UMBELLIFERiE. 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 12—18 inches 

 hi«^h, smooth. Radical leaves sometimes a little lobed, UmheU 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-leayed, very short. Smyr- 

 nium integerrimum Linn. 



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

 hit^h. Umbel with elongated filiform rays. Flowers yellow. Fruit dark brovm. 



° Entire-leaved Zizia. 



8. DISCOPLEURA. D. C— Discopleura. 



(From the Greek SirrKOi, a disk, and irXsvpa, 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. Q.—Stem 1—2 feet long, geniculate, 

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

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



9. CRYPTOT^NIA. D. C— Hone-wort. 



(From the Greek upvirrds, hidden, and Taivca, a. fillet ; 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. Charophyllum Canadense Pers. 



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

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

 petioles. FZoujers white. . Canadian Hone-wort. 



10. SIUM. I/mw.— Water Parsnip. 

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

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



