Agavaceae
Intermountain Flora, v. 6, p. 526
- 1. Ovary superior; tepals white to creamy or rarely yellowish, free or nearly so; anthers included.
- 2. Flowers large, 3 cm or more long, usually succulent, campanulate to globose; leaves with a terminal spine. Yucca
- 2.1. Fruits indehiscent, fleshy or dry and spongy; plants large and arborescent with small, thin, nonfibrous leaves, or cespitose perennials with large, rigid, broad, swordlike leaves with a long terminal spine.
- 2.2. Plants cespitose or nearly so; leaves 5-7.5 dm long, concavo-convex, strong and rigid; fruits fleshy; S Nevada and S Utah. Yucca baccata
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| Yucca baccata |
Yucca baccata |
Yucca baccata |
- 2.2' Plants arborescent; leaves (1)-1.5-3.5 dm long, plano-convex, thin; fruits spongy and dry; SW Nevada, SE Nevada and extreme SW Utah. Yucca brevifolia
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| Yucca brevifolia |
Yucca brevifolia |
Yucca brevifolia |
- 2.1' Fruits dehiscent, loculicidal or (ours) septicidal; plants acaulescent with long, narrow, flexible, grasslike leaves, or if broader and rigid, then less than 5 dm long.
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| Leaf cross-section shapes |
- 2.3. Leaves concavo-convex, 1-5 dm long, lanceolate; inflorescence racemose or nearly so, 3.5-7 dm long on a short flowering stalk 1-4 dm long; style bright green, 9-13 mm long; fruit constricted; throughout most of Utah and portion of Nevada. Yucca harrimaniae
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| Yucca harrimaniae |
Yucca harrimaniae |
- 2.3' Leaves plano-convex, mostly linear; style white to pale green; fruits mostly not constricted, but if so, then inflorescences and flowering stems much longer.
- 2.4. Inflorescences simply racemose or at most with a few abortive branchlets, not paniculate; plants mostly acaulescent to slightly caulescent.
- 2.5. Flowering stems short, less than 1 dm long; inflorescence within or just barely exceeding the leaves, in ours up to 0.5 m in length; fruits pendulous, not constricted; San Juan, Kane counties, Utah. Yucca baileyi
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| Yucca baileyi |
Yucca baileyi |
Yucca baileyi |
- 2.5' Flowering stems long, 3-25 dm long; inflorescence well beyond the leaves, 0.3-1.5-(2) m in length; fruits erect, constricted but sometimes only slightly so; C Utah southward. Yucca angustissima
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| Yucca angustissima |
Yucca angustissima |
Yucca angustissima |
- 2.5'1. Capsules deeply constricted, small, 3.5–5.5-(5.7) cm; scape and inflorescence 0.5–1.8 m.
- 2.5'2. Flowers 4.5–5.5 cm; leaf blade 25–45 cm; style 10–13 mm; SW Utah, N Arizona, W New Mexico. Yucca angustissima var. angustissima
- 2.5'2' Flowers 3.5–4.5–(5.2) cm; leaf blade 40–60 cm; style 7–10 mm; C Utah (Piute, Wayne counties). Yucca angustissima var. avia
- 2.5'1' Capsules moderately constricted, large, 4.5–7.5 cm; scape and inflorescence 2.0–4.5 m.
- 2.5'3. Flowers 3–5.2 cm; leaf blade 20–75 cm; pistil 15–32 mm; style 3–10 mm; flowering stem 1.2-2.5 m; scape and inflorescence 0.2–2.5 m, with 1-15 lateral branches; Kane, Garfield, San Juan counties. Yucca angustissima var. toftiae
- 2.5'3' Flowers 5.5–6.5 cm; leaf blade 45–80–(150) cm; pistil 3–3.5 cm; style 5–8 mm; flowering stem 1-1.5 m; scape and inflorescence 1–2 m, simple, with 1 to few lateral branches; sandy sites in W. Kane and E Washington counties. Yucca angustissima var. kanabensis
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| Yucca angustissima |
Yucca angustissima |
Yucca angustissima |
- 2.4' Inflorescence panicles with only the uppermost flowers racemose; plants caulescent or rarely acaulescent; capsules only slightly, if at all, constricted; Washington county, Utah, south into Mohave county, Arizona. Yucca utahensis = Yucca elata var. utahensis
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| Yucca utahensis |
Yucca utahensis |
Yucca utahensis |
- 2' Flowers small, less than 1 cm long, not succulent, campanulate; leaves without a terminal spine. Washington county. Nolina microcarpa
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| Nolina microcarpa |
Nolina microcarpa |
- 1' Ovary inferior; tepals yellow, united at the base into a tube; anthers long exserted. Washington county. Agave utahensis
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| Agave utahensis |
Agave utahensis |
Agave utahensis |
Agave utahensis |