Unraveling the Mystery of the Creeping Bluestar

Target Species: Creeping Bluestar (Amsonia repens)

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Amsonia repens in a remnant coastal prairie

Admittedly, I didn’t know much about Amsonia repens when I put it on my 2017 list of biodiversity goals.  I knew that it was an showy wildflower that was endemic to the West Gulf Coastal Plain.  This alone piqued my interest and prompted me to make it a target species.

What I found, however, was a general lack of information on the species.  I struggled to find a good reference with information on how to differentiate it from the very similar A. tabernaemontana.  I was able to track down some historic locations, however not feeling comfortable in my ability to identify it, I failed to pursue it with much enthusiasm.  I stopped at a couple of sites in 2017 where a friend had reported some a few years prior but found nothing.  After that, the species went on the back burner while I pursued other more easily researched species on the list.

What drew me to the Creeping Bluestar was its range, which is almost entirely confined to the eastern third of Texas.  I have always had a strong interest in species endemic to the West Gulf Coastal Plain, which includes East Texas, western Louisiana, and extreme southeastern Oklahoma and southwestern Arkansas.  There are a number of species that are restricted in range to this area, and this distributional pattern has long fascinated me.

County level distribution for Amsonia repens

My interest in pursuing Amsonia repens was renewed after I photographed some Amsonia plants in bloom in remnant prairie and marsh patches in Fort Bend and Brazos County this spring.  I tried once again to do some research and came across a paper that was published in March of 2019: Taxonomy of the Amsonia tabernaemontana complex (Apocynaceae:Rauvolfioidae) by J K Williams from Sam Houston State.  Though this paper proposes that A. repens be considered a variety of A. tabernaemontana, it provides the best treatment I have seen on differentiating A. repens from other similarly structured congeners.

In a nutshell, A. repens (or A. tabernaemontana var. repens) is best differentiated from A. tabenaemontana by having tomentose (hairy) calyces, a feature which can be seen in the image below.

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Amsonia repens

Interestingly, after reading this paper and reviewing other taxonomic keys, I went back to examine some photos of Amsonia that I took in Montgomery County a few years ago and found that they too were A. repens.  It had been hiding under my nose this whole time!

Spring in the Desert Part 3: The Marathon Basin

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An hour or so north of Big Bend National Park, nestled between the Stockton Plateau and the Eastern Front Ranges of the Trans-Pecos lies a unique geoecological area with floral and faunal associations that seem out of place in the otherwise semi-arid desert scrub that surrounds it.  The Marathon Basin, at is is commonly described, is surrounded by a series northeast trending ridges known as the Marathon Uplift, which contains a unique geology important to a suite of endemic, endangered species.

The Basin’s most dramatic feature just might be a vast remnant patch of short grass prairie that appears like a vast sea of refuge from the surrounding desert scrub.   I always look forward to seeing this prairie and its residents.  This spring we were fortunate to see a group of Pronghorn (Antilocapra americana) among the undulating grassy ridges.

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Pronghorn Buck

The star attraction of the Marathon Grasslands, however, is the massive prairie dog town.  Here a thriving colony of Black-tailed Prairie Dogs (Cynomys ludovicianus) entertains visitors to their prairie realm with their inquisitive nature, comical antics, and high-pitched alarm calls.

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Black-tailed Prairie Dog

South of the town of Marathon exist a series of ridges with conspicuous exposed layers of multi-colored rock known as Caballos Novaculite.  Primarily composed of chert, this formation is the same as the Novaculite outcrops in the Ouachita Mountains of Oklahoma and Arkansas, located hundreds of miles to the east, and both exposures originated from a collision of the land masses Gondwana and Laurentia in the Late Paleozoic.  The quartz present in the Caballos makes the rocks extremely hard and often sharp.

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Caballos Novaculite Outcrops

The Caballos Novaculite is home to three species of endemic cacti, all of which are entirely confined to this small portion of Brewster County.  Two of these species, Nellie’s Cory Cactus (Escobaria minima) and Davis Hedgehog Cactus (Echinocereus davisii) are Federally Endangered.  Both species have suffered heavily from over collection and as a result are now entirely confined to private land.

We were fortunate enough to observe several Echinocereus davisii plants in bloom.  This is one of the smallest cactus species in the world, rarely reaching heights greater than an in and a half.  They are almost entirely hidden beneath grasses and other vegetation growing among the Novaculite, rendering them practically invisible.  Only when the small yellow-green flowers emerge in early Spring to they become visible.

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Davis Hedgehog Cactus

The Marathon Basin and Uplift are bordered to the northwest by the Glass Mountains.  The lower slopes of this range are dominated by typical Chihuahuan Desert Scrub, where we observed a number of interesting plants in bloom, including Woolly Locoweed (Astragalus mollissimus), Feathery Dalea (Dalea formosa), and Downy Paintbrush (Castilleja sessiliflora).

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Woolly Locoweed

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Feathery Dalea

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Downy Paintbrush

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Downy Paintbrush

In my humble opinion, no trip to the Big Bend Region is complete without a stop in the Marathon Basin.  It serves as a reminder of the staggering diversity of the Trans-Pecos, and a humbling exposure to the wide open spaces that West Texas is famous for.

