Monographs Details: Costus guanaiensis Rusby var. guanaiensis
Maas, Paulus J. M. 1972. Costoideae (Zingiberaceae). Fl. Neotrop. Monogr. 8: 1-140. (Published by NYBG Press
Synonyms:Costus guanaiensis var. asplundii Maas, Costus sinningiiflorus Rusby, Costus bracteatus Rowlee
Description:Description - Sheaths densely ferrugineous-hirsute or strigose. Upper side of leaves ferrugineous-strigose to hirsute, or glabrous, lower side rather densely (ferrugineous-) villose. Inflorescence on a leafy stem, or on a leafless shoot to 50 cm tall. Bracts densely (ferrugineous-) strigose to glabrous. Pollen size 84-116 µ. Exine 2-3 µ thick. Number of pores 7-9. Porus diam 12-22 µ (Cardenas 1851 from Bolivia).
Discussion:The typical var guanaiensis can be recognized by its hirsute indument on all vegetative parts; the atypical form, however, (including the type of var guanaiensis) is somewhat aberrant by its glabrous upper side of the leaves.I do not feel quite sure about the identity of C. bracteatus, but Rowlee’s description and table agree so well with var guanaiensis, that it seems best to place it here.
Distribution:Colombia South America
| Caquetá Colombia South America
| Peru South America
| Ayacucho Peru South America
| Huánuco Peru South America
| Loreto Peru South America
| San Martín Peru South America
| Bolivia South America
| La Paz Bolivia South America