~ John Mills Parrish, 2002
| Latin Name | Common Name | State Rank/Status | Occurrence | Where Found |
|---|---|---|---|---|
| GYMNOSPERMAE - GYMNOSPERMS | ||||
| Cupressaceae - Cypress Family | ||||
| Juniperus virginiana | Red Cedar | C | ||
| Pinaceae - Pine Family | ||||
| Pinus strobus | White Pine | VR | Patuxent St. Park; Northwest Br. Park | |
| Pinus rigida | Pitch Pine | UC | Scattered throughout county | |
| Pinus echinata | Yellow/Shortleaf Pine | UC | Scattered throughout county | |
| Pinus pungens | Table-mountain Pine | VR | NW Branch Pk; Blockhouse Pt. Park | |
| Pinus virginiana | Virginia Pine | C | ||
| Tsuga canadensis | Hemlock | VR | Patuxent St. Pk; Seneca Ck. St. Park | |
ANGIOSPERMAE - MONOCOTS |
||||
| Smilacaceae - Catbrier Family | ||||
| Smilax glauca | Glaucous Greenbrier | C | ||
| Smilax hispida (syn. S. tamnoides) | Bristly Greenbrier | UC/R | Potomac River & Rock Ck. floodplain | |
| Smilax rotundifolia | Common Greenbrier | C | ||
ANGIOSPERMAE - DICOTS |
||||
| Salicaceae - Willow Family | ||||
| Salix nigra | Black Willow | C | ||
| Salix caroliniana | Carolina Willow | S3 | R | Potomac River floodplain |
| Salix interior (syn. S. exigua) | Sandbar Willow | S1/E | VR/X? | Plummer's & High Is. (1902) (S.I.) |
| Salix humilis | Prairie Willow | R | Travilah Serpentine Barrens | |
| Salix sericea | Silky Willow | UC | Little Bennett Pk.; NW Br. Pk. (Layhill) | |
| Populus grandidentata | Big-tooth Aspen | UC | Scattered across county - (uplands) | |
| Populus deltoides | Cottonwood | FC | ||
| Myricaceae - Bayberry Family | ||||
| Myrica cerifera | Southern Bayberry | VR | Little Paint Branch n. of Fairland Park | |
| Comptonia peregrina | Sweet Fern | VR/X? | Lewisdale, (pers. com. C. Bergmann) | |
| Juglandaceae - Walnut Family | ||||
| Juglans cinerea | Butternut | S2S3 | R | NW Branch; Patuxent & Potomac R. |
| Juglans nigra | Black Walnut | FC | ||
| Carya cordiformis | Bitternut Hickory | FC | ||
| Carya ovata | Shagbark Hickory | VR | Blockhouse Pt. Pk; Patuxent St. Park | |
| Carya tomentosa | Mockernut Hickory | C | ||
| Carya glabra | Pignut Hickory | C | ||
| Carya ovalis | Sweet Pignut Hickory | UC | Scattered throughout county | |
| Carya laciniosa | Big Shellbark Hickory | S1/E | X | Historic record (Brinklow, Md) MNHP |
| Betulaceae - Birch Family | ||||
| Corylus americana | Hazelnut | FC | ||
| Ostrya virginiana | Hop-Hornbeam | UC/R | Slopes along Potomac & Mill Creek | |
| Carpinus caroliniana | Ironwood | C | ||
| Betula lenta | Black Birch | UC/R | Scattered throughout county | |
| Betula nigra | River Birch | FC | ||
| Betula populifolia | Gray Birch | SU | VR | Fairland Park; Triadelphia Reservoir |
| Alnus serrulata | Smooth Alder | FC | ||
| Fagaceae - Beech Family | ||||
| Fagus grandifolia | American Beech | FC | ||
| Castanea dentata | American Chestnut | S2S3 | UC | Scattered throughout county |
| Castanea pumila | Chinquapin | UC | Scattered throughout county | |
| Quercus alba | White Oak | C | ||
| Quercus stellata | Post Oak | UC | Scattered throughout county | |
| Quercus macrocarpa | Bur Oak | S1 | VR | Great Falls to DC line along Potomac |
| Quercus bicolor | Swamp White Oak | UC | Scattered throughout county | |
| Quercus michauxii | Basket/Swamp Chestnut Oak | VR | Little Falls; Blockhouse Point | |
| Quercus muehlenbergii | Chinquapin Oak | R | Wheaton Reg Pk; Mill Ck; Potomac | |
| Quercus prinoides | Dwarf Chinquapin Oak | S3 | X | Clopper 1912; Wheaton 1915 (S. I.) |
| Quercus prinus | Chestnut Oak | FC | ||
