Yucca ×schottii Engelm. (pro sp.)
Yucca schottii Engelm.
Yucca ×schottii Engelm. (pro sp.) [baccata × elata]
Yucca arizonica McKelvey
Yucca baccata Torr. var. brevifolia (Schott ex Torr.) L.D. Benson & Darrow
Yucca brevifolia Schott ex Torr. nom. inval.
Yucca macrocarpa Engelm. non Merriam
Yucca puberula Torr.
Yucca thornberi McKelvey
Yucca treleasei J.F. Macbr.
Blue yucca, Schott’s yucca, mountain yucca, hoary yucca
Schott’s yucca is native to moutainous areas of Arizona, southwestern New Mexico, and the Mexican states of Chihuahua and Sonora. They appear at elevations of 4000-7000' (1.2-2.1 km). The ‘×’ indicates a cross between two species, in this case a natural hybrid believed to be between Yucca baccata and Y. madrensis. (The same ‘×’ can also indicate a cultivar created when a horticulturist crosses two species in an attempt to strengthen some desired feature, such as appearance, robustness, or edibile food yield.)
Plants: Plants are up to 16' (5 m) in height, with pineapple-like trunks up to 12" (30 cm) across, sometimes branching.
Leaves: Leaves are lanceolate, blue- to gray-green, spiked, quite rigid, up to 3" (8 cm) wide in the center and tapering at both ends, and up to 24" (60 cm) long. Leaves are tipped by hard spines, and lack the fibrous threads found in many other yuccas.
Flowers: White or cream-colored, on conical spikes up to 24" (60 cm) high and 10" (25 cm) around. Individual flowers are up to 1¾" (5 cm) long, with 3 sepals and 3 petals. There are 6 stamens, and an ovary with 3 stigmas. Flowers appear from July to September.
Fruits: Fleshy and egg-shaped, containing black seeds.
Yucca ×schottii (pro sp.) on Wikimedia Commons
Yucca ×schottii (pro sp.) on www.americansouthwest.net
Yucca ×schottii (pro sp.) on Wikipedia
Yucca ×schottii (pro sp.) at the Encyclopedia of Stanford Trees, Shrubs and Vines
Yucca ×schottii (pro sp.) at the Lady Bird Johnson Wildflower Center
Yucca ×schottii (pro sp.) description by Thomas H. Kent, last updated 25 May 2020.