Clusterspike False Indigo vs Dense-flowered Fumitory

Amorpha crenulata compared with Fumaria densiflora

Taxonomic Classification

Rank	Clusterspike False Indigo	Dense-flowered Fumitory
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order	Fabales (Legumes & Allies)	Ranunculales (Ranunculales)
Family	Fabaceae	Papaveraceae
Genus	Amorpha	Fumaria
Species	Amorpha crenulata	Fumaria densiflora

Evolutionary Relationship

Clusterspike False Indigo and Dense-flowered Fumitory share a common ancestor at the Class level: Magnoliopsida. (Dicots)

Conservation Status

Clusterspike False Indigo

CR — Critically Endangered

Dense-flowered Fumitory

CR — Critically Endangered

Physical Characteristics

Attribute	Clusterspike False Indigo	Dense-flowered Fumitory
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Clusterspike False Indigo

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Dense-flowered Fumitory

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and Mediterranean forests and woodlands within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Europe (11 countries), North America (United States), and Oceania and the Pacific (Australia). Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Clusterspike False Indigo

Amorpha crenulata, known as clusterspike false indigo or crenulate lead plant, is a critically endangered flowering shrub in the family Fabaceae with a highly restricted distribution confined to Miami-Dade County in southern Florida, USA. This species represents one of North America's rarest plants, with remaining populations numbering in the hundreds of individuals occurring in pine rockland habitat, an ecosystem itself ranked among the most imperiled in the United States. Pine rocklands are fire-dependent communities on exposed oolitic limestone, characterized by an open canopy of slash pine over diverse understory, and have been reduced to less than two percent of their historical extent by urban development in the Miami metropolitan area. Amorpha crenulata produces elongated spikes of small purple flowers typical of the genus and was historically more widespread across the Miami Rock Ridge before land development eliminated most habitat. Current populations exist primarily within Everglades National Park and a few private preserves. Its Critically Endangered status reflects the tiny remaining population, extreme habitat restriction, ongoing threats from urbanization, altered fire regimes, and sea-level rise that threatens low-elevation limestone habitats. Conservation efforts focus on habitat protection, controlled burning to maintain pine rockland structure, and ex situ seed banking.