Mary Elizabeth Barkworth

Thinopyrum intermedium, known commonly as intermediate wheatgrass, is a sod-forming perennial grass in the Triticeae tribe of Pooideae native to Europe and Western Asia. It is part of a group of plants commonly called wheatgrasses because of the similarity of their seed heads or ears to common wheat. However, wheatgrasses generally are perennial, while wheat is an annual. Trials with intermediate wheatgrass, the product of which is trademarked by the Land Institute as "Kernza", show that it can be grown as a "multi-functional" crop, yielding various commodities as well as ecosystem services.

Nassella viridula is a species of grass known by the common name green needlegrass. It is native to North America, where it is widespread in western Canada and the western and central United States. It is introduced in parts of eastern North America. This grass forms tufts of stems up to about 1.2 meters tall. It grows from a fibrous root network which may penetrate over 1.5 meters deep in the soil. The leaves are mostly basal. Each is up to 30 centimeters long and tapers to a threadlike tip. The spikelets have awns reaching nearly 4 centimeters long, each bent twice. The plant reproduces via

Nassella tenuissima is a species of grass known by the common names Mexican feathergrass, finestem needlegrass, fineleaved nassella, and Argentine needle-grass. It is native to the south-western United States, northern Mexico and Argentina. It is well-matched to climate in Australia and can be harmful to the Australian environment. It is still widely referenced in botanical and horticultural literature under its synonym Stipa tenuissima, and has received the Royal Horticultural Society's Award of Garden Merit under that name.

Elymus wawawaiensis is a species of grass known by the common name Snake River wheatgrass. It is native to western North America, where it occurs in the Pacific Northwest. It is native to eastern Washington and Oregon and parts of Idaho. The Elymus wawawaiensis grass is long-lived and drought-tolerant. There are cultivars available, including 'Secar', which is especially tolerant of drought. Other cultivars include 'Discovery'.

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Nassella lepida (syn. Stipa lepida) is a species of grass known by the common names foothill needlegrass, foothills nassella, foothill stipa, small-flowered stipa, small-flowered needlegrass, and smallflower tussockgrass.

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Hesperostipa is a genus of grasses in the family Poaceae. Members of the genus are commonly known as needle-and-thread grass or needlegrass. The Hesperostipa species, formerly called Stipa, are endemic to North America. The new name adds Classical Greek: ἕσπερος, romanized: hesperos, lit. 'western', as other Stipa species are found on the Eurasian continent (i.e., the eastern hemisphere).

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Amelichloa is a genus of flowering plants belonging to the family Poaceae. Its native range stretches from Mexico into southern South America. It is found in (southern, north-eastern and north-western) Argentina, Chile, most of Mexico and Uruguay. The genus was circumscribed by Mirta O. Arriaga and Mary Elizabeth Barkworth in Sida vol.22 on page 146 in 2006. The genus name of Amelichloa is in honour of María Amelia Torres (1934–2011), who was an Argentine botanist, lecturer and curator of the Herbarium of the National University of La Plata.

Nassella pulchra, basionym Stipa pulchra, is a species of grass known by the common names purple needlegrass and purple tussockgrass. It is native to the U.S. state of California, where it occurs throughout the coastal hills, valleys, and mountain ranges, as well as the Sacramento Valley and parts of the Sierra Nevada foothills, and Baja California. It grows in many types of local habitat, including grassland, chaparral, and oak woodland. It grows well on clay and serpentine soils.

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Hesperostipa spartea, formerly Stipa spartea, is a species of grass known by the common names porcupine grass, western porcupine grass, short-awn porcupine grass, porcupine needlegrass, and big needlegrass. It is native to North America, where it is widespread from British Columbia to Ontario in Canada and through the central and Great Lakes regions of the United States. It is a bunchgrass species in the genus Hesperostipa.

Hesperostipa comata, commonly known as needle-and-thread grass, is a species of grass native to North America, especially the western third. It has a wide distribution spanning from northern Canada to Mexico.

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Anthosachne sacandros is a species of true grass in the tribe Triticeae. It is endemic to open habitats in the Marlborough Region of New Zealand. It grows on limestone cliffs, bluffs and river terraces, from elevations of 0–900 m. It flowers from October–February, and fruits from December–May.

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Nassella cernua (syn. Stipa cernua) is a species of grass known by the common name nodding needlegrass. The bunchgrass is native to western California in the United States and Baja California in Mexico.