| Quercus rubra | Red Oak | C | ||
| Quercus shumardii | Shumard's Oak | S2/T | VR | Hoyles Mill Park; Potomac floodplain |
| Quercus velutina | Black Oak | C | ||
| Quercus palustris | Pin Oak | FC | ||
| Quercus coccinea | Scarlet Oak | FC | ||
| Quercus falcata | Spanish or Southern Red Oak | FC | ||
| Quercus ilicifolia | Bear Oak | VR | Little Bennett Park | |
| Quercus marilandica | Black Jack Oak | UC/R | Travilah Serp. Barren; Rt29 to PG line | |
| Quercus imbricaria | Shingle Oak | UC | Scattered throughout county | |
| Quercus phellos | Willow Oak | UC/R | Triassic basin; Little Paint Branch | |
| Ulmaceae - Elm Family | ||||
| Ulmus rubra | Slippery Elm | UC/FC | Prefers non-acid soils | |
| Ulmus americana | American Elm | C | ||
| Celtis occidentalis | Hackberry | UC | Potomac R.; Triassic basin | |
| Celtis tenuifolia | Dwarf Hackberry | R | Shale barrens; slopes along Potomac | |
| Moraceae - Mulberry Family | ||||
| Morus rubra | Red Mulberry | UC/R | Hoyles Mill Diabase; Travilah Serp. | |
| Loranthaceae - Mistletoe Family | ||||
| Phoradendron flavescens | Mistletoe | VR | Nyssa grove, Potomac Meth. Church | |
| Ranunculaceae - Crowfoot Family | ||||
| Clematis virginiana | Virgin's-bower | FC | ||
| Clematis viorna | Leather-flower | S3 | VR | Potomac Gorge; Muddy Branch Park |
| Menispermaceae - Moonseed Family | ||||
| Menispermum canadense | Moonseed | UC | Prefers alluvial soils | |
| Magnoliaceae - Magnolia Family | ||||
| Magnolia virginiana | Sweet Bay Magnolia | R | Little Paint Br; upper NWB & Rock Ck | |
| Magnolia tripetala | Umbrella Magnolia | S3 | VR | NW Br.; Patuxent St. Pk; Sligo Ck Pk |
| Magnolia acuminata | Cucumber Tree | VR | Blockhouse Pt. Conservation Park | |
| Liriodendron tulipifera | Tulip Poplar | C | ||
| Annonaceae - Custard-apple Family | ||||
| Asimina triloba | Papaw | UC | Locally abundant; also locally absent | |
| Lauraceae - Laurel Family | ||||
| Sassafras albidum | Sassafras | C | ||
| Lindera benzoin | Spicebush | C | ||
| Saxifragaceae - Saxifrage Family | ||||
| Hydrangea arborescens | Hydrangea | UC | Prefers steep rocky stream banks | |
| Ribes sp. | Currants/Gooseberries | X | Extirpated? I have no record for them | |
| Hamamelidaceae - Witch-Hazel Family | ||||
| Hamamelis virginiana | Witch-Hazel | FC | ||
| Liquidambar styraciflua | Sweet Gum | R | Rt. 29 east to PG county line | |
| Platanaceae - Plane-tree Family | ||||
| Platanus occidentalis | Sycamore | C | ||
| Rosaceae - Rose Family | ||||
| Physocarpus opulifolius | Ninebark | UC/R | Great Falls; Travilah Serp. Barrens | |
| Spirea alba | Meadow-sweet | R | North Br. Rock Ck; NW Br. Randolph | |
| Spirea tomentosa | Steeple-bush | VR | Rachel Carson Conservation Park | |
| Aronia arbutifolia | Red Chokeberry | UC | Little Paint Branch; scarce elsewhere | |
| Aronia melanocarpa | Black Chokeberry | UC | Little Paint Branch; scarce elsewhere | |
| Malus coronaria | Wild Crab-apple | R | Travilah Serpentine Barrens | |
| Amelanchier stolonifera (syn. A. spicata) | Running Juneberry | S2/T | VR | Potomac Gorge open rock outcrops |
| Amelanchier canadensis | Swamp Juneberry | VR | Little Paint Branch | |
| Amelanchier arborea | Downy Juneberry | C | ||
| Amelanchier laevis | Smooth Juneberry | UC | Scattered throughout county | |
| Crataegus uniflora | Dwarf Hawthorn | R | Potomac Gorge; Hoyles Mill Diabase | |
| Crataegus intricata | Entangled Hawthorn | UC/R | Travilah Serp.Barrens; Rock Ck. Park | |
| Crataegus viridis | Southern Hawthorn | R | Mill Creek wetland at Shady Grove Rd | |
