.vcus. PENTANDRIA. DIGYNIA. 309 



R«ot biennial. Stem 2 feet high, erect, sulcate. Leaves pale 

 green ; segments linear or linear-lanceulate, cuspidate. Uni- 

 versal and partial involucra pinnatifid, with linear divisions. 

 Umbel concave when in fruit. Flowers vi^hite. 



Hab. In old fields. June — August. Naturalized. Wild Carrot, 



207. MYRRHIS. M orison. 



Fruit pyramidal, rostrate, crowned with the pistils ; 

 ribs 5, acute. Involucrum 0. Ro e m. ^ Sc hiilt. 

 Gen. 1204. Urospermum and Myrrhis Nutt. 

 Gen. I. p. 192. 



t."^. procumhens S p r eng. : stem procumbent, some- 

 what hairy; leaves bipinnate; segments lanceolate, rather 

 obtuse; umbels 3-rayed, few-flowered ; fruit smooth. Spreng. 

 Umb. Spec. \).\30. R o em. &i Sc hu 1 1. Wl. i^. 5l6, Scan- 

 mK prociimbens L. JVilld. 6]oec. J. p. 1452. Mukl. Cat, 

 p. 31. Ch5;rophyllum procumbens Lam, Enc. I. p. 685. 

 Per s. Syn. 1. p. 320. Pursh /'Z. I. p. 19 5. Elliott 

 Sk: I, ^. 257, Nutt. Gen„ I. p. 279. Scandix seminibus 

 nitidis Gron, Firg. p. 147. 



Root annual. Stem 6 — 8 inches long, slender, branched, a little 

 hairy, particularly on the sheaths. Leaves pinnatifid, decom- 

 pound; segments slightly ciliate. Umbels terminal, about 

 3-rayed ; partial umbels 4 — 5-flowered. Universal involu- 

 crum wanting ; partial 4 — 5-leaved, ovate, ciliate. Flowers all 

 fertile. Calyx 5-toothed. Corolla white ; fietals oblong, 

 slightly inflexed. Fruit linear-oblong, prismatic, crowned 

 with the persistent styles ; intervals angularly elevated.. 



Hab. In sl)ady rocky situations. New-Jersey. On the banks 

 of the Schuylkill, near Philadelphia. A'u 1 1 a 1 1. In Mary- 

 land, near Hagers-town. Pursh. May. 



2. M. Clayioni M i c h. : stem hairy (at first hoary-white) ; 

 leaves biternate, pubescent ; leaflets incisely lobed, dentate ; 

 umbel 3-rayed ; central flowers abortive ; universal and par- 

 tial involucra 3 — 5-leaved, lanceolate, ciliate ; fruit attenuate 

 at the base, with hispid angles, not rostrate ; styles very short. 

 M ich. FL I. p. 170. Spreng. Umb. Spec. p. I2"9. (. 3. 

 f. G. Ro em. &L S chult. VI. p. 508. Ch^rofhyllum 

 Claytoni Pers. Syyi. I. p. 320. Pursh Fl. I. p. 195. 

 Elliott Sk. I. p. 368, Scandix dulcis Muhl. Cat. p. 

 31. Urospermum C/w^/07W JV Mi f. Gen. I. p. 193. Myrrhis 

 foliis trilobatis Gron. Virg. p. 148, Cerefolium latifolium 

 canadense Moris. Sect. IX. t. 11. 



Root perennial, fusiform, slender. Stem about 2 feet high, hairy, 

 particularly on the upper part, when young, as well as the pe- 



