ABSTRACT An examination of the native vascular plant flora of Maryland during 1978 and 1979 as part of a review for the United States Fish and Wildlife Service’s endangered species program disclosed 237 different plants which could be considered rare or endangered in the State. This represents approximately ten percent of the native flora of Maryland. The present paper discusses 74 species, subspecies and varieties of Maryland plants which represent new state records or are plants of extreme rareness. Several species suggested by the Fish and Wildlife Service occur in Maryland, namely <em>Trillium pusillum</em> var. <em>virginianum</em> (E), <em>Alnus maritima</em> (T), <em>Cardamine longii</em> (T), <em>Habenaria flava</em> (T), <em>H. peramoena</em> (T), <em>Juncus caesariensis</em> (T), <em>Lilium grayi</em> (T), <em>Micranthemum micranthemoides</em> (T), and <em>Ptilimnium fluviatile</em> (T). Other recommended species were found in Maryland but were not considered to be in Maryland by the Fish and Wildlife Service at the time; these include such species
ABSTRACT <em>Thalictrum hepaticum</em> Greene (Ranunculaceae), a southern Appalachian taxon, is recognized as a variety [var. <em>hepaticum</em> (Greene) Keener, stat. nov.] of the polymorphic, wide-ranging <em>Thalictrum pubescens</em> Pursh. A key is provided for closely related species ranging throughout the southern Appalachians.
ABSTRACT The flower pigments of <em>Hexastylis virginica</em> and <em>H. heterophylla</em> are identical but differ markedly from those of <em>Asarum canadense</em>. The anthocyanin pigments of the <em>Hexastylis</em> species are complex acylated glycosides of both cyanidin and malvidin. The pigment of <em>Asarum canadense</em> is a simple unacylated glycoside of cyanidin.
ABSTRACT The arborescent vegetation of Highlands Hammock State Park, Highlands County, Florida, was sampled by means of the quadrat method during the late spring of 1979. Twenty-five 10 x 10 m quadrats were established in two areas of the park: the “Big Oak Trail” and the “Hickory Trail.” Density, relative density, frequency, relative frequency, basal area, relative dominance and importance values were calculated for each species. <em>Quercus virginiana</em> was dominant in the Big Oak Trail, and <em>Sabal palmetto</em> was co- dominant. <em>Sabal palmetto</em> was dominant on the Hickory Trail with <em>Quercus virginiana</em> the codominant species. <em>Carya glabra</em> while represented by several large trees, was fourth in relative dominance and importance value on the Hickory Trail. Infrequent but severe cold probably accounts for the dominance of the afore-mentioned species.