142 DICOTYLEDONOUS PLANTS. 



HAH. Woods. Throughout the U. S. June, Aug. If. Stem, 

 2 feet high, erect, smooth. Flowers greenih-white. Var. b. is 

 found, according to Mr. Brace, at Litchfield, Conn. 



5. ERYNGIUM. Linn. 



Calyx 5-parted ; tube rough with scales. Petals erect, 

 connivent, oblong-obovate, deeply eraarginate. Fruit Scaly 

 or tuberculose. Flowers in a roundish or oblong head. Low- 

 er bracts often large and resembling an involucre ; the rest 

 (chaff,) mixed with the flowers. Pentandria. Digynia. 



1. E. aquaticum Linn. : leaves linear-lanceolate, nerved, remotely 

 ciliate-spinose ; lower ones subensiform ; those of the flowers lanceo- 

 late, dentate; flowers in ovate heads, at the extremities of the branches; 

 leafets of the involucre 89, shorter than the head and with the chaff 

 entire. E. yuccocfolium Mich. 



HAB. Wet grounds. N. J.? to Geor. Aug. U- Stem 2 3 

 feet high, smooth, dichotomous above. Flowers white or pale 

 blue. Leaves 1218 inches long. Medicinal. See EU. Sk. i. 

 343. Button Snake-root. 



2. E. virginianum Lam. : leaves long-lanceolate, serrate, tapering at 

 each end ; flowers in large terminal umbels or corymbs ; leafets of the 

 involucre 7 8, longer than the heads, laciniate, subulate, whitish be- 

 neath ; ehafF3-clefl. E. aquaticum Mich. 



HAB. Marshes. N. J. to Geor. July, Aug. U.Stem 34 

 feet high, hollow. Leaves 6 8 inches long. Flowers pale blue 

 or white. 



3. E. virgatum Lam. : leaves spatulate-ovate, irregularly toothed, 

 short pctioled, sometimes a little cordate ; heads of flowers small, pe- 

 dunculate, shorter than the linear leafets of the involucre ; chaff 3-cleft. 

 E. ovalifolium Mich. EU. 



HAB. Wet meadows. N. J. to Geor. July. 2J..Stem 23 

 feet high, simple, branching above. Leaves about 2 inches long. 

 Flowers blue, in small heads. 



** Umbels compound or perfect. 

 6. CICUTA. Linn. 



Calyx with the margin 5-toothed. Petals obcordate, reflex- 

 ed. Fruit roundish, didymous, laterally contracted. Carpels 

 with 5 equal flattish ribs ; the lateral ribs margined. Gene- 

 ral involucre none or few-leaved ; partial one many leaved. 

 Flowers white. Pentandria. Digynia. 



1. C. maculata Linn. : stem spotted ; lower leaves triternate and 

 quinate; upper biternate ; segments lanceolate or ovate-lanceolate, 

 acuminate, mucronately serrate ; umbels large, axillary and terminal ; 

 partial involucre of 5 6 setaceous leaves. 



