Clusterspike False Indigo vs Devil weed

Amorpha crenulata compared with Sargassum horneri

Key Differences

• Clusterspike False Indigo is Critically Endangered while Devil weed is Not Evaluated.

Taxonomic Classification

Rank	Clusterspike False Indigo	Devil weed
Kingdom	Plantae (พืช)	Chromista (โครมิสตา)
Phylum	Magnoliophyta (Flowering Plants)	Ochrophyta (Ochrophyta)
Class	Magnoliopsida (พืชใบเลี้ยงคู่)	Phaeophyceae (Phaeophyceae)
Order	Fabales (อันดับถั่ว)	Fucales (Fucales)
Family	Fabaceae	Sargassaceae
Genus	Amorpha	Sargassum
Species	Amorpha crenulata	Sargassum horneri

Conservation Status

Clusterspike False Indigo

CR — Critically Endangered

Devil weed

NE — Not Evaluated

Physical Characteristics

Attribute	Clusterspike False Indigo	Devil weed
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.

Devil weed

Habitat

Native to Asia and North America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Mexico, Taiwan, and United States.

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.