Floristic Discoveries in Delaware, Maryland, and Virginia.

Over the past decade studies in the field and herbaria have yielded significant advancements
in the knowledge of the floras of Delaware, Maryland, and the Eastern Shore of Virginia. We here
discuss fifty-two species newly discovered or rediscovered or whose range or nativity is clarified.
Eighteen are additions to the flora of Delaware (Carex lucorum var. lucorum, Carex oklahomensis,
Cyperus difformis, Cyperus flavicomus, Elymus macgregorii, Glossostigma cleistanthum, Houstonia
pusilla, Juncus validus var. validus, Lotus tenuis, Melothria pendula var. pendula, Parapholis
incurva, Phyllanthus caroliniensis subsp. caroliniensis, Ranunculus septentrionalis, Rhynchospora
rariflora, Planodes virginicum, Schoenoplectiella mucronata, Schoenoplectus purshianus var.
williamsii, Thlaspi alliaceum). Eighteen are additions to the flora of Maryland (Arctostaphylos uvaursi, Cardamine impatiens, Carex fissa var. fissa, Carex oklahomensis, Cyperus acuminatus, Cyperus
flavicomus, Eriophorum gracile var. gracile, Glossostigma cleistanthum, Juncus megacephalus,
Lysimachia japonica, Modiola caroliniana, Platanthera shriveri, Rhamnus alnifolia, Rhynchospora
inexpansa, Rubus bifrons, Schoenoplectiella mucronata, Stenanthium leimanthoides, and Tribulus
terrestris). Four are rediscoveries to Delaware (Carex tetanica var. canbyi, Cyperus compressus,
Kyllinga pumila, Phylanthus caroliniensis subsp. caroliniensis) and nine reports are rediscoveries to
Maryland (Amelanchier nantucketensis, Axonopus furcatus, Ludwigia glandulosa subsp. glandulosa,
Muhlenbergia uniflora, Puccinellia fasciculata, Ranunculus laxicaulis, Rhynchospora rariflora,
Sisyrinchium arenicola, Utricularia cornuta). Ten reports are additions to the flora of Maryland’s
Eastern Shore (Calepina irregularis, Cyperus difformis, Houstonia pusilla, Juncus articulatus, Juncus
elliottii var. elliottii, Melothria pendula var. pendula, Montia linearis, Parapholis incurva,
Phyllanthus caroliniensis subsp. caroliniensis, Senna obtusifolia). One report is an addition to the
flora of Virginia’s Eastern Shore (Houstonia pusilla) and another is a rediscovery (Quercus
virginiana). Additional reports clarify the nativity of Ludwigia leptocarpa in Delaware, the status of
Thlaspi alliaceum in Maryland, and the range and history of Gelsemium sempervirens on the Eastern
Shore of Virginia. Of these reports twenty eight represent native taxa and twenty four are non-native.

Click to access PhytoN-FloristicDelaware.pdf

Knapp, W.M., R.F.C. Naczi, W.D. Longbottom, C.A. Davis, W.A. McAvoy, C.T. Frye, J.W. Harrison, & P. Stango III. 2011. Floristic Discoveries in Delaware, Maryland, and Virginia. Phytoneuron. 2011–64:1–26.