614 UMBELLIFER^. Zizia. 



segments 2-4 inches long and 1-2 inches wide, acute. Fruit one-third of an 

 inch long, dark olive when mature, with paler slightly prominent ribs, 

 crowned with the styles, which are about one-third the length of the carpels. 



16. ZIZIA. Koch, Umb. p. 129 ; DC. inodr. 4. p. 99. (excl. spec.) 

 Pentacrypta, Lehm. ? 



Margin of the calyx obsolete, or with 5 very short teeth. Petals oblong, 

 with a long inflexed point. Fruit contracted laterally, somewhat didymous, 

 roundish or oval. Carpels with 5 filiform more or less prominent (but not 

 winged) equal ribs ; the lateral ones marginal : intervals with 1-3 vittae. 

 Commissure with 2-4 vittaBi Carpophore 2-parted. Seed very convex on 

 the back, flat on the face. — Perennial (North American) herbs. Leaves 

 ternately or biternately divided; the segments oblong or ovate. Involucre 

 none. Involucels few-leaved. Flowers yellow. 



§ 1. Carpels with prominent ribs: intervals with single vittae: commissure 

 with 2 vitM. — EuziziA. 



1, Z. aurea (Koch) : segments of the leaves oblong-lanceolate, serrate; the 

 terminal one attenuate at the base. — DC. ! prodr. 4. p. 100 ; HooTc. ! ji. 

 Bor.-Am. I. p. 260; Dariingt.! ji. Cest. p. 185. Smyrnium aureum, 

 Linn. spec. 1. p. 262; Michx. ! fl. 1. p. 171; Ell. sk. 1. p. 359. Sison 

 aureus, Spreng. in Schvlt. syst. 6. p. 410 ; Torr. ! fl. 1. p. 305. 



Woods and'rocky hill-sides, Canada ! to Georgia! and Louisiana! May. 



Stem 1-2 feet high, branching towards the summit. Segments of the 



leaves 1-3 inches long ; the lateral ones abruptly narrowed at the base ; the 

 serratures with callous points. Umbel 10-15-rayed : partial rays 2-3 lines 

 in length. Involucels of 2-3 very small leaflets. Fruit elliptical, blackish 

 when'mature ; the ribs angularly elevated. — We have from Mr. Nuttall and 

 Mr. Schweinitz specimens of a Zizia (without fruit) from North Carolina, 

 which they suppose to be the Sison trifoliatum of Michaux, and which the 

 former botanist considers a distinct species (Z. trifoliata, Nutt. mss.) ; but we 

 cannot distinguish it from some forms of undoubted Z. aurea. The S. trifo- 

 liatum, Michx., according to his own herbarium, seems not to be distinct from 

 his Smyrnium aureum. 



§ 2. Carpels with slightly prominent ribs : intervals with-3 vittce : cominissure 

 with 4 vitt(S. — T^NiDiA. 



r 2. Z. integerrima (DC): segments of the leaves oblong-ovate, entire.— 

 DC. ! in mem. hist. nat. Gencv. 4, S^- jnodr. 4. p. 100 ; Dariingt. fl. Cest. p. 

 187. Smyrnium integerrimum, Linn. ! spec. 1. p. 263 ; Michx. ! I. c. ; 

 Ell. I c. ; Nutt. gen. 1. p. 195. Sison integerrhnus, Spreng. l. c. ; Torr. ! 

 fl. 1. p. 305. ^ . , » 



Rocky woods and hill-sides, Michigan ! New York ! to Georgia and Ar- 

 kansas ! May-June.— Plant glabrous and slightly glaucous, 1-2 feet high. 

 Leaves 2-3-ternately divided ; the segments about an inch long, sometimes, 

 especially the terminal one, 2-3-lobed. Umbels on slender peduncles; the 

 rays long and slender. Involucels minute, of 1-3 subulate leaflets. Calyx 

 minutely 5-toothed ; the teeth at length deciduous. Fruit roundish-ovate, 

 dark brown, nearly two lines long ; the ribs very slightly prominent except 



