Vascular Plant Flora of Patuxent Research Refuge
Authors: Bill Harms
Locality: Patuxent Research Refuge (39.060200, -76.780700)
Abstract:


Established in 1936 by executive order of President Franklin D. Roosevelt, the Patuxent Research Refuge is the nation's only national wildlife refuge established to support wildlife research. It is located between Washington, DC and Baltimore, MD.

CT=Central Tract
NT=North Tract
ST=South Tract

Nativity to refuge - Native, exotic, and uncertain.

Abundance qualifiers for refuge.
Abundant: occurring usually in large numbers or occupying large areas.
Common: plentiful throughout.
Frequent: widely distributed; occasionally plentiful.
Infrequent: occurring only occasionally.
Rare: not often found owing to its scarcity.
Local: restricted to a particular area.

The checklist uses Weakley 2022 with minor modifications for taxonomic nomenclature.

For additional information about this checklist, please contact: Bill Harms (botanybill@philcobill.com)

For comments about or corrections to individual entries, please leave a comment on the individual species page. Or contact Bill at the above email address

This is a work in progress and as such please use the data with care.


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Families: 148
Genera: 564
Species: 1295
Total Taxa: 1312

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Equisetum hyemale L. - Tall Scouring-Rush
Acalypha rhomboidea Raf. - Common Three-Seed-Mercury
Disturbed areas, infrequent, locally common, native, CT, NT, ST; Bill Harms 6924 [MARY], Bill Harms 6893 [MARY], Bill Harms 9894 [USFWS], Bill Harms 6893 [USFWS]
Acalypha virginica L. - Virginia Three-Seed-Mercury
Disturbed areas, rare, locally common, native, CT, NT, ST; Bill Harms 6924 [USFWS], Bill Harms 9446 [USFWS], N. Hotchkiss 5537 [USFWS], Bill Harms 9673 [USFWS]
Mostly roadside hedgerows, infrequent, locally common, exotic, CT, NT, ST; Bill Harms 7374 [USFWS], Bill Harms 7422 [USFWS]
Vicia sativa L. - Garden Vetch
Vicia villosa Roth - Winter Vetch
mesic and xeric woodlands, infrequent, CT, NT, ST; native; population declined due to chestnut blight, Cryphonectria parasitica; attempts to plant back crosses with Chinese chestnut in public viewing areas underway.; Bill Harms 9073 [MARY], Bill Harms 9073 [USFWS], N. Hotchkiss 5239 [USFWS], Bill Harms 7490 [USFWS]
Fagus grandifolia Ehrh. - American Beech
Fagus sylvatica L. - European Beech
Hedgerow, Local, NT, CT; exotic; Bill Harms 6860 [MARY], Bill Harms 6860 [USFWS]
edge habitats, rare, locally common, CT, NT, ST; exotic, introduced as part of wildlife plantings; Bill Harms 6380 [USFWS], Bill Harms 7123 [USFWS], Bill Harms 6004 [USFWS]
open areas and wood margins, infrequent, CT, NT, ST; native; leaf morphology of individual trees strongly suggests widespread introgression with other red oak species; Dayton, W 1275 [MOR], Chandler S. Robbins 15 [MARY], Bill Harms 6986 [MARY], Bill Harms 7328 [USFWS], more...
mesic woods, rare, usually seen as individual trees, CT, NT; native; Bill Harms 7605 [MARY], Bill Harms 7329 [USFWS], Bill Harms 7605 [USFWS]
Experimental planting, local, NT; exotic to refuge.; Bill Harms 7616 [USFWS], Bill Harms 7744 [USFWS], Bill Harms 7533 [USFWS]
Mesic and xeric woodlands; woods margins, infrequent, CT, NT, ST; native; leaf morphology of individual trees strongly suggests widespread introgression with other red oak species; Bill Harms 7569 [MARY], Bill Harms 7569 [USFWS], N. Hotchkiss 5654 [USFWS], Bill Harms 7628 [USFWS], more...
Hamamelis vernalis Sarg. - Ozark Witch-Hazel
"wildflower" garden, Single tree; Bill Harms 8774 [USFWS], Ann Coren 39 [USFWS]
