334 ORDER LXI. UMBELLIFER^E. 



the base, serrulate, glabrous. Umbel 10 — 15-rayed; involucel of 2 — 3 

 very small leaflets. Fruit elliptical, nearly black when mature. — Yel- 

 low. %. May. Common. 1—2 feet. 



2. Z. integer' rima, (D. C.) Stem glabrous and slightly glaucous. 

 Leaves 2 — 3, ternately divided ; terminal leaflet usually 2 — 3-lobed ; 

 segments oblong-ovate, entire. Umbels on slender peduncles, with 

 long, slender rays. Involucels of 1 — 3 subulate leaflets. Fruit round- 

 ish-ovate with prominent ribs. — Yellow. %. May — June. Common. 

 1—2 feet. 



Tribe IV.— SESELIN'EJS. 



Umbels compound. Fruit with primary ribs only ; trans- 

 verse section orbicular. 



Genus XIII.— THAS'PIUM. Nutt. 5—2. 

 (From the Isle of Thaspia.) 



Limb of the calyx toothed or nearly obsolete. Petals ellip- 

 tical, with an attenuated, inflexed point. Fruit elliptical. Car- 

 pels convex, ribbed. Seed nearly terete. Perennial plants, 

 with ternate or biternate leaves. Flowers in terminal umbels 

 or opposite the leaves. Involucre none ; involucels lateral, 3- 

 leaved. 



1. T. corda'tum, (T. &l G.) Stem terete, usually glabrous. Radical 

 leaves nearly orbicular, cordate, toothed ; cauline ones ternate; seg- 

 ments ovate, serrate. Carpels with winged ribs. — Yellowish, white, or 

 purple. If. May — June. On high lands. 1 — 2 feet. 



Smyrnium cor datum, Walt. 



2. T. barbino'de, (Nutt.) Stem pubescent at the nodes. Leaves biter- 

 nate or triternate ; segments cuneate, ovate, unequally serrate. Umbels 

 terminal and opposite to the leaves. Fruit elliptical or ovate, some of 

 the ribs only winged. — Deep yellow. If. June. Banks of rivers. 1 

 —2 feet. 



Genus XIV.— CYNOSCIA'DIUM. D. C. 5—2. 



(From the Greek kuon, a dog, and skiadion, an umbel.) 



Calyx with subulate teeth, persistent. Petals ovate or nearly 

 orbicular, entire. Fruit ovate ; carpels with 5 thick ribs. 



1. C. digita'tum, (D. C.) Stem, angular, slender. Leaves digitate; 

 lower ones 5-parted ; upper ones 3-parted ; radical ones often entire. 

 Petals ovate, with an inflexed point. Fruit contracted toward the 

 summit. — White. 0. Louisiana. 



Genus XV— LIGUS'TICUM. L. 5—2. 

 (From Liguria, in which one of the species grows abundantly.) 



Limb of the calyx toothed or obsolete. Petals ungniculate, 

 obovate, emarginate, with an inflexed point. Fruit slightly 

 compressed or nearly terete. Carpels ribbed, somewhat winged. 



