Susan Delano McKelvey

Yucca pallida, sometimes called pale yucca, is a species of yucca native to Northern Mexico and parts of the blackland prairies of northern and central Texas, and notable for its light-colored leaves that range from a pale blue-gray to sage-green in color. The rosettes average 20–50 cm tall and 30–80 cm in diameter, with leaves 15–40 cm long and 2–3 cm wide, being widest around the midpoint. The rosettes sit directly on the ground, with little or no trunk. The leaves have a yellow to brown terminal spine, and are generally flat, possibly with some waviness or rolling along the edges. The

Yucca carnerosana, commonly known as the giant Spanish dagger, is a species of North American plant in the asparagus family that grows in arid and desert climate areas. In the United States, it is confined to only a few counties in western Texas, where endemic populations are found in rocky outcrops. The species is, however, widely distributed in northern Mexico (Coahuila, Durango, Zacatecas, Nuevo León). It has a wide range and is abundant, and although it has local threats, its population appears to be stable overall. This yucca is cultivated in a few areas such as the western United

Yucca campestris, the plains yucca, is a species in the family Asparagaceae, endemic to the "panhandle" region of northwestern Texas. It is considered to be endangered, mainly due to habitat loss. Yucca campestris is a low-growing species spreading by underground rhizomes and producing large colonies of rosettes. Leaves are long and narrow, up to 65 cm long but rarely more than 15 mm wide. Flowers are white and drooping. Fruit is a dry capsule with glossy black seeds. Yucca campestris grows in deep sands in very dry regions. It can be grown as an ornamental in desert regions, preferring warm

Yucca intermedia McKelvey is a species in the family Asparagaceae, with the common name intermediate Yucca. It is a relatively small plant forming clumps of rosettes. It is native to dry steppes, juniper-pinyon woodlands and savannahs, and desert grassland areas of the northwestern quarter of the US State of New Mexico, then into the Four Corners region, at an elevation of 1,400–2,300 m (4,600–7,500 ft).

Yucca utahensis is a species in the family Asparagaceae, native to Utah, Nevada and Arizona. McKelvey Yucca utahensis can reach a height of 10 feet (3 m), though it is usually much smaller. Stems are sometimes procumbent, often several per colony, forming colonies of several individuals. Leaves are narrow and needle-like, up to 70 cm long but rarely more than 2 cm wide, with fibers separating along the margins. Flowers are creamy white, nodding, bell-shaped. Fruit is a dry capsule with black seeds.

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Hesperoyucca newberryi, commonly known as the Grand Canyon Quixote plant or Newberry's yucca, is a plant species endemic to Arizona. It is found only in Mohave and Coconino Counties, on the walls of canyons near the Colorado River. Hesperoyucca newberryi is a perennial forming a rosette. It is semelparous (flowering once then dying). Leaves are narrow, up to 60 cm (24 in) long but usually less than 3 cm (1.2 in) across. Flowering stalks are up to 160 cm (63 in) tall, bearing cream-colored flowers. The fruit is a dry, egg-shaped capsule about 4 cm (1.6 in) long.

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