Juncus effusus L. - Lamp Rush
Ajuga reptans L. - Carpet Bugle
Lawn weed, local, one station, exotic, planted, persisting, and spreading, CT; Bill Harms 9577 [USFWS]
Monarda didyma L. - Scarlet Beebalm
Planted and persisting.; Bill Harms 7444 [USFWS]
Monarda punctata L. - Spotted Beebalm
clearing in oak-maple woods, locally abundant, exotic, overtaking native vegetation, NT; Bill Harms 6033 [USFWS], Bill Harms 6313 [USFWS]
Erythronium americanum Ker Gawl. - American Trout-Lily
Disturbed areas, rare, exotic, CT, NT; N. Hotchkiss 5364 [USFWS], Bill Harms 9438 [USFWS]
Hibiscus moscheutos L. - Crimson-Eye Rose-Mallow
Lake, pond, and impoundment margins, Infrequent, locally common; Ernest Clarke 86 [MARY], Bill Harms 6791 [USFWS], Bill Harms 6960 [USFWS], F. M. Uhler s.n. [USFWS]
Tilia americana L. - American Basswood
Aletris farinosa L. - White Colicroot
Open field, local, one station, native, CT, probably extirpated from refuge; N. Hotchkiss 5304 [USFWS]
Nymphaea odorata Aiton - American White Water-Lily
Oenothera fruticosa L. - Narrow-Leaf Evening-Primrose
Onoclea sensibilis L. - Sensitive Fern
Terrace woods, local, known from one station, native, CT, NT, ST; Bill Harms 6245 [USFWS]
Platanthera flava (L.) Lindl. - Pale-Green Orchid
Spiranthes lacera (Raf.) Raf. - Northern Slender Ladies'-Tresses
Spiranthes ovalis Lindl. - October Ladies'-Tresses
Agalinis decemloba (Greene) Pennell - Ten-Lobe False Foxglove
Grass covered slope, local, one station, native, CT, probably extirpated from refuge, source: Neel, M. C. 2002; Neel , M. C. , and M. P. Cummings 2004; and Pettengill, James B. & Neel, Maile 2011; N. Hotchkiss 5631 [USFWS]
Agalinis tenuifolia (Vahl) Raf. - Slender-Leaf False Foxglove
Local, CT or ST, Native, source: E.C. Leonard 19203 [US]
Aureolaria virginica (L.) Pennell - Downy Yellow False Foxglove
Melampyrum lineare Desr. - American Cow-Wheat
Pinus L. - pine
River edge, roadside edge, infrequent, native, CT, NT, ST; N. Hotchkiss 7122 [USFWS]
Meadow, local, one station, native, CT; E. E. Terrell s.n. [MARY]
Agrostis stolonifera L. - Spreading Bent
Sandy area, pitch pine woods, local, one station, native, NT; Bill Harms 8015 [USFWS], Matt Perry s.n. [USFWS]
Aira caryophyllea L. - Common Silver-Hair Grass
Roadsides open disturbed fields, common, locally abundant, native, CT, NT, ST; Bill Harms 9539 [USFWS], Bill Harms 9281 [USFWS], N. Hotchkiss 5145 [USFWS], Bill Harms 9198 [USFWS], more...
Andropogon gyrans Ashe - Elliott's Bluestem
On slope, local, one station, native, CT or ST; N. Hotchkiss 5739 [USFWS]
Andropogon ternarius Michx. - Split-Beard Bluestem
Open shrub meadows, infrequent, locally common, native, CT, NT, ST; Bill Harms 8222 [USFWS], Bill Harms 8241 [USFWS]
Andropogon virginicus L. - Chalky Bluestem
Aristida dichotoma Michx. - Church-Mouse Three-Awn
Dsturbed areas, old fields, open meadows, rare, native, CT or ST; Frederick J. Hermann 9950 [MICH], N. Hotchkiss 5745 [USFWS]
"Field in high bottoms", local, one station, exotic, CT; N. Hotchkiss 5559 [USFWS]
Aristida purpurascens Poir. - Arrow-Feather Three-Awn
"Barren sandy soil", local, known from one station, native, CT or ST; N. Hotchkiss 5650 [USFWS]
"Banks of pond", local, known from one station, native, NT; Dakar, Jacob 195 [NCU]
Edge of stream, local, known from one station, exotic, CT, from clump transplanted 24 Aug 1968, from edge of brook in serpentine area "Soldiers Delight", west Baltimore Co with North Hotchkiss & J Benedict; F. M. Uhler s.n. [USFWS]
Coleataenia longifolia (Torr.) Soreng - Long-Leaf Cut-Throat Grass
Echinochloa crusgalli - Large Barnyard Grass
Elymus hystrix L. - Eastern Bottle-Brush Grass