Frank Walton Gould

Elymus repens, commonly known as couch grass , is a very common perennial species of grass native to most of Europe, Asia, the Arctic, and northwest Africa. It has been brought into other mild northern climates for forage or erosion control, but is often considered a weed. Other names include common couch, twitch, quick grass, quitch grass (also just quitch), dog grass, quackgrass, scutch grass, and witchgrass.

Dichanthelium is genus of flowering plants of the grass family, Poaceae. They are known commonly as rosette grasses and panicgrasses.

Neobouteloua is a genus of Argentine and Chilean plants in the grass family. Species Neobouteloua lophostachya (Griseb.) Gould - Chile, Argentina (Catamarca, Córdoba, Salta, Tucumán, La Rioja, San Luis, Mendoza, Santiago del Estero) Neobouteloua pauciracemosa M.G.López & Biurrun - Argentina (La Rioja, San Luis)

Elymus trachycaulus is a species of wild rye known by the common name slender wheatgrass. It is native to much of North America. It grows in widely varied habitats from northern Canada to Mexico, but is absent from most of the southeastern United States. It is variable in appearance, but generally bears a very narrow, linear inflorescence of spikelets appressed against the stem. There are three subspecies, two very widespread and one which is limited to Greenland.

Elymus lanceolatus is a species of grass known by the common names thickspike wheatgrass and streamside wheatgrass. It is native to North America, where it is widespread and abundant in much of Canada and the western and central United States. There are two subspecies, subsp. lanceolatus occurring throughout the species' range and subsp. psammophilus occurring in the Great Lakes region. Elymus lanceolatus subsp. lanceolatus is a perennial, rhizomatous grass. It has a moderate growth rate and is shade intolerant. It is available commercially.

Elymus stebbinsii is a species of wild rye known by the common name Parish wheatgrass. It is endemic to California, where it grows in the forests and chaparral of many of the coastal and inland mountain ranges. It is a perennial grass growing up to 1.2 meters tall. The inflorescence is a narrow, linear series of single-spikelet nodes up to 25 centimeters long. Each spikelet is up to 2 centimeters long with a short awn of just a few millimeters.

Schizachyrium niveum, commonly referred to as pinescrub bluestem, is a rare species of grass endemic to peninsular Florida.

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Elymus violaceus, many synonyms including Elymus sierrae, is a species of wild rye. It is a perennial grass with stems growing 30 to 50 centimeters long and decumbent along the ground at maturity. The inflorescence is a series of single-spikelet nodes a few centimeters long, each spikelet with an outward-curved awn up to 2.5 centimeters long.

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Dichanthelium lanuginosum is a species of rosette grass native to North America. It is most common in the central and eastern United States. It is found in a variety of habitats, mostly in open, dry areas. A variety, D. lanuginosum var. thermale, grows in geothermal areas of Yellowstone National Park, United States. It is able to withstand high temperatures and high acidity in its rhizosphere. In 2007 it was found that the heat tolerance is conferred to the grass by a symbiosis between a fungus and a virus. When it is colonised by the fungus Curvularia protuberata and the fungus is in turn

Dichanthelium acuminatum, the tapered rosette grass, is a species of grass from the genus Dichanthelium, in North America. Dichanthelium acuminatum forms a hybridization complex with other Dichanthelium species such as D. dichotomum, D. sphaerocarpon, D. ovale, and D. aciculare. Dichanthelium acuminatum has been successfully raised in cultivation for seed production. This species has been observed growing in habitat types such as within oak and pine forests, wetland edges, and on sand dunes.

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Dichanthelium sphaerocarpon, also called Panicum polyanthes, common name round-seed panic grass, is a plant found in North America. It is listed as endangered in Michigan. Dichanthelium sphaerocarpon var. isophyllum is listed as a special concern and believed extirpated in Connecticut.

Dichanthelium scoparium is a species of grass known by the common names velvet panicum, velvety panicgrass, and broom panicgrass. It is native to North America, where it occurs in the southeastern United States. It also occurs in the West Indies. This rhizomatous perennial grass produces a basal rosette of leaves in the fall and winter and then erect stems the following spring. There are clumps of stems up to 1.5 meters tall. There are 7 to 11 hairy leaves up to 20 centimeters long by 2 wide on the stem. There are two types of inflorescence. The main panicle has flowers that open and are

Dichanthelium scabriusculum, commonly called tall swamp rosette-panicgrass, tall swamp panicgrass, rough panic-grass or panic grass, is a species of plant found in North America. It is listed as endangered in Connecticut, Maryland, and New York. It is listed as threatened in Massachusetts. D. scabriusculum has been observed growing in wet, lowland environments. This includes habitats such as streams, bogs, marshes, and swamps.

Dichanthelium ovale, commonly known as eggleaf rosette grass, is a plant found in North America. Dichanthelium ovale subsp. pseudopubescens, common name Stiff-leaved rosette-panicgrass is listed as a special concern and believed extirpated in Connecticut. D. ovale can grow in soils ranging from dry to damp, and has been observed in habitats such as sandy woods and pinelands.

Dichanthelium oligosanthes, known as Heller's rosette grass, fewanther obscuregrass, and few-flowered panicgrass, is a frost-tolerant, perennial grass species native to North America. It is found primarily in the contiguous United States with specimens also reported in British Columbia and Alberta in Canada, as well as south of the Rio Grande in northern Mexico. D. oligosanthes is most frequently in partially shaded glens within woods, recently cut forests, and grassy banks. The species is primarily cleistogamous, with individual florets often self pollinate without opening. Despite being a

Dichanthelium laxiflorum, commonly known as open-flower witchgrass, is a perennial graminoid in the family Poaceae that is found throughout the Americas.

Dichanthelium ensifolium, the small-leaved witchgrass, is a perennial graminoid native to the Atlantic Coastal Plain of the United States

Dichanthelium dichotomum is a species of perennial graminoid in the family Poaceae that is found throughout the Americas.

Dichanthelium consanguineum, commonly known as Kunth's witchgrass, is a perennial graminoid in the family Poaceae native to the southeast United States.