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Senna mexicana (Jacq.) Irwin & Barneby var. chapmanii (Isely) Irwin & Barneby

Cassia chapmanii Isely

Chapman’s wild sensitive plant, Bahama cassia

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassRosidaeRoses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more
OrderFabalesLegumes (pea and bean families)
FamilyFabaceaeLegume family (peas and beans)
GenusSennaFrom the Arabic name Sana
SpeciesmexicanaOf or from Mexico
var.chapmaniiFor Alvan Wentworth Chapman (1809–99), American physician and pioneering botanist in the study of flora of the American Southeast

About plant names...

Chapman’s wild sensitive plant is native to Miami-Dade County Florida, and the Florida Keys. It is found in pinelands, hammocks, and dunes, in calcarous, sandy, or loamy soils. It is considered a threatened species, due to its limited range.

Plants: Plants reach 3-9' (91-274 cm) in height, producing rounded clumps, with multiple stems.

Leaves: Leaves are even pinnate and alternate. Leaflets are linear to elliptic, and less than 2" (5 cm) long. A gland at the base of each leaflet attracts ants that attack marauding caterpillars, as described in an article in The Florida Entomologist.

Flowers: Flowers are yellow, ½-1" (1.3-2.5 cm) around, with five petals.

Fruits: Shaped like beans, 3-6" (7.6-15 cm) long and about ¼" (6.3 mm) in diameter. They turn brown and persist in the winter.

Online References:

Senna mexicana var. chapmanii on flawildflowers.org

Senna mexicana var. chapmanii at the University of Florida Institute of Food and Agricultural Sciences

Senna mexicana var. chapmanii on florida.plantatlas.usf.edu

Senna mexicana var. chapmanii on florida.plantatlas.usf.edu

Senna mexicana (Chapman’s wild sensitive plant, Bahama cassia)

4/14/2015 · Pinelands, Everglades National Park, FL
≈ 8 × 11" (21 × 27 cm)

Senna mexicana (Chapman’s wild sensitive plant, Bahama cassia)

4/12/2015 · Shark Valley, Everglades National Park, FL
≈ 6 × 6" (16 × 14 cm)

Senna mexicana var. chapmanii description by Thomas H. Kent, last updated 7 Sep 2020.

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Senna mexicana (Chapman’s wild sensitive plant, Bahama cassia)

4/12/2015 · Shark Valley, Everglades National Park, FL
≈ 8 × 7" (19 × 16 cm)

Senna mexicana (Chapman’s wild sensitive plant, Bahama cassia)

4/14/2015 · Pinelands, Everglades National Park, FL
≈ 7 × 9" (18 × 22 cm)

Senna mexicana (Chapman’s wild sensitive plant, Bahama cassia)

4/14/2015 · Pinelands, Everglades National Park, FL
≈ 7 × 4½" (17 × 11 cm)

Senna mexicana (Chapman’s wild sensitive plant, Bahama cassia)

4/12/2015 · Shark Valley, Everglades National Park, FL
≈ 5 × 5" (13 × 13 cm)

Range: Zones 10a-11:

About this map...