. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. 152 I^EXNSYLVANIA ACADEMY OF SCIENCE PEXNSYLVAXIA ACADEMY OF SCIENCES 153 limestone, in sterile, more or less acid clays, in acid litter of upland oak woods, and even around the margins of sphagnum bogs—it has spread nearly throughout the State, except on the higher plateaus and toward the northeast corner. Specimens are preserved in herbaria from the follow^- ing counties: Allegheny, Butler, Lawrence, Crawford, Erie; Armstrong, Clarion, Elk, McKean, Potter; Somerset, Cambria, Bedford, Huntingdon; Franklin, Cumberland, Lyc
. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. 152 I^EXNSYLVANIA ACADEMY OF SCIENCE PEXNSYLVAXIA ACADEMY OF SCIENCES 153 limestone, in sterile, more or less acid clays, in acid litter of upland oak woods, and even around the margins of sphagnum bogs—it has spread nearly throughout the State, except on the higher plateaus and toward the northeast corner. Specimens are preserved in herbaria from the follow^- ing counties: Allegheny, Butler, Lawrence, Crawford, Erie; Armstrong, Clarion, Elk, McKean, Potter; Somerset, Cambria, Bedford, Huntingdon; Franklin, Cumberland, Lycoming, Bradford; York, Lancaster, Berks, Luzerne; Chester, Delaw^are, Philadelphia, Montgomery, and Bucks. It also extends north into central New York. As early as 1740 John Bartram sent roots of this plant to Peter Collin- son in England, and he distributed it to other horticulturalists of the time. In the 1750's a painting of it was made for the series of illustrations of plants in ]\Iiller's Gardeners Dictionary, and when Linne founded the species in 1759 he cited this plate. Collomia linearis Nuttall. (^listakenly referred to the genus Gilia by Gray.)—A w^estern mountain plant which has become a weed in fields and waste places over a wide area, and occasionally appears in the Eastern States. There are two records for Pennsylvania, Hartstow^n, Crawford Co., and Angora, Philadelphia Co. PJilox siibulata Linne.—Since three geographic varieties mingle and intergrade in the West Virginia mountains, that region is regarded as the refuge of the species during the geological changes of Tertiary time. Variety ciliata (Brand) Wherry has subsequently migrated northeast- ward across Pennsylvania, becoming locally abundant, especially on sand and serpentine barrens. It often escapes from cultivation, but is believed to be native at one or more stations in 35 counties: Beaver, Butler; Alle- gheny, Westmoreland, Indiana; Somerset, Huntingdon, Centre, Lyco- ming, Tioga, Bradford; Fra
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