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Flowers are salverform with a narrow tube that typically restricts nectar access to long-tongued insects (e.
Like Abronia, Tripterocalyx produces umbellate inflorescences of salverform flowers with a showy limb and a narrow tube, which indicates that lepidopterans are likely pollinators.
Good things come to those who wait, and the key to producing the large salverform blooms, is to grow them under the greenhouse staging during the summer.