Lithospermum Arvense L., Corn Gromwell

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May 2016 Plant of the Month Lithospermum arvense L., Corn Gromwell Plant of the Month for May is a non native annual and a member of the Borage family now a permanent member of our upland flora. Lithospermum arvense, the corn gromwell, is an infrequent roadside annual. Mary Hough (1983) maps the plant in thirteen of our twenty one Counties, excluding the northwestern and Pine Barrens Counties. Lithospermum arvense grows in an interesting niche, many times occupied by upland natives such Danthonia spicata, Dichanthelium spherocarpon and Carex albicans var. emmonsii. I recently crossed paths with our Plant of the Month in the village of Malaga, Gloucester County. Here, it was growing on an occasionally mowed road edge with Myosotis arvense, Valerianella locusta, Vicia tetraspermum and Danthonia spicata. At first glance I was thinking the plant could be the rare false gromwell, Onosmodium virginianum (S1). They both are Borage family members, and both have annual habits, with alternate leaves. In fact, Lithospermum arvense is the only alternate leaf in the genus Lithospermum. The key to the identification is the flower color and structure. Lithospermum is white, open 5-cleft flowers whereas the false gromwell is yellow, barely open, scorpioid flowers. Native Americans throughout North America used other native Lithospermum species prior to the introduction of the annual arvense. The native species provided analgesic and anti- hemorrhagic poultices and infusions. Corn gromwell is edible and used as a salad green. Our annual species should be visible on stable roadside and in open upland woods of the Delaware and Raritan Valleys through the month of May. JRA, 5/2016 .

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