CPC Plant Profile: Scrub Lupine
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Plant Profile

Scrub Lupine (Lupinus westianus var. aridorum)

The upper petal of the otherwise pink flower of L. aridorum has a black center surrounded by a maroon area. Flowers are arranged in racemes, with each raceme holding from 5 up to 25 flowers. Photo Credit: Jon Shaw
Description
  • Global Rank: T1 - Critically Imperiled
  • Legal Status: Federally Endangered
  • Family: Fabaceae
  • State: FL
  • Nature Serve ID: 133225
  • Date Inducted in National Collection: 06/18/1986

Scrub lupine is a woody perennial herb, and is the only upright, pink-flowering lupine in Florida. On stems that can reach 1 m in height are 4-7 cm long leaves that are pointed at the top and rounded at the base. Both leaves and stems are covered by thousands of tiny silver hairs. In bloom between March and May, the flowers of Lupinus aridorum are a pale-pink color, 4-5 cm long, and appear in groups of 5 to 14 on flowering racemes. The fruit of this species is found in June, and is long (2-2.5cm), woody, and elliptic in shape, tapering to a sharp tip. (USFWS 1999)

Participating Institutions
Updates
Center for Plant Conservation
  • 08/19/2021
  • Orthodox Seed Banking

In 2021, CPC contracted Bok Tower Gardens to recollect seed from a population currently held in long term orthodox seed storage as part of an IMLS-funded seed longevity experiment. The National Laboratory for Genetic Resources Preservation will evaluate how germination tested viability and RNA Integrity of seed lots decline over time in storage.

Nature Serve Biotics
  • 05/02/2017

A taxon with a very narrow range and low abundance: the Florida Natural Areas Inventory currently contains 35 occurrence records in its database, all located in Orange, Polk, and Osceola counties, Florida. Most of the occurrences are in degraded, roadside situations. There is great pressure on the habitat from unrestricted land development for housing and recreation.

Dorothy M. Brazis
  • 01/01/2010

Principal causes of decline include habitat destruction, trampling by grazers and off-road vehicles, conversion of high pineland and scrub for agricultural purposes (principally citrus groves), and for commercial, residential, and recreational purposes, m

Dorothy M. Brazis
  • 01/01/2010

Only 15 populations remain with fewer than 1000 plants (FNAI 2000). Most of the populations are on private land. It is found at 10 sites on the Mt. Dora Ridge in Orange and 6 sites on the Winter Haven Ridge in Polk County (FNAI 2000). In 1986, the total population was estimated to be fewer than 350 plants in 11 current populations.

Dorothy M. Brazis
  • 01/01/2010

Jack Stout of University of Central Florida monitors this species. Charba has been studying populations in Orange County by examining dead plants and by culturing parasites found on these plants.

Dorothy M. Brazis
  • 01/01/2010

No active management known to be in progress.

Dorothy M. Brazis
  • 01/01/2010

Determine current distribution. Protect and enhance existing populations. Monitor existing populations of L. aridorum. Educate the public. Prevent degradation of existing habitat. Restore areas to suitable habitat. Conduct habitat-level research projects. Monitor habitat/ecological processes. Germination and propagation techniques and soil seedbank studies.

Dorothy M. Brazis
  • 01/01/2010

Conduct research on life history characteristics. Maintain plants in ex situ collections.

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Photos
Nomenclature
Taxon Lupinus westianus var. aridorum
Authority (McFarlin ex Beckner) Isely
Family Fabaceae
CPC Number 2693
ITIS 202474
USDA LUWEA
Common Names scrub lupine
Associated Scientific Names Lupinus aridorum | Lupinus westianus var. aridorum
Distribution Lupinus aridorum is endemic to Polk, Orange, and Oceola Counties in central Florida where it occurs on the Mt. Dora Ridge in Orange and on the Winter Haven Ridge in Polk County (FNAI 2000). It is unu
State Rank
State State Rank
Florida S1
Habitat

The species is found in sand pine or rosemary scrub where it grows in both white and yellow sand of the Lakeland or St. Lucie series. Historically, Lupinus aridorum probably grew in scrub gaps until fire suppression and other lack of disturbance resulted in excessive shading and gap closure.

Ecological Relationships

No ecological associations known.

Pollinators
Common Name Name in Text Association Type Source InteractionID
Bees
Bumble bees Bumblebees Confirmed Pollinator Link
Honey bees Honeybees Confirmed Pollinator Link

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