| Crataegus crus-galli | Cockspur Hawthorn | R | Travilah Serpentine Barrens | |
| Rubus odoratus | Purple Raspberry | X | Hist. from Great Falls (Palmer) (H&S) | |
| Rubus hispidus | Swamp Dewberry | FC | ||
| Rubus flagellaris | Northern Dewberry | FC | ||
| Rubus occidentalis | Black Raspberry | FC | ||
| Rubus allegheniensis | Allegheny Blackberry | UC | Patuxent State Park | |
| Rubus argutus | Tall Blackberry | C | ||
| Rosa palustris | Swamp Rose | UC | NBRC; NWB; LPB; scarce elsewhere | |
| Rosa carolina | Pasture Rose | FC | Travilah Serp. Barrens & elsewhere | |
| Prunus americana | Wild Plum | R | Travilah Serp. Barrens; shale soils | |
| Prunus serotina | Black Cherry | C | ||
| Prunus pumila | Dwarf Cherry | SU | X | Gt. Falls - Pollard & Coville 1895 (S.I.) |
| Fabaceae - Legume Family | ||||
| Gleditsia triacanthos | Honeylocust | UC | Potomac River floodplain | |
| Cercis canadensis | Redbud | UC/FC | locally common, prefers non acid soil | |
| Robinia pseudo-acacia | Black Locust | C | ||
| Rutaceae - Rue/Citrus Family | ||||
| Ptelea trifoliata | Hop-tree | S3 | VR | Potomac Gorge |
| Zanthoxylum americanum | Northern Prickly-ash | S1/E | VR | Hoyles Mill Diabase near Boyds, Md. |
| Anacardiaceae - Sumac/Cashew Family | ||||
| Rhus glabra | Smooth Sumac | UC | Scattered throughout county | |
| Rhus copallina | Shining Sumac | C | ||
| Rhus typhina | Staghorn Sumac | C | ||
| Rhus aromatica | Fragrant Sumac | VR | River Road Shale Barrens | |
| Toxicodendron vernix | Poison Sumac | R | Little Paint Branch; Good Hope Trib; | |
| Toxicodendron radicans | Poison Ivy | C | ||
| Toxicodendron quercifolia | Poison Oak | VR | Blockhouse Point rocky bluff outcrop | |
| Aquifoliaceae - Holly Family | ||||
| Ilex opaca | American Holly | FC | ||
| Ilex verticillata | Winterberry | FC | ||
| Ilex laevigata | Smooth Winterberry | VR | Little Paint Branch "magnolia bogs" | |
| Ilex decidua | Deciduous Holly | S2 | VR | Potomac Gorge |
| Celastraceae - Staff-tree Family | ||||
| Euonymus atropurpureus | Wahoo | R | Potomac floodplain n. of White's Frry | |
| Euonymus americanus | Strawberry Bush | FC | ||
| Celastrus scandens | Bittersweet | Under review | VR | Hoyles Mill Diabase Area |
| Staphyleaceae - Bladdernut Family | ||||
| Staphylea trifolia | Bladdernut | UC | Local along streams, rich alluvial soils | |
| Aceraceae - Maple Family | ||||
| Acer saccharum | Sugar Maple | UC | Potomac River and Seneca Creek | |
| Acer rubrum | Red Maple | C | ||
| Acer saccharinum | Silver Maple | FC | Prefers rich soil along streambanks | |
| Acer negundo | Box Elder | C | ||
| Rhamnaceae - Buckthorn Family | ||||
| Ceanothus americanus | New Jersey Tea | UC/R | Serpentine, diabase, & shale barrens | |
| Ceanothus ovatus (syn. C. herbaceus) | Prairie Redroot | ? | VR/X? | High Is.(1898); Little Falls (1876) (S.I.) |
| Vitaceae - Grape Family | ||||
| Parthenocissus quinquefolia | Virginia Creeper | C | ||
| Vitis labrusca | Fox Grape | FC | ||
| Vitis aestivalis | Summer Grape | C | ||
| Vitis riparia | Riverbank Grape | UC | Along the Potomac River | |
| Vitis vulpina | Winter Grape | FC | ||
| Vitis rupestris | Sand Grape | S1 | VR/X? | Gt. Falls 1919; Plummer Is. 1906 (S. I.) |
| Tiliaceae - Linden/Basswood Family | ||||
| Tilia americana | Basswood (Linden) | UC/R | Potomac floodplain; Seneca Ck.Wtrsd | |
| Tilia heterophylla | White Basswood | UC/R | intergrades with T. americana, Pot. R. | |
| Clusiaceae - St. John's-wort Family | ||||
