Rocky Mountain National Park is home to a multitude of wildflowers, from tiny alpine blooms to the large cow parsnip which can grow to five feet tall in moist meadows. Although diverse in size and appearance, wildflowers share a common purpose – they are the reproductive structures of plants. Pollen from a flower's anther needs to reach the flower's pistil to fertilize its eggs and create seeds for the next generation. The methods plants employ to accomplish this vary and can be quite spectacular.
One of the simplest approaches is for the wildflower to self-pollinate. However, this does not allow for genetic diversity. Most flowers promote cross-pollination by attracting an animal to help transfer their pollen to neighboring plants. Many flowering plants have evolved complex adaptations – advertisements, bribes and tricks – to encourage pollination by animals.
NPS photo by C. Johnson
Perhaps one of the most interesting elements of wildflowers is the wide array of colors used to appeal to pollinators. Red, orange, and yellow flowers attract butterflies, while blue, purple, yellow and white flowers appeal to bees. Hummingbirds favor the color red. Some flowers have colors in the ultraviolet spectrum which are invisible to humans but are highly attractive to bees.
NPS photo by A. Schonlau
The diversity of flower shapes also attracts certain pollinators and enables them to pick up and deliver pollen. Wide open, radially symmetrical flowers such as buttercups and sunflowers allow easy access to many insects from beetles to butterflies while bilaterally symmetrical flowers such as monkshood appeal to bees who like to wiggle up inside enclosing petals. Some flowers such as elephantella use tricks such as trigger mechanisms that shoot pollen on an insect when it lands on specialized petals. Long tubular flowers such as scarlet gilia favor pollination by hummingbirds whose long tongues are able to reach the nectar hidden deep inside.
Animals are an effective way to transfer pollen, from bumblebees and hummingbirds to a moose calf lying in flowers and carrying pollen in its fur. The relationship between animals and flowers is intricate and astounding, and one that has contributed to the great diversity of life in Rocky Mountain National Park.