134 UMBELLIFER.E. 



obovate, ernarginate, with an inflexed point. Styles divergent- 

 reflexed, capitulate at the apex. Fruit compressed or con- 

 tracted at the side, subdidymous, crowned with the styles. 

 Carpels with equal filiform and somewhat obtuse ribs. Invo- 

 lucre many-leaved, rarely wanting. 



1. S. latifolium Linn. : root creeping; stem angular and sulcate ; leaves 

 pinnate ; leafets ovate-lanceolate, unequal at base, sessile, smooth, equally 

 serrate, sometimes pinnatifid ; umbels terminal, large, many-rayed ; invo- 

 lucres many-leaved. 



Swamps. Arct. Amer. to Perm. W. to Oregon. July. Q.Stem 24 feet 

 high, branching. Flowers white. When growing in water the lower leaves 

 are bi-pinnatifid, or have the leafets laciniate. Broad-leaved Water Parsnip. 



2. S. lineare Mich. : stem erect, smooth, angular and sulcate ; lower 

 leaves pinnate, upper ones ternate ; leafets linear-lanceolate or linear, 

 acutely and finely serrate ; umbel terminal, with short rays ; involucre 

 many-leaved, linear. S. ienuifolium Muhl. 



Swamps. Can. to Perm. W. to Oregon. July. 7}.. Stem. 2 5 feet high, 

 rather rigid. Leafets very long and narrow. Flowers white. 



Narrow-leaved Water Parsnip. 



11. BUPLEURUM. Linn. Hare's Ear. 



(From the Greek /?? , an ox, and irfovpov, a rib ; probably in allusion to the 

 ribbed leaves of some species.) 



Calyx with the margin obsolete. Petals roundish, entire, in- 

 volute. Fruit laterally compressed or subdidymous, crowned 

 with the depressed style. Carpels with 5 winged acute fili- 

 form or obsolete ribs ; lateral ones marginal. Leaves mostly 

 simple. Involucre various. 



B. rotundifolium Linn. : stem leaves perfoliate, roundish-ovate ; umbel 

 5-rayed ; general involucre none ; partial one of 5 mucronate leafets. B 

 perfoliatum Lam. 



Near cultivated grounds. N. Y. Penn. toN. Car. June Aug. () Stem 1 2 

 feet high, branching. Leaves perforated by the stem. Flowers greenish-yellow 



Common Hare's Ear. Thorough Wajr 



12. ^ETHUSA. Linn. Fool's Parsley. 



(From the Greek aiQw, to burn ; on account of its acrid quality.) 



Calyx with the margin obsolete. Petals obovate, emargi- 

 nate, with an inflexed point. Fruit ovate-globose. Carpels 

 with 5 elevated, thick and acutely keeled ribs ; the lateral ones 

 margined and a little broader, and surrounded by a somewhat 

 winged keel. General involucre none or 1 -leaved ; partial one 

 1 3 or 5 leaved. 



^E. Cynapium Linn. : leaves bi- and tri-pinnate. dark gre^n ; segments 

 ovate-lanceolate: partial involucre of 3 Ion<x pendant l-avt's. 



