovate, mucronate. — Fields, North Caro- 

 lina. — Introduced. 



