. 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 . 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 floating and very thin, the segments broader and laciniate, or dissect
. 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 . 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 floating and very thin, the segments broader and laciniate, or dissected; umbels l'-2' broad, 7-15-rayed; rays 6"-i2" long in fruit; fruit somewhat smaller than that of the preceding species. In streams, Maine, Massachusetts and Rhode Island to Pennsylvania. Perhaps an aquatic race of Sium ciculaefolium, but appearing distinct in Pennsylvania. July-Aug. 48. PTILIMNIUM Raf. Neog. 2. 1825. [ DC. Mem. Omb. 38. 1829] Annual erect glabrous branching herbs, with pinnately or ternately dissected leaves, and cotnpound umbels of white flowers. Bracts of the involucre several, filiform or dissected in our species. Involucels present. Calyx-teeth obsolete. Petals obovate, the apex inflexed. Stylopodium conic; fruit ovate, slightly compressed, glabrous. Carpels dorsally compressed, the dorsal and intermediate ribs prominent, slender, the lateral ones very thick and corky; oil-tubes solitary in the intervals. Seed-face flat. [Greek, referring to the finely divided leaves.] About 4 species. Besides the following, another occurs in Texas and one in the East Indies.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
