. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian. Botany. 656 AMMIACEAE. Vol. II. 47. SIUM [Tourn.] L. Sp. PL 251. 1753. Perennial marsh herbs, with simply pinnate stem-leaves, the lower and basal ones often pinnatisected, and compound large umbels of white flowers. Involucre and involucels of numerous narrow bracts. Calyx-teeth minute. Petals intlexed at the apex. Stylopodium depressed. Styles short. Fruit ovate or oval, so
. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian. Botany. 656 AMMIACEAE. Vol. II. 47. SIUM [Tourn.] L. Sp. PL 251. 1753. Perennial marsh herbs, with simply pinnate stem-leaves, the lower and basal ones often pinnatisected, and compound large umbels of white flowers. Involucre and involucels of numerous narrow bracts. Calyx-teeth minute. Petals intlexed at the apex. Stylopodium depressed. Styles short. Fruit ovate or oval, somewhat compressed. Carpels with promi- nent ribs; oil-tubes 1-3 in the intervals. Seed-face flat. [Greek name of a marsh plant.] About 8 species, natives of the north temperate zone and South Africa. The following are the only ones known to occur in the United States. Type species: Siiim latifolium L. Plant stout, 2°-6° high; leaf-segments 7-17. i. S. cicutaefolium. Plant weak, i°-3° high ; leaf-segments 3-7. 2. i'. Carsoni. I. Slum cicutaefolium Schrank. '^ Hemlock Water-Parsnip. Fig- 3171. Sium cicutaefolium Schrank, Bair. Fl. i: 558. Linn. Erect, stout, branched, 2°-6° high. Lower leaves long-petioled, the uppermost nearly sessile; petioles sheathing at the base; leaf-segments 7-17, linear, or lanceolate, li'-S' long, ij"-i2" wide, acuminate at the apex, sharply serrate, or the lowermost pectinately ' dissected; umbels 2-3' broad, 8-20-rayed; rays i'-i¥ long; fruit ovate, compressed, about li" long, the ribs promi- nent. In swamps. Nova Scotia to British Colum- bia, south to Florida, Louisiana and Califor- nia. Very variable in leaf-form. 2. Sium Carsoni Durand. Carson's Water-Parsnip. Fig. 3172. Sium Carsoni Durand ; A. Gray, Man. Ed. 5. 196. 1867. Stem slender, weak, i°-2° long. Leaf-seg- ments 3-7, those of the upper leaves linear, or lanceolate, acute, or acuminate, l'-2' long, i*"-3" wide, sharply serrate; lower leaves often
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