Yucca rostrata Engelm. ex Trel. var. linearis Trel.
Yucca thompsoniana Trel.
Beaked yucca, Thompson’s yucca
Beaked yucca is a native of Texas.
Plants: Beaked yucca is a small tree 6–12′ (1.8–3.7 m) high and 6′ (1.8 m) wide, with a trunk that is sometimes branched. It is possible that the closely related Yucca ridigda is the same plant.
Leaves: Leaves emerge in a spherical shape from the tips of the trunk(s), with dead leaves forming a skirt around upper portions of each trunk. The stiff leaves, narrow and swordlike, 8–24 ⨉ ½″ (20–60 ⨉ 1.3 cm). Leaf edges are hard, pale yellow, often with fine teeth.
Flowers: White, round to bell-shaped, on 2–3′ (60–91 cm) stalks above the leaf clusters.
Fruits: Seed capsules are 1–2″ long ⨉ ⅜–¾″ thick (3–6 ⨉ 1–2 cm).
Habitats: Limestone hills, rocky slopes, and plains at about 3281′ (1 km) above sea level.
See the Yucca page for a comparison with other yuccas.
Online References:
References:
Irish, Mary & Irish, Gary, Agaves, Yuccas and Related Plants: A Gardener’s Guide, Timber Press, 2000, p. 265 (here called Yucca rostrada)
Yucca rostrata Engelm. ex Trel.
Yucca rostrata Engelm. ex Trel. var. linearis Trel.
Yucca rostrata Engelm. ex Trel. var. linearis Trel.
2/24/2010 · San Diego (Quail) Botanic Garden, Encinitas, California 
5/25/2009 · Boyce Thompson Arboretum, Superior, Arizona 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Liliopsida | Monocots (plants with a single seed leaf); includes the lily family |
| Subclass | Liliidae | Includes lilies, orchids, and many others |
| Order | Asparagales | A diverse group that includes asparagus |
| Family | Asparagaceae | Agaves, asparagus, hyacinths, and others |
| Genus | Yucca | Linnaeus mistakenly derived the genus name from the Carib word for (similar-appearing) cassava, yuca |
| Species | thompsoniana | For Charles Henry Thompson (1870-1931) |
Yucca thompsoniana description by Thomas H. Kent, not updated.
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