One Perfect Spring Day

One perfect spring day, Carolina came to me and said that she wanted to go looking for dogwoods.  She had a spot in mind, near the western edge of the Pineywoods.  My response, unsurprisingly, was an eager “let’s go!”.  So we set out into the woods, and what we found was a beautiful spring paradise beyond anything I could have expected.  Seeing Flowering Dogwood, with its blossom laden branches painting the forest understory in white, is reward enough for a day’s wanderings.  But the dogwoods were just a precursor to the botanical, entomological, and mycological treasures to be discovered.

Deep in the forest we came across a gentle slope in the mesic floodplain of a small stream.  My attention was immediately captured by a sea of Mayapple (Podophyllum peltatum) leaves.  Scattered Golden Groundsel (Packera obovata) blooms rose from beneath the surface, adding a splash of yellow to the forest floor.  It was a beautiful scene for certain.

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Vernal Forest

But the true treasures of this forest were revealed on closer examination.  Carolina spotted the leaves of White Trout Lily (Erythronium albidum), and Solomon’s Seal (Polygonatum biflorum), scattered low to the ground.  Both species are quite rare in Texas.  Moving further upslope, I began noticing more interesting blooms, including scattered colonies of Ozark Milkvetch (Astragalus distortus), Violet Woodsorrel (Oxalis violacea), and Lousewort (Pedicularis canadensis), also known as Wood Betony.

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Ozark Milkvetch

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Violet Woodsorrel

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Lousewort

On the slopes drier upper reaches I encountered a couple of species that are much more common further west, where chalky, calcium rich soils are more common.  There were several Prairie Celestials (Nemastylis geminimflora) blooming alongside Nuttall’s Death Camas, which was still in tight bud.

Though it superficially resemble a lily, and is often called the “Celestial Lily”, Nemastylis geminiflora is, in fact, a member of the Iris family.  They thrive on calcium rich soils, and as the soils of the Pineywoods are generally acidic, they are seldom encountered here.  Finding them alongside the calciphilic Toxicoscordion nuttallii, communicated to me that we were dealing with a calcareous forest, and that other interesting things were likely near.

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Prairie Celestial

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Prairie Celestial

While I was admiring some blooming thing, Caro called out that she had found what is, in my opinion, a serious contender for the most beautiful animal in the country: the Luna Moth (Actias luna).  Seeing one of these massive silkworm moths in the wild is an experience not easily forgotten, and each encounter leaves me awestruck.  This striking male had clearly just emerged from its pupa, where it overwintered hidden among the leaf litter at the base of a large shortleaf pine.

It was a male, as evidenced by its large, feathery antennae.  It was no doubt awaiting nightfall, when it would take to the air in search of a female’s pheromone trail.  The females advertise their location using these chemical cues, and males will fly all night to find them.  It seems a tragic tale, as both sexes are born without feeding mouth parts, and live only for a week or so.  Their only purpose is to find a mate so that they may parent the next generation of Luna Moths.

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Luna Moth

When I had my lens trained on a different flower, Carolina called out that she had found an interesting fungus.  And she had.  I had heard that the elusive holy grail of fungi could be found in East Texas, but in nearly two decades of wandering I had never seen one.  That all changed this day.  Caro had found a Pineywoods morel.  More specifically, a Yellow Morel (Morchella esculenta).

Morels may be THE most sought after wild edible in the country.  Though common in some areas, they seem quite scarce in East Texas.  I had long dreamed of finding and photographing one, but the possibility hadn’t crossed my mind as we set out that morning.  These mushrooms are renowned for their rich flavor, and there is no way of knowing how many thousands of pounds are harvested each year.  It is said that this harvest is not harmful to the plant, as only the above ground reproductive structure of the organism is removed.  This is true in a sense, however removing them prior to the release of spores can still impact local populations.  Due to their unique beauty and scarcity in the region, I could not bring myself to pick any, and after capturing their likeness , I left them to the forest.

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Yellow Morel

After returning from an incredible day, Caro drafted a narrative of the mushrooms’ discovery which sums up a common interaction in such situations.  I share it here, as a tribute to one perfect spring day.

Loving the idea of helping him because it means he needs me I always keep my eyes wide open to any opportunity. I have good sight, but those were hard to recognize because they look similar to the leaves on the ground. Suddenly, I could recognize them; they were those fungi that he loves. I start to talk to him, well, interrupting him from the shooting. Like any other husband in this world, he starts to sound interrupted and makes noises right before the question: what is it?! After, breaking the special connection man-plant I could explain myself, but still wife-annoyed and mumbling secret words to the universe he knelt and asked again: what is it? But this time with a resigning attitude and makes an effort to not rise the voice, so I couldn’t detect the obvious and by using husband-diplomacy; he said “what?”. It took me a moment to make him understand what I was talking about and even longer to show the respective subjects. Then, he jumped and started to claim this species was something he always wanted to see and take photos, so the mystic connection moment restarted again.
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Yellow Morels