Agave flexispina Trel.
Flexible-spined agave
Agave flexispina is a medium-sized xerophytic succulent native to northwestern Mexico, with confirmed presence in Chihuahua and Sonora. It is characterized by its unusually flexible, semi-cartilaginous terminal spines compared to other agaves of the region, a trait that reflects adaptations to the strong winds of the semi-arid scrubland. It grows on volcanic and alluvial rocky slopes at 800–1,800 m elevation, forming scattered populations.
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Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Compact solitary rosette 50–90 cm in diameter. Leaves 40–65 cm long, pale gray-green, with toothed margins and a flexible to semi-flexible 3–5 cm apical spine. Monocarpic; produces rhizomatous pups before flowering. |
| Conservation Status | Not formally assessed by IUCN. Habitat fragmentation from extensive livestock grazing is the main threat to wild populations. |
| pH Target | 6.5–8.0 |
| Type | Rocky or sandy, volcanic or alluvial soil with excellent drainage |
Origin & Habitat
Morphology
Lanceolate, 40–65 × 5–8 cm, gray-green, with irregular marginal teeth 3–8 mm long and a 3–5 cm semi-flexible terminal spine, gray-brown at the base and paler at the tip.
ecoYellowish-green, 6–8 cm long, grouped in panicles on a 4–6 m scape. The primary axis branches in the upper third, producing numerous hermaphroditic flowers.
ecoVery short, caulescent stem at the rosette base. The floral scape is robust, erect, and green, with reflexed triangular bracts at the lower nodes.
ecoMixed root system: shallow absorbing roots up to 1 m in radius and deeper anchoring roots in rocky soils. They produce short rhizomes that give rise to pups.
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Requirements
Soil & Substrate
Type
Rocky or sandy, volcanic or alluvial soil with excellent drainage
groups Beneficial Associations
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Propagation Strategy
T
W
Every 3–5 years; when repotting, inspect roots and remove any rotten ones.
Minimal fertilization: 25% dilution of a cactus fertilizer (low in N) once in spring. Never in autumn or winter.
Uses & Applications
Precautions / Toxicity
The terminal spines, though more flexible than in other species, can cause puncture wounds. Sap may irritate skin and eyes. No serious systemic toxicity is known.
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Plant Health
Basal rot by Fusarium spp. — favored by substrates with excess organic matter and persistent moisture.
Mealybug (Pseudococcus spp.) — shelters at the leaf base; control with potassium soap or alcohol.
Agave snout weevil (Scyphophorus acupunctatus) — larval boring of the central stem; damage is irreversible in most cases.
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"The diagnostic character of the semi-flexible terminal spine is clinically variable: under severe water stress, spines may harden and be confused with A. bovicornuta. Verification with herbarium specimens from Chihuahua/Sonora is recommended. The species was described by Trelease based on material from northwestern Mexico."
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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.