On Hydrangea peruviana, an endangered species from Ecuador, and Hydrangea oerstedii, very common in Costa Rica and Panama, and seven threatened Central and South American Hydrangeas, which have been confounded with these

Hydrangea oerstedii A branch with leaves seen abaxially B flowering branch of functionally male plant with three inflorescences with enlarged marginal flowers and many flowers with large stamens C inflorescence of functionally male plant with enlarged marginal flowers, most flowers in bud with petals visible, and a few open flowers with long stamens D close-up of functionally male inflorescence E close-up of functionally male flowers with reduced pistils F close-up of functionally female flowers with reduced stamens and large pistils. A field image of collection Samain & Martínez 2012-044 B field image of collection Samain & Martínez 2013-025 C field image of collection Samain & Martínez 2012-044 D field image of collection Samain et al. 2019-003 E field image of collection Samain & Martínez 2013-025 F field image of collection Samain & Martínez 2013-021.