616 UMBELLIFER^. CEna.nthe. 



with 2 conspicuous vitt;e. — The two varieties of this plant are generally con- 

 sidered as distinct species, and have even been referred to different genera 

 by many botanists ; but a careful examination has convinced us that they 

 scarcely differ except in the color of the flowers. The specific name of 

 Linnaeus is so inapplicable tbat we have thought it inexpedient to substitute 

 it for the very appropriate one given by Walter, which has been generally 

 employed. 



-'^'^2. T. aureum (Nutt.) : stem "rlabrous at the nodes ; leaves all bitemately 

 ' divided ; segments oblong-lanceolate, cuneate at the base, dentate-serrate ; 

 the margin of the serratures cartilaginous ; carpels with the winged ribs near- 

 ly equal. — Nutt. gen. 1. |?. 196. (excl. syn. ?) 



Pennsylvania ? Springfield, Ohio, Mr. T. G. Lea ! — Plant apparently 

 3-4 feet high, glabrous. Stem branching, finely sulcate. Cauline leaves on 

 short petioles; the segments somewhat rhombic-lanceolate, 2-2^ inches 

 long; the lateral ones sessile; the terminal one on a long petiolule. Princi- 

 ]ml umbel of about 10 rays; the rays ^n inch or more in lenglh. Involucel 

 of 2-3 short setaceous leaflets, or none. Fruit about li line long: all the 

 ribs conspicuously winged. — This species agrees minutely with the descrip- 

 tion of Nuttall's T. aureum (the locality of which is not given), and more- 

 over appears to be a genuine Thaspium. It is probably rare, as we have 

 only received it from a single locality. 



-^' 3. T. harhinode (Nutt.) : stem pubescent at the nodes ; leaves 2-3-ter- 

 ' nately compound ; segments cuneate-ovate, unequally and incisely serrate, 

 entire at the base ; fruit elliptical or ovate ; the 3 dorsal wings usually alter- 

 nately narrower. — Nutt.! gen. 1. p. 196; DC! j^rodr. 4. p. 154; Dar- 

 lingt.fi. Cest. p. 192. Ligusticum barbinode, Miclix. ! fi. 1. p. 167 ; Pursh, 

 fl. l.p. 193. Thapsia trifoliata, {Mill.?) Spreng. iri Schult. syst. 6. p. 615 ; 

 Torr. fl. 1. p. 317. Apii species fl. luteis, Gronov.! Virg. ed. 1. 

 /?. leaflets small ; fruit narrowly and equally winged. 

 Banks of rivers, Chippewa, Upper Canada ! to Georgia ! Kentucky ! 

 and Arkansas ! Florida, Dr. Chapman. ! June. — Plant yellowish-green. 

 Stem about 2 feet high, branching above ; the nodes and base of the 

 petioles usually more pubescent. Leaves mostly bilernately divided ; the 

 upper ones usually opposite : segments 1-2 inches long, (in li. about half an 

 inch) ; the base, particularly of the terminal one, more or less cuneate, but 

 sometimes obtuse. Umbels terminal (alar) as well as opposite the upper 

 leaves, on peduncles 1-3 inches long : rays half an inch in length. Involucre 

 usually wanting, but sometimes of 1-2 linear leaflets : involucels 3-4-leaved. 

 Flowers deep yellow. Styles nearly erect, as long as the ovary. Fruit 2-3 

 lines long : one of the carpels usually with only the dorsal and the marginal 

 ribs strongly winged ; the other with the two intermediate and the marginal 

 ribs winged : sometimes, however, all the ribs are equally winged. 



18. CENANTHE. Linn, (partly) ; Lam. ill. t. 203 ; DC. prodr. 4. p. 136. 



CEnanthe & Phellandriuni, Linn. 



Calyx-teeth lanceolate. Petals obcordate, with an inflexed point. Fruit 

 cylindrical-ovate, crowned with the straight styles. Carpels more or less 

 corky, with 6 convex obtuse ribs ; the lateral ones marginal and broader. In- 

 tervals with single vittse. Carpophore indistinct. — Glabrous herbs. Involucre 

 various, often none. Involucels many -leaved. Flowers wliite ; those of the 

 circumference sterile and on long pedicels ; the central ones sessile or near- 

 ly so, and fertile. 



