UMBELLIFEB.^. 133 



petioles ; cauline subsessile, ternate ; segments petiolate, ovate or ovate~ 

 oblong, serrate ; partial involucre 1 2-leaved. Smyrnium cor datum Walt. 

 Meadows. Can. to Flor. W. to Miss. May, June. %. Stem 1218 inches 

 high, smooth. Radical leaves sometimes a little lobed. Umbels on long naked 

 peduncles. Flowers yellow. Fruit black. Heart-leaved Alexanders. 



3. Z. integerrima D. C. : leaves bi-ternate, somewhat glaucous ; seg- 

 ments oblong-ovate, entire ; partial involucre 1-leaved, very short. Smyr- 

 nium integerrimum Linn. 



Rocky woods. Can. to Geor. W. to Miss. May, June. %. Stem 1 2 feet 

 high. Um?)cl with elongated filiform rays. Flowers yellow. Fruit dark brown. 



Entire-leaved Zizia. 



8. DISCOPLEURA. D. C. Discopleura. 



(From the Greek <Wo?, a disk, and v\svpa : the side; the two sides of the fruit 

 being marked with a kind of disk.) 



Calyx with 5 subulate persistent teeth. Petals ovate, entire. 

 Fruit ovate, subdidymous. Carpels with 5 ribs ; 3 dorsal ribs 

 filiform, exsert, subacute ; 2 lateral ones with a thick margin. 

 Leaves much divided ; the segments linear. Partial involucre 

 a few linear setaceous leafets. 



D. capillacea D. C. : stem erect or procumbent ; umbels 3 12-rayed ; 

 leafets of the involucre 3 5, mostly 3-cleft ; fruit ovate. Ammi majus 

 Walt. A. capillaceum Mich. 



Bogs. N. Y. to Geor. July Sept. ([). Stem 12 feet long, geniculate, 

 smooth. Leaves many-parted, with the segments filiform and spreading. F low- 

 ers very small, white, on axillary umbels. Few-rayed Discopleura. 



9. CRYPTOT.ENIA. Z>. C. Hone-wort. 



(From the Greek *pv;rrdj, hidden, and raivta, inflict ; the narrow vittae being 

 concealed in the carpels.) 



Calyx with the margin obsolete. Petals obovate, subentire, 

 with a narrow inflexed point. Fruit laterally contracted, linear- 

 oblong, crowned with straight styles. Carpels with 5 equal 

 filiform obtuse ribs ; the lateral ones nearly margined. Um- 

 bels numerous, arranged somewhat in the form of a panicle. 

 General involucre none ; partial one few-leaved. 



C. Canadensis D. C. : leaves ternate, smooth ; leafets rhomboid-ovate or 

 lanceolate, acute, incisely toothed, acutely serrate ; umbels numerous, lower 

 ones rising from the axils of the upper leaves ; fruit oblong, beaked with the 

 persistent styles. Sison Canadense Linn. CK&rophyllum Canadensc Pers. 



Rockv Woods. Can. to Geor. W. to Miss. June Aug. %. Stem about 2 

 feet high, branched above. Leaves sometimes quinate ; the lower ones on long 

 petioles. Flowers white. Canadian Hone-wort, 



10. SIUM. Linn. Water Parsnip. 



(From the Celtic siw, water ; in allusion to its place of growth.; 

 Calyx with the margin 5-toothed, often obsolete. Petals 



