172 UMBELLIFERJE. [Sisox. 



11. SI SON, L. 



Characters of Ca'rum, but vittse very short, often obscure, occupying 

 only the upper half of the fruit. DISTEIB. West Europe, Italy, and the 

 East ; 2 species. ETYM. unknown. 



S. Amo'xnuin, L. ; leaves pinnate or 2-pinnate below, upper smaller 



3-lobed toothed or entire. 



Moist places, hedgebanks, &c., from York and Chester southd., rare in 1ST. 

 England; (a native? Wats.)] Channel Islands; fl. Aug.-Sept. Biennial, 

 glabrous, nauseous-smelling. Root fusiform. Stem 2-3 ft., erect, branched, 

 slender, leafy, solid. Leaves 6-12 in., deltoid-oblong, leaflets 1-3 in., shortly 

 petioled, linear-oblong or ovate, base cuneate. Umbels terminal and axillary, 

 compound ; rays few, slender, unequal ; bracts and bracteoles 2-4, short, 

 subulate, rarely 0. Flowers minute, white. Petals broadly obcordate, notch 

 deep, point long inflexed. Fruit ovoid or subglobose ; ridges strong ; vittre 

 very short, narrowed upwards ; styles short, recurved ; disk-lobes thick 

 depressed. -DISTRIB. of the genus. -Closely resembles Ca'rum seye'tum. 



12. CICU'TA, L. WATER-HEMLOCK, COWBANE. 



Tall, perennial, glabrous herbs. Leaves pinnate or decompound. Um- 

 bels compound, many-rayed ; bracts few or ; bracteoles many, small ; 

 flowers white. Calyx-teeth acute. Petals with an inflexed point. Di*k- 

 lobes depressed, entire. Fruit orbicular or broadly ovoid, constricted at 

 the commissure, didymous, carpophore 2-partite ; carpels slightly com- 

 pressed, primary ridges thick broad flat ; vittse solitary in the furrows. 

 Seeds slightly convex ventrally. DISTRIB. Marshes of the N. hemisphere ; 

 species 3. ETYM. A Latin name of the Hemlock. 



C. viro'sa, L. ; root fibrous, leaflets lanceolate doubly serrate. 

 Watery places, from Dumbarton and Forfar to Suffolk and Somerset ; Ireland ; 

 Channel Islands; fl. July- Aug. Rootstock short, stout, hollow, septate. 

 Stem 2-4 ft., stout, leafy, furrowed. Leaves large, deltoid, 2-3-piunate ; 

 petiole stout ; leaflets 2-4 in., oblique. Umbels terminal and leaf-opposed, 

 3-5 in. L diam., long-peduncled, flat-topped, rays long slender; bracts 0; 

 bracteoles many, short, slender. Flowers minute. Calyx-teeth ovate. Fruit 

 T V in. broad, broader than long ; styles slender, recurved. DISTRIB. 

 N. and Mid. Europe (Arctic), N. Asia, Himalaya. 



13. SI'UM, L. WATER-PARSNIP. 



Glabrous herbs. Leaves pinnate ; leaflets toothed. Umbels compound, 

 terminal or lateral ; bracts and bracteoles many ; flowers white. Calyx- 

 teeth acute. Petals with an inflexed point. Disk-lobes thick, conical or 

 depressed. Fruit ovoid or oblong, laterally compressed or constricted at 

 the commissure, carpophore undivided ; carpels 5-angled, primary ridges 

 equal prominent obtuse or thickened, lateral next the commissure ; vittae 

 many, in the furrows. Seed subterete. DISTRIB. N. temp, regions, 

 S. Africa; species 4. ETYM. unknown. 



