ORDER LXI. UMBKLLIFEU.E. 837 



1. T, ^THu'sE, (Nutt.) Stem glabrous. Leaves niany-parted ; leaf- 

 lets thin, those of the stem linear. Umbels opposite the leaves, 3 — 5 

 rays. — White. 0. Lou. 2 feet. 



Tribe VIII.— DAUCIN'E^. 



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

 ondary ones, prickly. Umbels compound. 



Genus XXII.— DAU'CUS. Tourn. 5—2. 

 (A name given by Dioscorides.) 



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

 with an inflexed point ; 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. caeo'ta, (L.) Root fusiform. Stem hispid, branching. Leaves 

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

 Lnvolncre consisting of pinnatifid leaves, about the length of the umbel. 

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

 low. S . Naturalized. Carrot 



2. D. pusil'lus, (Mich.) Steyn 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. S . May — July. Common in middle Geo. 1 — 2 feet. 



Genus XXIIL— CHJSROPHYL'LUM. L. 5—2. 

 (From the Greek chairo, to rejoice, and j^huUon, alenf, alluding to tbc smell of tlie 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, ghibrous, small. Leaves 

 alternate, bipinnately divided ; segments pinnatifid ; divisions lanceo- 

 late, mucroiiate. 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. 0. April — May. Shady 

 places. 6 — 18 inches. 



Genus XXIV.-OSMORRHI'ZA. Raf. 6—2. 

 (From the Greek osme, scent, and rJdza, 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. brevistt'lis, (D. C.) Stem pubescent when young, glabrous in 

 shady plac*»s, erect. Lenvr.i liiternate ; segments obl<ing, sorrnte, sprin- 



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