§ 45.13. Pennsylvania Threatened.
Plant species classified as Pennsylvania Threatened are as follows:
| Scientific Name | Common Name |
| Aconitum uncinatum L. | Blue Monkshood |
| Ammophila breviligulata Fern. | American Beachgrass |
| Arceuthobium pusillum M. E. Peck | Dwarf Mistletoe |
| Aristida purpurascens Poir. | Arrow-Feather Three-Awned Grass |
| Asplenium bradleyi D. C. Eat. | Bradley’s Spleenwort |
| Aster depauperatus (Porter) Fern. | Serpentine Aster |
| Aster novi-belgii L. | Long-Leaved Aster |
| Bidens bidentoides (Nutt.) Britt. | Swamp Beggar-Ticks |
| Bouteloua curtipendula (Michx.) Torr. | Tall Gramma |
| Camassia scilloides (Raf.) Cory | Wild Hyacinth |
| Carex alata Torr. | Broad-Winged Sedge |
| Carex aquatilis Wahlenb. | Water Sedge |
| Carex cryptolepis Mackenzie | Northeastern Sedge |
| Carex diandra Schrank | Lesser Panicled Sedge |
| Carex flava L. | Yellow Sedge |
| Carex oligosperma Michx. | Few-Seeded Sedge |
| Carex paupercula Michx. | Bog Sedge |
| Carex prairea Dewey | Prairie Sedge |
| Carex schweinitzii Dewey ex Schwein. | Schweinitz’s Sedge |
| Carex sterilis Willd. | Atlantic Sedge |
| Carex tetanica Schkuhr | Wood’s Sedge |
| Carex wiegandii Mackenzie | Wiegand’s Sedge |
| Chamaesyce polygonifolia (L.) Small | Small Sea-Side Spurge |
| Chrysopsis mariana (L.) Ell. | Maryland Golden-Aster |
| Cimicifuga americana Michx. | Mountain Bugbane |
| Cypripedium reginae Walt. | Showy Lady’s-Slipper |
| Digitaria cognatum (Schultes) Pilger | Fall Witch-Grass |
| Dodecatheon amethystinum (Fassett) Fassett | Jeweled Shooting-Star |
| Eleocharis intermedia Schultes | Matted Spike-Rush |
| Eleocharis robbinsii Oakes | Robbins’ Spike-Rush |
| Ellisia nyctelea L. | Ellisia |
| Erigenia bulbosa (Michx.) Nutt. | Harbinger-of-Spring |
| Eriophorum viridicarinatum (Engelm.) Fern. | Thin-Leaved Cottongrass |
| Euthamia tenuifolia (Pursh) Greene | Grass-Leaved Goldenrod |
| Fimbristylis annua (All.) Roemer & Schultes | Annual Fimbry |
| Gaylussacia brachycera (Michx.) Gray | Box Huckleberry |
| Hypericum densiflorum Pursh | Bushy St. John’s-Wort |
| Hypericum majus (Gray) Britt. | Larger Canadian St. John’s-Wort |
| Ilex opaca Ait. | American Holly |
| Juncus alpinus Vill. | Richardson’s Rush |
| Juncus balticus Willd. | Baltic Rush |
| Juncus brachycephalus (Engelm.) Buch. | Small-Headed Rush |
| Juncus torreyi Coville | Torrey’s Rush |
| Lathyrus japonicus Willd. | Beach Peavine |
| Lathyrus ochroleucus Hook. | Wild Pea |
| Linnaea borealis L. | Twinflower |
| Lobelia dortmanna L. | Water Lobelia |
| Lycopodium appressum (Chapman) Lloyd & Underwood | Southern Bog Clubmoss |
| Magnolia tripetala (L.) L. | Umbrella Magnolia |
| Magnolia virginiana L. | Sweet Bay Magnolia |
| Melica nitens (Scribn.) Nutt. ex Piper | Three-Flowered Melic Grass |
| Minuartia glabra (Michx.) Mattf. | Appalachian Sandwort |
| Myrica gale L. | Sweet Bayberry |
| Myriophyllum tenellum Bigelow | Slender Water-Milfoil |
| Najas gracillima (A. Braun) Magnus | Bushy Naiad |
| Nymphoides cordata (Ell.) Fern. | Floating-Heart |
| Oenothera argillicola Mackenzie | Shale-Barren Evening-Primrose |
| Panicum tuckermanii Fern. (Fernald, M. L., Gray’s Manual of Botany, 1970, Eighth edition) | Tuckerman’s Panic-Grass |
| Poa paludigena Fern. & Wieg. | Bog Bluegrass |
| Polygonum robustius (Small) Fern. | Robust Smartweed |
| Potamogeton confervoides Reichenb. | Tuckerman’s Pondweed |
| Potamogeton richardsonii (Benn.) Rydb. | Red-Head Pondweed |
| Potentilla anserina L. | Silverweed |
| Ptelea trifoliata L. | Common Hop-Tree |
| Ranunculus longirostre Godr. | Eastern White Water-Crowfoot |
| Ribes triste Pallas | Red Currant |
| Ruellia strepens L. | Limestone Petunia |
| Salix candida Flugge ex Willd. | Hoary Willow |
| Salix serissima (Bailey) Fern. | Autumn Willow |
| Scirpus pedicellatus Fern. | Stalked Bullrush |
| Scleria pauciflora Muhl. ex Willd. | Few-Flowered Nutrush |
| Spiraea betulifolia Pallas ssp. corymbosa (Raf.) Taylor & MacBryde | Dwarf Spiraea |
| Streptopus amplexifolius (L.) DC. | White Twisted-Stalk |
| Talinum teretifolium Pursh | Round-Leaved Fame-Flower |
| Utricularia intermedia Hayne. | Flat-Leaved Bladderwort |
| Utricularia minor L. | Lesser Bladderwort |
| Viola appalachiensis Henry | Appalachian Blue Violet |
| Vittaria appalachiana Farrar & Mickel (Morris Arboretum, 1992, Pennsylvania Flora Database) | Appalachian Grass-Fern |
The provisions of this § 45.13 adopted December 4, 1987, effective January 1, 1988, 17 Pa.B. 5027; amended June 18, 1993, effective June 19, 1993, 23 Pa.B. 2816. Immediately preceding text appears at serial page (123453).
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