| Yellow Flowers |
 Yellow Stargrass, Hypoxis hirsuta: Blooms April to September. Found in open woods and dry meadows. Location: Strasburg Reservoir, GWNF, VA.
Trout Lily (Erythronium
americanum): Stream-side plant but has also been
found on PA ridge tops. Blooms in May. Location:
Pond Run Trail,
Large Yellow Wood Sorrel, Oxalis Grandis: Seems to be more scarce than its Pink/purple cousin. Grows in open woods and along roadsides. Location: Massanutten Mt Tr, GWNF, VA.
Celadine (Chelidonium majus): Blooms May-June. Can grow to 18 inches. Location: AT in SNP, VA.
Fringed Loosestrife (Lysimachia ciliata): Grows in moist areas. Location: Williams River, Tea Creek Backcountry, MNF, WV.
Pale Jewel Weed (Impatiens pallida): AKA Touch-Me-Not. Summer Bloomer. Location: SNP, Nicholson Hollow Trail.
Yellow Lady's-Slippers (Cypripedum calceolus): In the orchid family. Related to Pink Lady's-Slippers. Two flowers on one stem (as shown here) is a rarity. Location G. Richard Thompson WMA, VA.
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 Prickly Pear Cactus (Opuntia humifusa): Just starting to bloom here. Location: Billy Goat Trail, Great Falls National Park, MD. Photo by Ken Clark.
Rattlesnake-Weed (Hieracium venosum): Gets its name because it thrives in the same habitat as Rattle snakes. Blooms April to September. The blue-green Oval leaves with dark purple veins are quite conspicuous.
Common Yellow Wood Sorrel, Either Oxalis stricta or europaea. Considered a weed in gardens and sidewalks. Location: Pine Lick Trail, Green Ridge SF, MD.
Marsh Marigold (Caltha palustris): As the name implies these flowers love water. Bloom April-June. Location: Cranberry Glades, MNF, WV.
Cinquefoil: One of several species. Grows to about a foot. Note the saw toothed-lanceolete leaves. Location: Pine Creek, PA above the Grand Canyon.
Smooth False Foxglove (Aureolaria laevigata): Grows in a semi-parasitic relationship with oak. Summer bloomer. There are 3 varieties of False Foxglove all with similar flowers. Location: Rockytop Trail, SNP, VA.
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 Round-Leaved Yellow Violet (Viola rotundifolia): Leaves the same as common purple Violets but the flower petals are quite different. Location: Shenk's Ferry Wildflower Preserve, Holtwood Recreation Are, PA.
Whorled Loostrife, Lysimachia quadrifolia: 4 leaved whorls of lanceolet leaves with small yellow flowers w/red centers under the leaves. Photo by Anita Mueller.
Wild Oats/Bellwort (Uvularia sessilfolia): Stems grow through the leaves as the flowers nod. Grows on dry mountain trails. Blooms in May. Location: AT in SNP, VA.
Yellow Harlequin Corydalis (Corydalis flavula): Flowers May-Sept. Very small flowers. Location: Shenk's Ferry Wild Flower Preserve, Holtwood Recreation Area, PA. Close-up by Ken Clark.
Bird's-foot Trefoil (Lotus corniculatus), invasive. Location: Double Pine Schoolhouse, Green Ridge SF, MD.
Yellow Pimpernel (Taenidia integerrima): Similar to Golden Alexander but with smaller flowers, thinner stems and smooth (vs. toothed leaves. Photo by Ken Clark.
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 Nodding Bur-Marigold, Bidens cernua: Grows 1-3 feet. Thrives in wet, sunny places. Location: Pine Creek, PA.
Two-flowered Cynthia 0r Orange
Dwarf Dandelion
Butter-and-Eggs (Lineria vulgaris): In the Snapdragon family. A European introduction. Blooms throughout the summer. Individual flowers reminiscent of "eggs frying in butter". Location: AT - Tar Jacket Ridge, GWNF, VA.
Wood Betony or Lousewort (Pedicularis cacanadensis): In the Snap Dragon family. Can also be found in the wild in red or red/yellow. Domestic varieties come in even more colors. Blooms April to June. When the flowering is finished the hairy basal leaves lie flat on the ground. The flower body will resemble a pine cone. Photo by Anita Mueller.
Hop Clover (Trifolium agrarium) : Grows along edges and roadsides. Blooms in summer. Location: Cranberry Wilderness.
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Wild Indigo (Baptisia tinctoria): Bushy shrub in the pea family. Grows along trails and roads. Location: Three Pond section of the Tuscarora Tr, GWNF, WV. Photo bt Ken Clark.
Golden Alexander (Zizia aurea): In the Parsley family. Blooms in May. Location: Cornelius Creek Tr, Jefferson NF, VA.
Partridge Pea (Cassia fasciculata): Blooms July - August. Grows in open fields. Location: Jug Bay, Patuxent River, MD. Photo by Ken Clark.
Evening Primrose (Oenothera biennis): Summer Bloomer. Grows over 4 feet tall. Sunny, wet areas. Flower closes during the day. Location: Williams River, Tea Creek Backcountry, MNF, WV.
Squaw Root(Herniaria glabra ): Parasitic plant devoid of Chlorophyll. Gets it's nutrients from the roots of Oak trees. Location: Long Pond Trail, GRSF, MD.
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