Agave obscura Schiede
Obscure Agave
Agave obscura, described by German naturalist Christian Julius Wilhelm Schiede in the 19th century from material collected in Veracruz, is a medium-sized agave native to the semi-arid mountain zones of eastern Mexico. Currently treated by many taxonomists as a synonym of Agave polyacantha Haw. or as a variety (var. xalapensis), the name persists in historical literature and horticultural collections. It forms compact to semi-open rosettes with dark green, strongly toothed leaves adapted to habitats with seasonal fog and well-drained volcanic soils of the Veracruz highlands.
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Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Semi-compact rosette, acaulescent or with a short stem, 50–80 cm tall and 80–120 cm in diameter. Monocarpic; after several years of vegetative growth it produces a single inflorescence and dies. Usually produces offsets. |
| Conservation Status | No recent global IUCN assessment under the name A. obscura. Its populations in Veracruz state are fragmented; agricultural expansion and deforestation are the main threats. |
| pH Target | 6.0–7.0 |
| Type | Well-drained volcanic soil, moderately fertile, neutral to slightly acidic |
Origin & Habitat
Morphology
Linear-lanceolate leaves, 30–55 cm long and 4–7 cm wide, dark green and slightly glaucous, rigid. Margins with corneous teeth 5–10 mm long, brown to grayish, irregularly spaced. Terminal spine 2–3.5 cm long, channeled, dark brown to black.
ecoInflorescence a spike or panicle 3–5 m tall. Tubular greenish-yellow flowers 5–7 cm long. Blooms in spring to early summer; visited by bats, bees, and nocturnal moths.
ecoStem very short or absent; the rosette emerges almost at ground level. The central tissue accumulates carbohydrate reserves (mainly fructans) that are mobilized for the single flowering.
ecoFibrous root system, moderately deep. Main roots can penetrate rock crevices to anchor the plant on steep slopes. Some fleshy roots store water in the dry season.
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Requirements
Soil & Substrate
Type
Well-drained volcanic soil, moderately fertile, neutral to slightly acidic
groups Beneficial Associations
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Propagation Strategy
P
U
Every 3–5 years in spring
Light fertilization in spring and summer: balanced fertilizer (NPK 10-10-10) at 25% dilution, once a month. Suspend in autumn and winter.
Uses & Applications
Precautions / Toxicity
Pungent terminal spines pose a physical risk. Sap may cause dermatitis on sensitive skin. No significant oral toxicity reported.
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Plant Health
Basal rot by Fusarium oxysporum in poorly drained substrates or high ambient humidity
Root mealybug (Rhizoecus spp.) in dry season; detected by growth retardation
Agave snout weevil (Scyphophorus acupunctatus): larva destroys the center of the rosette
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"The taxonomy of A. obscura is complex: modern revisions group it with A. polyacantha, although var. xalapensis retains differentiated morphological characters. Cultivated in Xalapa and other Mexican botanical gardens as reference material. It is advisable to request certified material to avoid confusion with similar species."
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Scientific Integrity
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Sources
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Discussion
Disclaimer
This species record is provided for educational and informational purposes only. Jardín Roca Negra does not guarantee the accuracy or completeness of the data. Content is community-curated and may be subject to revision; it should not replace advice from a qualified botanist. This species may be toxic, invasive, or subject to legal restrictions — verify before handling or cultivating. Jardín Roca Negra accepts no liability for any harm arising from reliance on this information. Images are reproduced under Creative Commons or equivalent free licenses; credits are noted below each image.