Yucca brevifolia

Engelmann
in S. Watson, Botany (Fortieth Parallel), 496. 1871.
Common names: Joshua tree
IllustratedEndemic
Basionym: Yucca draconis var. arborescens Torrey Pacif. Railr. Rep. 5(4): 147. 1857
Synonyms: Cleistoyucca arborescens (Torrey) Trelease Cleistoyucca brevifolia (Engelmann) Rydberg Yucca arborescens (Torrey) Trelease Yucca brevifolia var. herbertii (J. M. Webber) Munz Yucca brevifolia var. jaegeriana McKelvey
Treatment appears in FNA Volume 26. Treatment on page 426. Mentioned on page 421, 424, 427.
Revision as of 23:22, 27 May 2020 by imported>Volume Importer
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Plants usually solitary, erect, arborescent, to 15 m. Stems usually 1, occasionally several–many, simple or usually branched distally; branches 1–3 m. Leaf blade green, 15–35 × 0.7–1.5 cm, rigid, smooth, glabrous, margins nearly entire, minutely denticulate, yellow. Inflorescences erect, paniculate, densely crowded, ca. 1/2 enclosed in rosettes, ellipsoid-ovoid, 3–5.5 × 3–3.8 dm, glabrous. Flowers erect, 4–7 cm; perianth oblong-ellipsoid to globose; tepals barely connate at base, greenish white to cream, lanceolate to oblong, 2.5–7 × 1.1–2.2 cm; filaments 1–1.2 cm; anthers 3–3.2 mm, short-pubescent to papillate; pistil 2–3.5 cm; ovary ovoid, 2.5–3 cm, longer than broad; style ca. 1.6 mm; stigmas distinct. Fruits pendent, capsular, indehiscent, deeply furrowed, ellipsoid, 6–8.5 cm, dry, spongy. Seeds dull black, thin, 8–12 mm diam., smooth.


Phenology: Flowering late winter–mid spring.
Habitat: Deserts
Elevation: 400–1800 m

Distribution

V26 871-distribution-map.jpg

Ariz., Calif., Nev., Utah.

Discussion

There is disagreement regarding the status of entities within Yucca brevifolia. S. D. McKelvey (1935) described var. jaegeriana, the miniature Joshua tree, and L. D. Benson and R. A. Darrow (1981) recognized the variety as well; however, J. L. Reveal (1977c) declined to recognize it, a decision with which we agree.

Selected References

None.

Lower Taxa

None.

... more about "Yucca brevifolia"
William J. Hess +  and R. Laurie Robbins +
Engelmann +
Yucca draconis var. arborescens +
Joshua tree +
Ariz. +, Calif. +, Nev. +  and Utah. +
400–1800 m +
Deserts +
Flowering late winter–mid spring. +
in S. Watson, Botany (Fortieth Parallel), +
Illustrated +  and Endemic +
Cleistoyucca arborescens +, Cleistoyucca brevifolia +, Yucca arborescens +, Yucca brevifolia var. herbertii +  and Yucca brevifolia var. jaegeriana +
Yucca brevifolia +
species +