Bloom Report: Summer Wildflowers — Strange, Surprising and Just Plain Cool!

by Jeff Norcini
Pictured above: Purple passionflower (Passiflora incarnata) by Emily Bell

Florida’s wildflowers don’t always follow the rules. Some pretend to be something else, others bloom without obvious flowers, and a few are just sucking the life out of their neighbors — literally! Here are some fun, weird and wonderful facts about Florida’s quirkiest summer bloomers.

That Looks Like Marijuana

Scarlet hibiscus (Hibiscus coccineus) has foliage that strongly resembles that of marijuana. While it’s a wetland species, it typically does well in any good garden soil — as long as the soil does not dry out.

Scarlet hibiscus flower.
The brilliant red bloom of Scarlet hibiscus. Photo by Emily Bell
Scarlet hibiscus leaf.
In the absence of blooms, Scarlet hibiscus strongly resembles marijuana with these deeply lobed leaves. Photo by Emily Bell

The Flowers Aren’t the Showy Part

For some native wildflowers, the real show isn’t in the flowers at all — it’s in the bracts, just like poinsettia. Spotted beebalm (Monarda punctata) has striking whitish-purple to purple bracts beneath its much smaller honey-colored flowers. Two common wetland species, Starrush whitetop (Rhynchospora colorata) and Giant whitetop (Rhynchospora latifolia), feature large white bracts tipped in green beneath their tiny white to cream-colored flowers.

Carpenter bee on Spotted beebalm.
Beneath those beautiful purple bracts on Spotted beebalm are the inconspicuous tubular flowers that feed the bees. Photo by Emily Bell
Check out those striking white bracts on the Giant whitetop (Rhynchospora latifolia).
Photo by Gil Nelson

Seeds That Float

Have you ever tried collecting milkweed seeds? It can be difficult — and frustrating — thanks to the fluffy, hair-like pappus attached to each seed. Not so with Swamp milkweed (Asclepias perennis). This wetland species has adapted to its habitat by ditching the fluff and developing seeds that float on water instead.

Swamp milkweed seed.
Swamp milkweed (Asclepias perennis) seeds lack the pappus of their relatives.
Photo by Christopher David Benda
Pinewoods milkweed seeds with fluffy white pappus.
Pinewoods milkweed (Asclepias humistrata) seeds with fluffy white pappus.
Photo by Emily Bell

And Then There Was One

Lanceleaf blanketflower (Gaillardia aestivalis) is now the only Gaillardia species considered native to Florida. Recent research revealed that the widespread and popular Blanketflower (Gaillardia pulchella) is actually not native to Florida.

Lanceleaf blanketflower bloom.
Lanceleaf blanketflower (Gaillardia aestivalis). Photo by Emily Bell

The Goo Suppresses Germination

Purple passionflower (Passiflora incarnata), a host plant for Gulf fritillary (Papilio vanillae) and Zebra longwing (Heliconius charithonia) butterflies, is easy to grow from seed. But first, you’ll need to remove the gelatinous coating (the “goo”) that surrounds the seeds inside the fruit — it can inhibit germination

Seeds inside an open Purple passionflower fruit.
Seeds inside an open Purple passionflower (Passiflora incarnata) fruit. Photo by Betsy Harris

A Self-Fertilizing Plant

Sunshine mimosa (Mimosa strigillosa), which continues blooming into summer, can produce its own nitrogen — one of the three essential nutrients needed for plant growth. It does this through a process called nitrogen fixation, in which bacteria living in its root nodules converts atmospheric nitrogen into a plant-usable form.

Sunshine mimosa is larval host for the Ceraunus blue butterfly.
Sunshine mimosa (Mimosa strigillosa).
Photo by Lisa Roberts

Cool-Looking Fruit

Species in the Meadowbeauty (Rhexia) genus produce a unique fruit that is shaped like a miniature vase. Not only are they ornamental, but this distinctive fruit makes it a good characteristic for identification.

Savannah meadowbeauty (Rhexia alifanus). Photo by Emily Bell

It’s Not Moss!

You probably know that Spanish Moss (Tillandsia usneoides) isn’t a moss. But did you know it produces tiny, inconspicuous flowers in the summer? Or that it’s a relative of the pineapple? Both are members of the Bromeliaceae or bromeliad family. And no, Spanish moss does not kill trees — it just tends to thrive in trees that are in decline where the canopy has opened up to allow more light.

Close-up of a Spanish moss flower.
Spanish Moss (Tillandsia usneoides) in flower. Photo by Betsy Harris

Juice Sucker

“Juice sucker” might best describe a power-hungry appliance — but the term also fittingly describes Dodder (Cuscuta spp.)*, a parasitic wildflower with small, yellowish to whitish blooms. Lacking roots and chlorophyll, Dodder cannot produce its own food; instead, it wraps around host plants to siphon off water and nutrients — literally sucking the “juice” out of them. It’s easy to recognize: look for its telltale tangle of yellow-orang string-like stems draped across other vegetation. Most Dodders that occur in Florida are native.

Close-up of a Fiveangled dodder plant with thin yellow-orange stems and clusters of small white flowers growing on green vegetation.
Fiveangled dodder (Cuscuta pentagona).
Photo by Alan Cressler

Florida’s wildflowers are full of clever tricks and surprising stories. Want to discover more? Explore our website for more plant profiles and wildflower stories, or join us on an upcoming field trip!