FWS Focus

Overview

Characteristics
Overview

Blodgett’s silverbush (Argythamnia blodgettii) is a perennial, semi-woody shrub that grows up to 3 feet tall with small, inconspicuous yellow-green flowers. It grows in openings in a variety of upland habitats in South Florida, including pine rocklands.

Threats

The primary threats to Blodgett’s silverbush are habitat destruction, fragmentation, and modification due to development, along with fire suppression, invasive plants, and sea level rise. One of the habitats where it grows, pine rocklands, is a globally imperiled ecosystem.

Scientific Name

Argythamnia blodgettii
Common Name
Blodgett's silverbush
FWS Category
Flowering Plants
Kingdom

Location in Taxonomic Tree

Identification Numbers

TSN:

Characteristics

Characteristic category

Life Cycle

Characteristics
Life Span

Undetermined, but likely a short-lived perennial, less than 10 years, that is capable of resprouting from underground reserves after fire.

Reproduction

Plants flower and produce seeds all year, peaking from March to June. The fruit is a three-parted capsule holding three round black seeds. Mature fruits display ballistic dispersal, flinging seeds roughly one foot from the parent. It likely forms persistent seed banks. It recruits prolifically from seed following storm surge events.

Characteristic category

Habitat

Characteristics
Habitat

Occurs in sunny openings in pine rocklands, rockland hammocks, and coastal berms, including roadsides and cleared areas of Monroe and Miami-Dade counties.

Characteristic category

Physical Characteristics

Characteristics
Size & Shape

Blodgett’s silverbush is a semi-woody shrub up to 3 feet tall with small, inconspicuous green flowers. Oval, slightly hairy leaves with veins branch from the base. Multiple green, unbranched stems also often sprout from the woody base. Leaves and stems turn a deep metallic blue when broken.

Characteristic category

Similar Species

Characteristics
Similar Species

Blodgett’s silverbush’s inconspicuous flowers lack petals and have leafy bracts beneath the flowers, distinguishing the species from most other forbs of similar size. When sterile, leaf venation helps one to distinguish, but sterile plants are often overlooked. Leaves of croton have silvery scales, stalked glands, or star-shaped hairs.

Geography

Characteristics
Range

Present only in the Keys in Monroe and Miami-Dade counties of Florida.

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