. 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 102d meridian. Botany; Botany. Genus i. IRIS FAMILY. 539. 7. Iris prismatica Pursh. Narrow Blue-flag. Poison Flag-root. Iris virginica Muhl. Cat. 4. 1813. Not L. 1753. Iris prismatica Pursh, FI. Am. Sept. 30. 1814. Iris gracilis Bigel. Fl. Bost. 12. 1814. flris Carolina Radius, Schrift. Naturf. Ges. Leipzig I: 158. 1822. Rootstock rather slender, tuberous-thickened. Stems slender, often flex
. 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 102d meridian. Botany; Botany. Genus i. IRIS FAMILY. 539. 7. Iris prismatica Pursh. Narrow Blue-flag. Poison Flag-root. Iris virginica Muhl. Cat. 4. 1813. Not L. 1753. Iris prismatica Pursh, FI. Am. Sept. 30. 1814. Iris gracilis Bigel. Fl. Bost. 12. 1814. flris Carolina Radius, Schrift. Naturf. Ges. Leipzig I: 158. 1822. Rootstock rather slender, tuberous-thickened. Stems slender, often flexuous, i°-3° tall, usually- simple, bearing 2 or 3 leaves; leaves almost grass- like, ii"-2j" wide, mostly shorter than the stem; flowers solitary or 2 together, blue veined with yellow, slender-pedicelled; pedicels commonly longer than the bracts; outer perianth-segments 1J-2' long, glabrous and crestless, the inner smaller and nar- rower, the tube 2"-^" long above the ovary; capsule narrowly oblong, acute at each end, sharply 3-angled, i'-ii' long, 3"-4" thick; seeds about 1" broad, thick, borne in 1 row in each cavity. In wet grounds, Nova Scotia to Pennsylvania and Georgia, mainly near the coast. May-June. 8. Iris germanica L. Fleur-de-lis. Fig. 1335. Iris germanica L. Sp. PI. 38. 1753. Rootstock thick. Stems stout, usually branched and several-flowered, 2°-3° tall, bearing several leaves. Leaves glaucous, 8"-2' wide, the basal ones mostly shorter than the stem; bracts scarious; flowers nearly sessile in the bracts, large and very showy, deep violet- blue veined with yellow and brown or sometimes white; outer perianth-segments broadly obovate, 3'-4' long, their claws strongly crested; inner perianth-segments narrower, arching. Escaped from gardens to roadsides in Massachusetts and Virginia. Native of Europe. May-June. Iris Duerinckii Buckley, Am. Journ. Sci. 45: 176, de- scribed from specimens collected at St. Louis, Mo., but doubt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
