Bill Evans' I. calycina Benth. Ecuador I. coccinea Scheidw. A form with large, many-flowered clusters at branch ends, likely more darker blue in color than I. lanceolatum . Foliage as with I. lanceolatum , and perhaps the same as that species. I. lanceolatum Miers.
Foliage is covered with a fine, light tomentum, making the leaves somewhat soft to the touch.
I. macrocalyx synonym for I. calycinum I. tubulosum Benth. Colombia Deep blue tubular flowers with a slightly inflated calyx. I. umbrosa Miers. A Scarlet-red flowered species with flowers borne a few at a time on a plant more similar to I. lanceolatum . I. cyaneum I. warscewiczii Regel.