North American species of columbine
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Aquilegia chrysantha, the golden columbine, is a perennial herbaceous flowering plant native to the southwestern United States and northwestern Mexico. The plant, with a height of between and , has yellow flowers. "A. chrysantha". as with other members of the "Aquilegia coerulea" species complex, is evolved for pollination by hawkmoth. It favors moist environments in its mountainous range.
In gardens, a cultivar of the species known as 'Yellow Queen' is known for its appearance and won the Royal Horticultural Society's Award of Garden Merit. Hybrids utilizing "A. chrysantha", particularly those with "Aquilegia coerulea", are especially popular. Both wild and cultivated "A. chrysantha", known for their large flowers, require moist and well-drained soil.
Description.
The ferny leaves have three leaflets with three lobes and grow from the base and off the flowering stems. The flowers grow on a long stem above the leaves and have five pointed yellow sepals and five yellow petals with long spurs of around projecting backwards between the sepals. Its sepals of to can be spreading, lanceolate, or somewhat oval. At the center of the flower are many yellow stamens. The height of the plant's flowering stems range from to tall. Flowers are golden yellow.
At the earliest, the plant achieves maturity in two years under cultivation. It is polycarpic, dropping seeds several times during its lifespan, which is longer than other "Aquilegia" species. Breeding is performed through its unisexual flowers, meaning that individual flowers exclusively possess either stamen or carpels, making it monoecious. "A. chrysantha" is similar to the also yellow "Aquilegia flavescens" but the former is more resistant to droughts and blooms longer. Pollination is primarily performed by moths, butterflies, and bees. Blooming occurs April and September, with a peak varying between late spring and late summer.
The plant needs moist, well-drained areas to succeed. Poor drainage can cause the root crown to rot. Excessive heat increases the plant's risk to aphids and spider mites. Overly warm periods can result in the plant going dormant.
In the variety "hinckleyana", leaves grow into two parts and pedal blades range between only long and wide. In wild specimens observed in southern Arizona during May and June 1980, plants generally exhibited a faint scent. One plant observed during that period was found with the same pattern of pink sepals and spurs with yellow pedals as found in certain "Aquilegia micrantha" populations of Colorado and Utah.
Taxonomy.
"Aquilegia chrysantha" is part of the "Aquilegia coerulea" species complex adapted for hawkmoth pollination. Both species are native to the western United States and evolved to have longer nectar spurs than those on eastern U.S. hummingbird-pollinated species as hawkmoths have longer tongues than hummingbirds. "A. chrysantha" belongs to a likely monophyletic group with the other North American columbine species, which diverged from their closest relatives in East Asia in the mid-Pliocene around 3.8 million years ago. North of the Grand Canyon, "A. chrysantha" intergrades with "A coerulea" var. "pinetorum". In Texas, "A. chrysantha" intergrades with "Aquilegia longissima".
The species was first assigned the binomial nomenclature "Aquilegia chrysantha" in 1873. Its type locality is in the Organ Mountains of New Mexico. 
The closely related "Aquilegia chaplinei" is considered a dwarf version of "A. chrysantha" that is better suited to arid environments. In 1985, Emily J. Lott proposed reclassifying "A. chaplinei" as "Aquilegia chrysantha" var. "chaplinei" in the journal "Phytologia". Lott's proposal came out of her study of plants in the Chihuahuan Desert, stemming from her 1979 unpublished master's thesis on "Aquilegia" in the Trans-Pecos region of Texas. The name proposed by Lott was not broadly accepted outside of Texas, where it is used by the Lady Bird Johnson Wildflower Center of the University of Texas at Austin.
The nectar spurs present "Aquilegia" species are an unusual evolutionary trait. The genus has radiated widely since its relatively recent origin. In order to determine the gene responsible for the trait, a 2020 paper by researchers from the University of California, Santa Barbara, Harvard University, and Stanford University utilized "A. chrysantha" (alongside "A. coerulea", "Aquilegia formosa", and "Aquilegia sibirica") as a spurred "Aquilegia" taxa to compare against the sole spurless "Aquilegia" species, "Aquilegia ecalcarata". This research identified a gene named "POPVICH" ("POP") as responsible for cell proliferation during the early stage of spur development. "POP" appeared at higher levels in the pedals of the spurred "Aquilegia" studied than those of the spurless "A. ecalcarata".