| Ascyrum hypericoides | St. Andrew's Cross | FC | dry upland open woods & fields | |
| Hypericum spathulatum | Shrubby St. John's-wort | R | Great Falls; Travilah Serp.; Diabase | |
| Hypericum densiflorum | Glade St. John's-wort | X? | No record; Grows in Howard Cty | |
| Thymelaeaceae - Mezereum Family | ||||
| Dirca palustris | Leatherwood | S2/T | VR | Potomac Gorge; Travilah Serpentine |
| Nyssaceae - Sour Gum/Tupelo Family | ||||
| Nyssa sylvatica | Black Gum | C | ||
| Araliaceae - Ginseng Family | ||||
| Aralia spinosa | Angelica-tree/Hercules' Club | UC | Scattered throughout county | |
| Cornaceae - Dogwood Family | ||||
| Cornus florida | Flowering Dogwood | C | ||
| Cornus amomum | Silky Dogwood | FC | ||
| Cornus racemosa | Gray-stemmed Dogwood | VR | Travilah Serpentine Barrens | |
| Cornus alternifolia | Alternate-leaf Dogwood | X | Damascus, MD. (Mearns1895) (S.I.) | |
| Clethraceae - White-alder Family | ||||
| Clethra alnifolia | Sweet Pepperbush | VR | Fairland Regional Park near Little PB | |
| Ericaceae - Heath Family | ||||
| Chimaphila maculata | Spotted Wintergreen | C | ||
| Chimaphila umbellata | Pipsissewa | S1 | VR | Patuxent St. Pk; Hoyles Mill Cons. Pk |
| Rhododendron maximum | Rosebay Rhododendron | VR | Blockhouse Point/C&O Park (ravine) | |
| Rhododendron nudiflorum syn. periclymenoides | Pinxter Azalea | C | ||
| Rhododendron viscosum | Swamp Azalea | R | Little Paint Br.; NBRC; Rachel Carson | |
| Kalmia latifolia | Mountain Laurel | FC | ||
| Lyonia ligustrina | Maleberry | R | Little PB; NBRC; Travilah Serpentine | |
| Lyonia mariana | Staggerbush | VR | Briggs Chaney Rd./ Little Paint Brnch | |
| Leucothoe racemosa | Swamp Sweetbells | R | Little PB; NWB; Travilah Serpentine | |
| Epigaea repens | Trailing Arbutus | UC | Scattered throughout county | |
| Gaultheria procumbens | Wintergreen | R | NWB; RCk; Rachel Carson; Little PB | |
| Gaylussacia baccata | Black Huckleberry | FC | ||
| Gaylussacia frondosa | Dangleberry | R | Little Paint Branch; Paint Branch | |
| Vaccinium stamineum | Deerberry | FC | ||
| Vaccinium angustifolium | Late Low Blueberry | R | Little Paint Brnch; Travilah Serpentine | |
| Vaccinium vacillans | Early Low Blueberry | C | ||
| Vaccinium corymbosum | Blue Highbush Blueberry | R | Little Paint Branch | |
| Vaccinium atrococcum (syn. V. fuscatum) | Black Highbush Blueberry | FC | Scattered throughout county | |
| Ebenaceae - Ebony Family | ||||
| Diopyros virginiana | Persimmon | C | ||
| Oleaceae - Olive Family | ||||
| Fraxinus americana | White Ash | C | ||
| Fraxinus pensylvanica | Green Ash | C | ||
| Fraxinus nigra | Black Ash | S3 | VR | Hoyles Mill Diabase; N. Germantn Pk |
| Chionanthus virginicus | Fringe-tree | UC | Scattered throughout county | |
| Bignoniaceae - Bigonia Family | ||||
| Campsis radicans | Trumpet-creeper | FC | ||
| Rubiaceae - Madder Family | ||||
| Mitchella repens | Partridge-berry | C | ||
| Cephalanthus occidentalis | Buttonbush | FC/UC | Open wetlands throughout county | |
| Caprifoliaceae - Honeysuckle Family | ||||
| Lonicera sempervirens | Trumpet Honeysuckle | R | NWB, Rock Ck, & Wheaton Reg. Pks | |
| Viburnum nudum | Swamp Haw Viburnum | R | Little Paint Br.; Good Hope wetlands | |
| Viburnum prunifolium | Black Haw Viburnum | C | ||
| Viburnum rafinesquianum | Downy Arrow-wood | VR | Potomac River Gorge | |
| Viburnum dentatum (includes V. recognitum) | Arrow-wood | C | ||
| Viburnum acerifolium | Maple-leaved Viburnum | C | ||
| Sambucus canadensis | Elderberry | FC | ||