. 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 . About 10 species, of wide geographic distribution in the Old World, the following naturalized from Europe as a weed. Type species : Scleranthus annutis L. I. Scleranthus annuus L. Knawel. German Knotgrass. Fig. 1725. Scleranthus annuus L. Sp. PI. 406. 1753. Much branched from long and rather tough roots, the branches prostrate or spreading, 3-5' long, roughish- puberulent or
. 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 . About 10 species, of wide geographic distribution in the Old World, the following naturalized from Europe as a weed. Type species : Scleranthus annutis L. I. Scleranthus annuus L. Knawel. German Knotgrass. Fig. 1725. Scleranthus annuus L. Sp. PI. 406. 1753. Much branched from long and rather tough roots, the branches prostrate or spreading, 3-5' long, roughish- puberulent or glabrous. Leaves subulate, 2"-i2" long, ciliate, light green, often recurved, their bases membran- ous at the junction; tube of the calyx lo-angled, rather longer than the lobes, usually glabrous, the lobes some- what angled on the back and their margins incurved. In fields and waste places or on dry rocks, Quebec and On- tario to Pennsylvania and Florida, mostly near the coast. Naturalized from Europe. Very common in parts of the Eastern and Middle States. Gravel-chickweed. Parsley-piert. March-Oct. Family 20. NYCTAGINACEAE Lindl. Nat. Syst. Ed. 2, 213. Four-o'clock Family. Herbs (some tropical genera trees or shrubs) with simple entire leaves, and regular flowers in terminal or axillary clusters, in the following genera subtended by involucres of distinct or united bracts. Petals none. Calyx inferior, usually corolla-like, its limb campanulate. tubular or salverform. 4-5-lobed or 4-5-toothed. Stamens hypog>'nous ; filaments filiform : anthers 2-celled, dehiscent by lateral slits. Ovary enclosed by the tube of the perianth, sessile or stipitate, i-celled, i-ovuled: ovule campylotropous; style short or elongated; stigma capitate. Fruit a ribbed, grooved or winged anthocarp. About 25 genera and 350 species, of wide geographic distribution, most abundant in America. Involucre of united bracts : pairs of leaves equal. i. AUionia. Involucre of separate bracts ; pairs
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
