Francis W. Pennell

Veronica catenata, the pink water speedwell, is a species of flowering plant in the family Plantaginaceae. It is native to Canada, the United States, Europe, the Azores, and northern Africa. As its common name implies, it prefers growing in or near marshes, rivers, lakes and ponds.

Veronicastrum sibiricum, the Sibirian veronicastrum, is a plant in the plantain family Plantaginaceae.

Lindernia dubia is a species of flowering plant known by the common names yellowseed false pimpernel and moist bank pimpernel. It is a member of the "new" plant family Linderniaceae, and it is sometimes treated as a member of the families Scrophulariaceae and Plantaginaceae. It is native to much of the Americas from Canada to Chile, and it can be found on other continents as an introduced species. It grows in wet habitat, such as riverbanks, pond margins, and meadows. It is an annual herb growing a mostly erect, branching stem to exceed 30 centimeters in height. The oppositely arranged leaves

Silviella is a genus of flowering plants belonging to the family Orobanchaceae. Species of the genus are native to Mexico. The genus name of Silviella is in honour of Baltasar da Silva Lisboa (1761–1840), a Brazilian lawyer and natural historian. It was first described in 1928.

Scrophularia villosa is a species of flowering plant in the figwort family known by the common name Santa Catalina figwort. It is endemic to the Channel Islands of California, where it is known only from Catalina and San Clemente Islands. It grows in coastal sage scrub and chaparral habitat. It is a shrub growing between one and two meters tall.

Cheilophyllum is a genus of flowering plants belonging to the family Plantaginaceae. It includes eight species, seven native to Cuba and one extinct in Jamaica.

Penstemon mensarum, commonly called Grand Mesa penstemon, is a perennial plant in the veronica family. It has a very limited range in western Colorado, but is also grown in gardens.

Penstemon lentus, the handsome penstemon, is a species of flowering plant from Four Corners region in the southwestern United states.

Penstemon alamosensis, commonly known as Alamo penstemon, is a rare species of penstemon from New Mexico and Texas. It is known for its tall flowering stems with coral-red flowers.

Pedicularis rainierensis is a species of flowering plant in the family Orobanchaceae commonly known as Mount Rainier lousewort. It is endemic to the vicinity of Mount Rainier in Washington state. The Mount Rainier lousewort has a imperiled status.

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Castilleja thompsonii is a species of hemiparasitic perennial herb in the Orobanchaceae family with the common name Thompson's Indian paintbrush. It is native to south central British Columbia and Washington State.

Castilleja mollis is a species of Indian paintbrush known by the common name softleaf Indian paintbrush. It is endemic to the Channel Islands of California, where it is currently known only from Santa Rosa Island. An occurrence was once noted on San Miguel Island, but the plant has not been found there since 1938. Its habitat is the coastal sage scrub around the windy sand dunes and bluffs.

Castilleja mendocinensis is a species of Indian paintbrush known by the common name Mendocino Coast Indian paintbrush. It is endemic to the coastline of Mendocino County, California, where it grows in coastal sage scrub habitat. It is also known from isolated occurrences in Humboldt County.

Castilleja glandulifera, commonly called the glandular paintbrush or sticky paintbrush is a species of paintbrush.

Bacopa eisenii is a species of water hyssop known by the common name Gila River water hyssop. It is native to California and Nevada, where it grows in wet habitat such as rice paddies and muddy river banks. This aquatic plant has rounded or oval leaves 1 to 3 centimeters long with several longitudinal veins. The flower appears on a stout pedicel; it is white with a bright golden throat. The fruit is a capsule containing many seeds.

Aureolaria virginica, the downy yellow false foxglove or downy oak leach, is a perennial forb native to the eastern United States and Canada, which produces yellow flowers in summer.

Aureolaria pedicularia, the fernleaf yellow false foxglove, fern-leaved false foxglove, or fernleaf false foxglove, is a hemiparasitic plant of the family Orobanchaceae. Aureolaria pedicularia is native to parts of the eastern US, the Midwest, and adjacent Canada. This plant is known for its distinct leaf shape and overall plant size. The common names for Aureolaria pedicularia come from its fern-like leaves.

Aureolaria pectinata, commonly called combleaf yellow false foxglove, false foxglove, and comb-leaf oakleach, is a species of plant in the broomrape family that is native to the southeastern United States. It is an annual plant that produces yellow flowers in the late summer on herbaceous stems. It possesses oppositely arranged, fern-like leaves. It is hemiparasitic, meaning that it gets some of its nutrients from other plants. A. pectinata attaches itself to the roots of oak trees, explaining the common name "oakleach".

Aureolaria patula, commonly known as spreading yellow false foxglove or Cumberland oak-leach, is a species of plant in the family Orobanchaceae. It is native to the upper Southeastern United States, where it is found in Alabama, Georgia, Kentucky, and Tennessee. Due to its limited geographic range, this species in considered vulnerable, and is listed as rare in every state it is found. It is often found in populations consisting of only a few plants. Its habitat is rich alluvial forests and limestone slopes along major rivers. Like other members of its genus, Aureolaria patula is

Agalinis purpurea (known by common names including purple false foxglove and purple gerardia) is an annual forb native to the eastern United States and Canada, which produces purple flowers in late summer or early fall.

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Smilax hugeri, common name Huger's carrionflower, is a North American plant species native to the south-eastern United States. It is found in Mississippi, Alabama, Georgia, Florida, Tennessee, and North and South Carolina.

Smilax biltmoreana, common name Biltmore's carrionflower, is a North American plant species native to the south-eastern United States. It is concentrated in the Great Smoky Mountains but with outlying populations in Virginia, North and South Carolina, Tennessee, Kentucky, Georgia, Alabama, and northern Florida.

Penstemon tenuiflorus, commonly known as eastern whiteflower beardtongue, is a species of flowering plant in the plantain family. It is native only to a small area of the Southeastern United States, in the southern Interior Low Plateau and Black Belt of Alabama and Mississippi. Its preferred habitat is limestone glades and woodlands.

Penstemon scariosus is a species of flowering plant in the veronica family known by the common name plateau penstemon. It is native to Colorado, Utah, and Wyoming in the United States. The rare White River penstemon (Penstemon albifluvis) has been and is still listed as a variety of this species by some botanical sources.

Penstemon ophianthus, the coiled anther penstemon, is a species of small perennial plant in the plantain family. It has very noticeable dark violet lines on its flowers over a lighter blue-lavender color. The species grows in the plateaus and canyon lands of western Colorado and New Mexico, northern Arizona, and southern Utah.

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Penstemon cyaneus is a species of flowering plant in the plantain family known by the common names blue penstemon and dark blue penstemon. It is native to the western United States, where it is widespread in Idaho and also found in parts of Montana and Wyoming.