ORDEK LXI. IMBELLIFER.E. &37 



1. T. j&bx'se. (Xutt.) Stem glabrous. Leaves many-parted ; leaf- /"" 

 let* thin, those of the stem linear. Umbels opposite the leaves, 3 — 5 / ^ 

 rays. — White. 0. Lou. 2 feet. 



Tribe VIII.— DAUCIX'E^. 



Fruit with 5 primary bristly ribs and 4 more prominent sec- 

 ondary ones, prickly. Umbels compound. 



Gran XXII— CAUCUS. Tourn. 5—2, 

 (A. name given by Dioscorides.) 



Margin of the calyx 5-toothed. Petals obovate. emarginate, 

 with an indexed poiDt ; the exterior ones often larger and deep- 

 ly 2-cleft. Fruit compressed, ovate, or oblong. Carpels with 

 5 filiform, bristly ribs. Biennial plants, with pinnately divided 

 leaves. 



1. D. caro'ta, (L.) Root fusiform. Stem hispid branching. Leaves 

 2 — 3. pinnatifid ; segments pinnatifid, with lanceolate, cuspidate lobes. 

 Involucre consisting of pinnatifid leaves, about the length of the umbel 

 Umbels concave, the central one of each secondary one abortive. — Tel- 

 low. & . Naturalized. Carrot 



2. D. pusil'lus, (Mich.) Stem retrorsely hispid. Leaves bipinnate, 

 with pinnatifid segments, with narrow, linear lobes ; leaves of the in- 

 volucre bipinnatifid. Seeds muricate, with 8 crested ribs. — Greenish- 

 yellow. $ . May — July. Common in middle Geo. 1 — 2 feet 



Gexus XXIIL— CtUUROPHYL'LUM. L. 5—2. 

 (From the Greek chairo, to rejoice, andphuUon, a lea$ alluding to the smell of the leaf.) 



Limb of the calyx obsolete. Petals cordate, emarginate, 

 with an inflexed point. Fruit compressed. Carpels ribbed. 

 Seed convex. Leaves compound, with toothed or many-cleft 

 segments. Involucel many-leaved. 



1. C. procum'bens, (Lam.) Stem decumbent, glabrous, small Leaves 

 alternate, bipinnately divided; segments pinnatifid; divisions lanceo- 

 late, mucronate. Involucre none. Umbels usually sessile, opposite the 

 leaves, consisting of 2 — i rays; involucels 4 — 5-leaved. Fruit oblong, 

 striate, pointed at the summit — White. ©. April — May. Shady- 

 places. 6 — 18 inches. 



Gemts XXIV.-OSMORRHIZA. Raf. 5—2. 

 (From the Greek os-me, scent, and rhiza, a root) 



Margin of the calyx obsolete. Petals oblong, with an in- 

 curved, cuspidate point. Fruit long, alternate, smooth. Car- 

 pels ribbed. Seed terete. Perennial plants, with fusiform roots. 



1. O. BREvisTYLis, (D. C.) Stem pubescent when young, glabrous in 

 shady places, erect. Leaves biternate ; segments oblong, serrate, sprin- 



15 