Etymology.
The word "columbine" derives from the Latin word "columbinus", meaning "dove", a reference to the flowers' appearance of a group of doves. The genus name "Aquilegia" comes from the Latin word for "eagle", "aquila", in reference to the pedals' resemblance to eagle talons. The specific epithet "chrysantha" is Latin for "golden-flowered".
Distribution and habitat.
The species is native to the southwestern United States from extreme southern Utah to Texas, including Arizona, Colorado, and New Mexico, and to Sonora, Chihuahua, Coahuila, and Nuevo Leon in northwestern Mexico. It grows in moist habitats in mountainous regions. The plant's native elevation range is between and above sea level.
The population of "A. chrysantha" in south-central Colorado is unusually disjunct from the rest of the species's range. This population usually possess smaller flowers. They have sepals extending only to long and spurs only to long. This population is sometimes recognized as a separate variety, "A. chrysantha" var. "rydbergii", but this distinction is not recognized in the "Flora of North America".
In 1881, botanist Thomas Meehan noted the apparent proliferation of "A. chysantha" in the Colorado Springs area, particularly around Cheyenne Cañon and Glen Eyrie, since botanists had examined the area in 1871 and 1873. Meehan theorized that their rapid spread was partially due to the increased human habitation of the area altering environmental circumstance.
A population of columbines from the Baboquivari Mountains of southern Arizona has been the subject debate regarding its speciation. While occasionally described as a variety of "A. chrysantha", its has also been classified part of the species "A. longissima".
Cultivation.
"A. chrysantha" succeeds well in a variety of soils when provided adequate moisture, drainage, and shade. It is recognized for its large flowers, is the parent to a number of garden hybrids. Some, such as the white 'Alba', were given pseudo-botanical names in the 19th century. The cultivar 'Yellow Queen' has gained the Royal Horticultural Society's Award of Garden Merit. Often sold as "A. chrysantha", Yellow Queen is recognized for its massive yellow flowers and long life. Yellow Queen plants prefer moist, well-drained soil of clay, sand, or loam. Flowers bloom May and June in the northern hemisphere, with darker yellow center pedals.
Crosses "A. coerulea" and "A. chrysantha" – and possibly "A. formosa" for the addition of red – are considered the most valuable hybrids. Showing characteristics of both species, they possess relatively short lifespans. Seed availability of these plants is relatively high in North America. "Aquilegia" x "jaeschkanii", thought to be a cross between "A. chrysantha" and "Aquilegia skinneri", is a less valued hybrid.
In 1916, botanist Theodore D. A. Cockerell described an F1 hybrid that his wife, Wilmatte P. Cockerell, had made between "A. chrysantha" and "Aquilegia desertorum". He observed that the coloration and time of flowering were both indeterminate. The flowers of F1 "A. desertorum" x "chrysantha", though less reminiscent of the parent species and more characteristic of species in the "Aquilegia vulgaris" group, had a width more typical of "A. chrysantha". He also noted the longstanding presence of "A. chrysantha"x"A. coerulea" hybrids in gardens; this hybrid's flowers are paler than "A. coerulea" with yellow coloring.
Seeds from the Baboquivari population have been collected and privately cultivated.
Ecology.
"Aquilegia chrysantha" flowers in May and early June. It is chiefly pollinated by the hawkmoth species "Eumorpha achemon", the Achemon sphinx moth, and also by moths of the "Sphinx" genus. It is occasionally visited by large bees and hummingbirds.
Conservation.
As of October 2024[ [update]], NatureServe did not give a worldwide or United States-wide conservation status for "A. chrysantha". In individual states, it is listed as Critically Imperiled (S1) in Utah, Imperiled (S2) in Colorado and Nevada, Vulnerable (S3) in Arizona and New Mexico, and is given no status rank (SNR) in Texas.
References.
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