Agave impressa Gentry
Impressed agave
Agave impressa is a monocarpic succulent endemic to the coastal sierra of Sinaloa and Nayarit in western Mexico. Its name alludes to the striking 'impressed' or bud-printing marks on the abaxial leaf surface, created by prolonged contact with adjacent leaves in the apical bud. It grows on rocky slopes of tropical dry forest and subtropical dry scrub at 200–1,000 m elevation.
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Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Dense, symmetrical rosette 60–100 cm in diameter, formed by imbricated leaves that leave relief marks on each other. Leaves 40–70 cm long, gray-green with lighter-colored bud-print lines. Monocarpic; produces few lateral pups. |
| Conservation Status | Not formally assessed by IUCN. Species with restricted distribution; deforestation and agricultural conversion of coastal dry forest represent the main threat. |
| pH Target | 6.0–7.5 |
| Type | Thin volcanic rocky soil with good drainage and slight organic load |
Origin & Habitat
Morphology
Lanceolate, 40–70 × 6–10 cm, gray-green, with a flat or slightly concave adaxial surface and a characteristic impressed-marked abaxial surface. Margins with corneous teeth 4–8 mm long and a pungent 3–5 cm terminal spine.
ecoYellow to yellowish-green, 6–8 cm long, arranged in a terminal panicle on a 4–7 m scape. Stamens protrude conspicuously from the perianth at anthesis.
ecoShort, nearly acaulescent rosette stem. The floral scape is robust and heavily branched in the upper third, producing a wide and striking panicle.
ecoExtensive, shallow fibrous roots adapted to capturing water in thin soils over volcanic rock. They do not form thickened storage roots.
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Requirements
Soil & Substrate
Type
Thin volcanic rocky soil with good drainage and slight organic load
groups Beneficial Associations
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Propagation Strategy
P
O
Every 3–4 years; in a large pot it can be left longer if drainage remains efficient.
Cactus fertilizer (low N, high K) at 50% of the recommended dose, once in spring. Avoid excess nitrogen to preserve rosette compactness.
Uses & Applications
Precautions / Toxicity
Sap contains saponins and calcium oxalates: may irritate skin and mucous membranes. Terminal spines represent the main physical hazard. No serious systemic toxicity is documented.
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Plant Health
Root and crown rot (Phytophthora spp., Pythium spp.) — high risk in humid climates with compacted substrate.
Citrus mealybug (Planococcus citri) — colonizes bud-printing zones where the leaf is thinner; treat with neem oil.
Agave snout weevil (Scyphophorus acupunctatus) — larvae destroy the central meristem; preventive inspection recommended in spring.
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"The bud-printing marks of A. impressa are an unambiguous diagnostic character that facilitates field identification. Howard Scott Gentry described it in his 1982 monograph based on collections from Sinaloa. It is particularly striking in cultivation due to the contrast between the pale markings and the gray-green leaf background."
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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.