178 UMltKLLIFEK.i:. (tAKSLKV FAMILY.) 



marsh herbs, with hollow stems, and twice jiiuiiately or teriiately divided 

 leaves. Iiivohuels iiiaiiv-leaved. Plowers white. 



1. C. maculata, !>• stem larj^e (.3°-G° hijjli), jmrplish ; leaflets ovate- 

 lanceolate, aciite, coarsely serrate ; umbels large, many-rayed. — Marshes and 

 river banks. July. — Plant very poisonous. 



8. APIUM, L. 



Calyx teeth .5, or obsolete. Fruit ovale or ol)lonp;, flattened on the sides, 

 the carjjols c(pially 5-ribbed. lutervals witli single vitta;. Flowers white. 



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

 leaflets ovate-lanceolate, serrate ; uml)els short-j)eduiicled, opposite the leaves; 

 involucre 1-2-leaved or none; invohuel .'J-6-leaved. — Ditches, etc. around 

 Charleston. Introduced. A])ril- June. — Stems 2° long. 



2. H. leptophyllum, DC. .Stem erect or diffuse; leaves ternately or 

 bitern;itely divided, the divisions linear or setaceous; umbels nearly se.ssile, 

 1-3-rayed; involucre and involucel none; fruit ovate. — Ea.st Florida, and 

 westward. Introduced. — Stem i° - 2° high. Fruit very small. 



9. LEPTOCAULIS, Nutt. 



Calyx teeth obsolete. Fruit ovate, comj)ressed on tlie sides, often rough or 

 bristly. Carpels S-ribbed, the intervals witli single vittae, and 2 on the face. 

 — Slender smootli hei-bs, with finely dissected leaves, and white flowers. 

 Umbels few-raved. Involucre none. Involucel few-leaved. 



1. L. divarioatUS, DC. Annual ; stem (6'- 18' high) widely branched ; 

 leaves 2-.3-]iiiniatifid, with the divisions filiform ; uml)el ,3-4-rayed. (Sison 

 pusillum, Micli.r.) — Dry sandy soil, Florida to North Carolina. April. — 

 Fruit very small, roughened with minute scales. 



2. L. echinatus, Nutt. Leaves, etc. as in tlie preceding, but the fruit 

 beset with rigid spreading hooked bristles. — Mol)ik' (Mohr), and westward. 



10. 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. 

 Intervals with single vittaj. — Smooth annuals, growing in marshes. Leaves 

 pinnately dissected, with the filiform divisions often whorled. Involucre and 

 involucel conspicuous. Flowers white. 



1. D. capillacea, DC. Umbels 3-IO-r.ayed; leaves of the^ involucre 

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

 marshes, Florida to Mississippi, and northward. June-July. — Stem l°-2° 

 high, much branched. Earliest leaves simple, or simply pinnate. 



2. D. Nuttallii, DC. LTmbels many-rayed ; leaves of the involucre .5-6, 

 entire ; fruit globose. — Low ground, Florida, Georgia, and westward. — Stem 

 2° - 6° high. 



