Scarlet Gilia (Ipomopsis aggregata) is one of the most vivid and unmistakable wildflowers of the American West — a slender, elegant plant crowned with brilliant scarlet-red trumpets that seem designed by nature specifically to catch the eye of hovering hummingbirds. In fact, the co-evolution between this flower and its hummingbird pollinators is so precise that the long, tubular corolla is perfectly shaped to exclude all other pollinators, reserving its nectar exclusively for the hovering birds that can most efficiently transfer its pollen from plant to plant across the mountain meadows.
• One of the most spectacular hummingbird-pollinated wildflowers in western North America
• The tubular red flowers are perfectly shaped to exclude bees and butterflies, reserving nectar for hummingbirds
• Also called "Skyrocket" for the fireworks-like appearance of the tall flower spikes
• The genus name Ipomopsis means "resembling Ipomoea" (morning glory), referring to the trumpet-shaped flowers
• Individual plants are monocarpic — they flower once and then die, but may live 2 to 8 years as a leaf rosette before flowering
• Plants that survive longer as rosettes produce dramatically more flowers when they finally bloom
• Found from southern British Columbia and Alberta southward through the Rocky Mountain states to Arizona, New Mexico, and Baja California
• Also occurs in the Sierra Nevada, the Cascades, and the Great Basin
• Most abundant in montane and subalpine meadows, forest openings, and along roadsides at 1,000 to 3,500 m elevation
• Grows in dry, open, sunny habitats including sagebrush, ponderosa pine, and aspen communities
• First described by Pursh in 1813 as Cantua aggregata, later transferred to Ipomopsis
• The genus Ipomopsis contains approximately 25 to 30 species, all native to North America
Basal rosette (vegetative stage):
• Persistent for 2 to 8 years before flowering
• Leaves pinnately divided into narrow, linear segments
• Greyish-green, finely hairy
Stem:
• Erect, slender, branching above, green to reddish, finely hairy
• Bears the terminal flower clusters
Leaves:
• Alternate, pinnately divided into narrow, linear lobes
• Decreasing in size upward
Flower:
• Loose, terminal clusters of 10 to 50+ flowers
• Each flower a long, tubular trumpet, 2 to 4 cm long
• Corolla scarlet-red to orange-red, rarely pink or white
• 5 shallow, rounded lobes at the mouth
• Stamens and stigma exserted from the tube
• Blooms June through September
Fruit:
• Small capsule, 5 to 8 mm long, containing numerous tiny seeds
• Found in montane and subalpine meadows, forest clearings, roadsides, and dry, open slopes
• Requires full sun and well-drained, dry to mesic soils
• Almost exclusively hummingbird-pollinated — the long, narrow tube and exserted stamens are precisely adapted to match the hummingbird's bill and head shape
• The vivid red color is maximally visible to hummingbirds but poorly perceived by bees (which see red as black)
• Individual plants may produce up to 100+ flowers in their single reproductive episode
• The monocarpic lifestyle means the plant invests everything in one massive reproductive event
• Seeds require cold stratification to germinate
• Associates with Indian paintbrush, lupines, and columbine in subalpine meadow communities
• Important nectar source for migrating Rufous Hummingbirds in late summer
• Requires full sun and excellent drainage — will not tolerate wet feet or high humidity
• Best in lean, gravelly, or sandy loam soils — avoid rich or heavily amended soils
• Sow seeds in fall for natural cold stratification, or stratify in the refrigerator for 30 to 60 days
• Plants spend several years as a low rosette before sending up their spectacular flower spike
• Do not overwater — this is a drought-adapted species
• Excellent for rock gardens, xeric landscapes, and native western plantings
• The flower spike is breathtaking in bloom but the plant will die afterward
• Allow plants to self-seed to maintain a population
• Hardy to USDA Zone 4
재미있는 사실
Scarlet Gilia has one of the most dramatic life strategies of any wildflower. A single plant may persist as a modest, ground-hugging leaf rosette for up to 8 years, quietly storing energy from photosynthesis in its taproot. Then, in its final year, it sends up a spectacular flower spike up to 1 meter tall bearing as many as 150 brilliant red trumpets — investing every last ounce of stored energy into a single, massive reproductive display. After the seeds mature, the entire plant dies. The timing of this suicidal flowering is influenced by environmental conditions: plants growing at higher elevations or in harsher sites tend to live longer before flowering, while those in favorable sites bloom younger. This means that the most spectacular Scarlet Gilia displays — plants with over 100 flowers — are produced by plants that have survived the longest under the most challenging conditions.
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