334: ORDER LXI.— UMBELLIFEEiE. 



the base, serrulate, glabrous. Umbel 10 — 15-rayed; invoIucelof2 — 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'E^. 



HI 1 

 Umbels compound. Fruit with priinarj ribs only 7 trans- 

 verse section orbicular. #• 



Genus XIIL— THASTIUM. JTutt. 6— 2. * 



(From the Isle of Thaspia.) 



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

 tical, with an attenuated, iuflexed 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. &, 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.) jS'^gwt pubescent at the nodes. Leaves biter- 

 nate or triternate ; segments cuneate, ovate, unequally serrate. U7nbels 

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

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

 —2 feet. 



Genl-s XIV.— CYXOSCIA'DIUM. D. C. 5—2. 



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



Cahjx 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, ©. 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 unguiculate, 

 obovate, emarginate, with an inflexed point. Fruit slightly 

 compressed or nearly terete. Carpels ribbed, somewhat winged. 



